首页 > 最新文献

Journal of Petrology最新文献

英文 中文
Estimates of Crystallinity utilizing Differential Scanning Calorimetry: Application to the Kīlauea 2018 lower East Rift Zone Eruption 利用差示扫描量热法估算结晶度:应用于基劳埃阿火山 2018 年东部下断裂带喷发
IF 3.9 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS Pub Date : 2024-02-02 DOI: 10.1093/petrology/egae010
B A Halverson, A Emerson, J Hammer, J Lira, A Whittington
Rocks produced by diverse processes, from condensation in space to impacts on planetary surfaces to volcanism, contain both crystals and amorphous material. Crystallinity provides information on the thermal history of the sample and is especially important in characterizing volcanic rocks and pyroclasts because lava rheology is profoundly influenced by the crystal content. Crystallinity is typically quantified via microscopy, using transmitted light or backscattered electrons. However, many samples present visibly ambiguous textures such as intimate intergrowth of crystal phases, and/or crystal sizes extending down to the nanometer scale. Here we apply calorimetric methods involving heat capacity and enthalpy to assess the crystallinity of a series of volcanic samples. We tested three different approaches, using differential scanning calorimetry, on 30-40 mg aliquots of powdered basalts from the 2018 Kīlauea lower East Rift Zone. The first approach involves determining the magnitude of the increase in heat capacity at the glass transition , which can determine crystallinity to a 1𝜎 precision of ±3%. The second approach is based on the enthalpy of fusion, which requires a longer more complex procedure with results that are typically more uncertain than for the heat capacity method, with a 1𝜎 of ±6%. A final method utilizing differences in enthalpies calculated from the heat capacities required the most complex procedure, and has the greatest uncertainty of ±18%. Preliminary results for lavas with microscopically determined crystallinities ranging from 11-98% indicate that crystallinity based on calorimetric data can be tens of percent higher than the average value identified using microscopy and petrographic analysis. Image-based methodologies applied to sections of samples reveal spatial heterogeneity and details in texture and crystallinity, whereas calorimetry-based methodologies capture the overall "bulk sample" properties, unbiased by section effects or imaging resolution limits. These techniques are a powerful combination that can present complementary views of crystallinity.
从太空凝结到行星表面撞击再到火山活动等不同过程产生的岩石都含有晶体和非晶体物质。结晶度可提供有关样品热历史的信息,在描述火山岩和火成岩的特征时尤为重要,因为熔岩流变学深受晶体含量的影响。晶体度通常通过显微镜,利用透射光或背散射电子进行量化。然而,许多样品呈现出明显的模糊纹理,如晶体相间紧密生长,和/或晶体尺寸小至纳米级。在此,我们采用热容量和热焓等热量测定方法来评估一系列火山岩样品的结晶度。我们使用差示扫描量热法,对来自 2018 年基劳埃阿下东部裂谷区的 30-40 毫克等分玄武岩粉末进行了三种不同方法的测试。第一种方法是测定玻璃化转变时热容量增加的幅度,这可以确定结晶度,1𝜎精度为±3%。第二种方法以熔焓为基础,需要更长更复杂的过程,其结果通常比热容量法更不确定,1𝜎 的精度为 ±6%。最后一种方法是利用热容量计算出的热焓差,这种方法需要最复杂的程序,其不确定性最大,为 ±18%。通过显微镜测定结晶度为 11-98% 的熔岩的初步结果表明,基于热量测定数据的结晶度可能比通过显微镜和岩相分析确定的平均值高出数十个百分点。基于图像的方法适用于样品切片,可揭示纹理和结晶度的空间异质性和细节,而基于量热法的方法可捕捉 "块状样品 "的整体特性,不受切片效应或成像分辨率限制的影响。这些技术是一种强大的组合,可以对结晶度进行互补性观察。
{"title":"Estimates of Crystallinity utilizing Differential Scanning Calorimetry: Application to the Kīlauea 2018 lower East Rift Zone Eruption","authors":"B A Halverson, A Emerson, J Hammer, J Lira, A Whittington","doi":"10.1093/petrology/egae010","DOIUrl":"https://doi.org/10.1093/petrology/egae010","url":null,"abstract":"Rocks produced by diverse processes, from condensation in space to impacts on planetary surfaces to volcanism, contain both crystals and amorphous material. Crystallinity provides information on the thermal history of the sample and is especially important in characterizing volcanic rocks and pyroclasts because lava rheology is profoundly influenced by the crystal content. Crystallinity is typically quantified via microscopy, using transmitted light or backscattered electrons. However, many samples present visibly ambiguous textures such as intimate intergrowth of crystal phases, and/or crystal sizes extending down to the nanometer scale. Here we apply calorimetric methods involving heat capacity and enthalpy to assess the crystallinity of a series of volcanic samples. We tested three different approaches, using differential scanning calorimetry, on 30-40 mg aliquots of powdered basalts from the 2018 Kīlauea lower East Rift Zone. The first approach involves determining the magnitude of the increase in heat capacity at the glass transition , which can determine crystallinity to a 1𝜎 precision of ±3%. The second approach is based on the enthalpy of fusion, which requires a longer more complex procedure with results that are typically more uncertain than for the heat capacity method, with a 1𝜎 of ±6%. A final method utilizing differences in enthalpies calculated from the heat capacities required the most complex procedure, and has the greatest uncertainty of ±18%. Preliminary results for lavas with microscopically determined crystallinities ranging from 11-98% indicate that crystallinity based on calorimetric data can be tens of percent higher than the average value identified using microscopy and petrographic analysis. Image-based methodologies applied to sections of samples reveal spatial heterogeneity and details in texture and crystallinity, whereas calorimetry-based methodologies capture the overall \"bulk sample\" properties, unbiased by section effects or imaging resolution limits. These techniques are a powerful combination that can present complementary views of crystallinity.","PeriodicalId":16751,"journal":{"name":"Journal of Petrology","volume":"3 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2024-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139762600","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The origin and differentiation of CO2-rich primary melts in Ocean Island volcanoes: Integrating 3D X-ray tomography with chemical microanalysis of olivine-hosted melt inclusions from Pico (Azores) 大洋岛火山中富含二氧化碳的原生熔体的起源和分化:将三维 X 射线层析成像与来自皮科(亚速尔群岛)的橄榄石托管熔体夹杂物的化学微分析相结合
IF 3.9 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS Pub Date : 2024-01-30 DOI: 10.1093/petrology/egae006
Thomas D van Gerve, David A Neave, Penny Wieser, Hector Lamadrid, Niels Hulsbosch, Olivier Namur
Constraining the initial differentiation of primary mantle melts is vital for understanding magmatic systems as a whole. Chemical compositions of olivine-hosted melt inclusions preserve unique information about the mantle sources, crystallisation behaviour and volatile budgets of such melts. Crucially, melt inclusion CO2 contents can be linked to mantle CO2 budgets and inform us on Earth’s carbon fluxes and cycles. However, determining total inclusion CO2 contents is not straightforward, as they often need to be reconstructed from CO2 dissolved in melts and CO2 stored in a vapour bubble. Here, we improve upon existing reconstruction methods by combining 3D X-Ray Computed Tomography (CT) with geochemical microanalyses of major, trace and volatile elements. We show that in comparison to CT data, traditional reconstruction methods using 2D photomicrographs can underestimate CO2 budgets by more than 40%. We applied our improved methods to basaltic olivine-hosted melt inclusions from Pico volcano (Azores) in order constrain the formation and differentiation of volatile-rich primary melts in the context of a mantle plume. Results for these inclusions yielded 1935–9275 μg/g reconstructed total CO2, some of the highest values reported for ocean island volcanoes to date. Using these CO2 concentrations, we calculate entrapment pressures of 105–754 MPa that indicate a magma reservoir comprising stacked sills straddling the crust-mantle boundary. In the magma reservoir, crystallisation of volatile saturated melts drives extensive degassing, leading to fractionated CO2/Ba ratios of 3.5–62.2 and a loss of over 79% of primary mantle-derived CO2. Variabilities in trace elements (La, Y) show that differentiation occurred by concurrent mixing and crystallisation of two endmember melts, respectively depleted and enriched in trace elements. Geochemical models show that enriched endmember melts constitute 33 wt.% of all melts supplied to the crust at Pico and that primary melts underwent 60% crystallisation prior to eruption. Mantle melting models indicate that the enriched and depleted primary melt endmembers are low- and high-degree melts of carbon-poor lherzolite and carbon-rich pyroxenite respectively. Moreover, since deep magmas at Pico island are dominantly pyroxenite derived, their CO2-enrichement is mainly controlled by mantle source carbon content. Overall, our study illustrates that by combining 3D imaging, geochemical microanalyses and numerical modelling, melt inclusions provide a unique record of differentiation and storage of deep magmas, as well as mantle melting.
确定原生地幔熔体的初始分异对于了解整个岩浆系统至关重要。橄榄石寄生熔融包裹体的化学成分保留了有关此类熔体的地幔来源、结晶行为和挥发性预算的独特信息。最重要的是,熔融包裹体中的二氧化碳含量可以与地幔二氧化碳预算联系起来,为我们提供有关地球碳通量和碳循环的信息。然而,确定熔融包裹体的二氧化碳总含量并不简单,因为通常需要根据溶解在熔体中的二氧化碳和储存在气泡中的二氧化碳来重建。在这里,我们将三维 X 射线计算机断层扫描(CT)与主要、痕量和挥发性元素的地球化学微分析相结合,改进了现有的重建方法。我们的研究表明,与 CT 数据相比,使用二维显微照片的传统重建方法会低估 40% 以上的二氧化碳预算。我们将改进后的方法应用于皮克火山(亚速尔群岛)的玄武岩橄榄石包裹体,以确定地幔羽流背景下富含挥发性原生熔体的形成和分化。这些包裹体的结果得出了 1935-9275 μg/g 的重建二氧化碳总量,这是迄今为止海洋岛屿火山所报告的最高值。利用这些二氧化碳浓度,我们计算出了 105-754 兆帕的夹层压力,这表明岩浆储层由横跨地壳-地幔边界的堆叠山体组成。在岩浆储层中,挥发性饱和熔体的结晶推动了大范围的脱气,导致二氧化碳/钡分馏比达到 3.5-62.2 ,原生地幔二氧化碳损失超过 79%。痕量元素(La、Y)的变化表明,分异是通过两种内成熔体的同时混合和结晶而发生的,这两种内成熔体分别贫乏和富集了痕量元素。地球化学模型显示,富含微量元素的内质熔体占皮科地壳所有熔体的33%,原生熔体在喷发前经历了60%的结晶。地幔熔融模型表明,富集和贫化的原生熔体内质分别是贫碳的蛭石和富碳的辉绿岩的低度和高度熔体。此外,由于皮科岛的深部岩浆主要来自辉绿岩,其二氧化碳富集程度主要受地幔源碳含量的控制。总之,我们的研究表明,通过将三维成像、地球化学微分析和数值建模相结合,熔融包裹体为深部岩浆的分化和储存以及地幔熔化提供了独特的记录。
{"title":"The origin and differentiation of CO2-rich primary melts in Ocean Island volcanoes: Integrating 3D X-ray tomography with chemical microanalysis of olivine-hosted melt inclusions from Pico (Azores)","authors":"Thomas D van Gerve, David A Neave, Penny Wieser, Hector Lamadrid, Niels Hulsbosch, Olivier Namur","doi":"10.1093/petrology/egae006","DOIUrl":"https://doi.org/10.1093/petrology/egae006","url":null,"abstract":"Constraining the initial differentiation of primary mantle melts is vital for understanding magmatic systems as a whole. Chemical compositions of olivine-hosted melt inclusions preserve unique information about the mantle sources, crystallisation behaviour and volatile budgets of such melts. Crucially, melt inclusion CO2 contents can be linked to mantle CO2 budgets and inform us on Earth’s carbon fluxes and cycles. However, determining total inclusion CO2 contents is not straightforward, as they often need to be reconstructed from CO2 dissolved in melts and CO2 stored in a vapour bubble. Here, we improve upon existing reconstruction methods by combining 3D X-Ray Computed Tomography (CT) with geochemical microanalyses of major, trace and volatile elements. We show that in comparison to CT data, traditional reconstruction methods using 2D photomicrographs can underestimate CO2 budgets by more than 40%. We applied our improved methods to basaltic olivine-hosted melt inclusions from Pico volcano (Azores) in order constrain the formation and differentiation of volatile-rich primary melts in the context of a mantle plume. Results for these inclusions yielded 1935–9275 μg/g reconstructed total CO2, some of the highest values reported for ocean island volcanoes to date. Using these CO2 concentrations, we calculate entrapment pressures of 105–754 MPa that indicate a magma reservoir comprising stacked sills straddling the crust-mantle boundary. In the magma reservoir, crystallisation of volatile saturated melts drives extensive degassing, leading to fractionated CO2/Ba ratios of 3.5–62.2 and a loss of over 79% of primary mantle-derived CO2. Variabilities in trace elements (La, Y) show that differentiation occurred by concurrent mixing and crystallisation of two endmember melts, respectively depleted and enriched in trace elements. Geochemical models show that enriched endmember melts constitute 33 wt.% of all melts supplied to the crust at Pico and that primary melts underwent 60% crystallisation prior to eruption. Mantle melting models indicate that the enriched and depleted primary melt endmembers are low- and high-degree melts of carbon-poor lherzolite and carbon-rich pyroxenite respectively. Moreover, since deep magmas at Pico island are dominantly pyroxenite derived, their CO2-enrichement is mainly controlled by mantle source carbon content. Overall, our study illustrates that by combining 3D imaging, geochemical microanalyses and numerical modelling, melt inclusions provide a unique record of differentiation and storage of deep magmas, as well as mantle melting.","PeriodicalId":16751,"journal":{"name":"Journal of Petrology","volume":"9 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2024-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139644794","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Incomplete hydration during ‘retrograde’ metamorphism: ‘Barrovian’ kyanite-, staurolite-, chloritoid-bearing pseudomorphs after andalusite (Cap de Creus, E Pyrenees, Spain) 逆行 "变质过程中的不完全水化:安柱石之后的 "巴罗维亚 "黝帘石、白云石和绿帘石假象(西班牙比利牛斯山东部克鲁斯角)
IF 3.9 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS Pub Date : 2024-01-30 DOI: 10.1093/petrology/egae004
Pavel Pitra, Francisco José Martínez
Metapelitic rocks from Cap de Creus (Eastern Pyrenees, Spain) have developed andalusite±cordierite-bearing assemblages during the Variscan low-pressure high-temperature metamorphism. Andalusite crystals are commonly transformed to very fine-grained assemblages containing white micas with various combinations of staurolite, kyanite, chloritoid, and/or biotite, chlorite, corundum. The hydrous character of the replacement minerals (pseudomorphing anhydrous andalusite) and the fact that transformation locally occurs along fractures, suggests that it was enhanced by fluid circulation. Using calculated equilibrium-assemblage phase diagrams (pseudosections) for the analysed whole-rock compositions, the equilibration of the primary andalusite-bearing assemblage is constrained at ~3±1 kbar and ~550±30°C. The presence in the pseudomorphs of kyanite and staurolite, typical of Barrovian-type metamorphism, could suggest a pressure increase. However, P–T–M(H2O) modelling of phase equilibria for local bulk compositions of the pseudomorphed andalusite porphyroblasts points to the crystallisation of the observed pseudomorphs at low pressures (~2.5 kbar) and variable, but relatively low temperatures (~370–500°C), in an H2O-undersaturated environment due to the incomplete character of the hydration. In other words, the fluid incursion triggered the crystallisation of the hydrous pseudomorphing assemblages, but the fluid was consumed during this process, leading finally to fluid-absent, H2O-undersaturated conditions. This highlights the critical importance of considering the effects of H2O undersaturation during metamorphism. The partial hydration can be tentatively attributed to a prograde hydrothermal overprint associated with the development of shear zones during Jurassic stretching of a cooled Variscan crust, rather than ‘simple’ late-Variscan retrogression.
在瓦里斯坎低压高温变质过程中,Cap de Creus(西班牙东比利牛斯山)的绿泥石岩石形成了含安达黄石和堇青石的集合体。安柱石晶体通常会转变为含白色云母的细粒集合体,其中含有不同组合的白云母、褐铁矿、绿泥石和/或生物黄铁矿、绿泥石、刚玉。置换矿物的水化物特征(假象无水安山岩)以及沿断裂局部发生转化的事实表明,流体循环增强了这种转化。利用所分析的全岩成分计算出的平衡组合相图(假相图),可将含安岳石的原生组合的平衡温度限制在~3±1千巴和~550±30°C。假晶岩中存在典型的巴罗维变质作用的闪长岩和白云石,这可能表明压力有所增加。然而,对假变质安山斑岩的局部块体成分进行的相平衡 P-T-M(H2O)建模表明,由于水合作用不完全,所观察到的假变质斑岩是在低压(约 2.5 千巴)和可变但相对较低的温度(约 370-500°C)下,在 H2O 未饱和的环境中结晶的。换句话说,流体侵入引发了水合假象组合体的结晶,但在此过程中流体被消耗掉,最终导致流体缺失和 H2O 不饱和条件。这凸显了在变质过程中考虑 H2O 不饱和影响的极端重要性。部分水合作用可初步归因于侏罗纪冷却的瓦利斯卡地壳拉伸过程中与剪切带发展相关的热液顺行叠加作用,而不是 "简单的 "晚瓦利斯卡逆行作用。
{"title":"Incomplete hydration during ‘retrograde’ metamorphism: ‘Barrovian’ kyanite-, staurolite-, chloritoid-bearing pseudomorphs after andalusite (Cap de Creus, E Pyrenees, Spain)","authors":"Pavel Pitra, Francisco José Martínez","doi":"10.1093/petrology/egae004","DOIUrl":"https://doi.org/10.1093/petrology/egae004","url":null,"abstract":"Metapelitic rocks from Cap de Creus (Eastern Pyrenees, Spain) have developed andalusite±cordierite-bearing assemblages during the Variscan low-pressure high-temperature metamorphism. Andalusite crystals are commonly transformed to very fine-grained assemblages containing white micas with various combinations of staurolite, kyanite, chloritoid, and/or biotite, chlorite, corundum. The hydrous character of the replacement minerals (pseudomorphing anhydrous andalusite) and the fact that transformation locally occurs along fractures, suggests that it was enhanced by fluid circulation. Using calculated equilibrium-assemblage phase diagrams (pseudosections) for the analysed whole-rock compositions, the equilibration of the primary andalusite-bearing assemblage is constrained at ~3±1 kbar and ~550±30°C. The presence in the pseudomorphs of kyanite and staurolite, typical of Barrovian-type metamorphism, could suggest a pressure increase. However, P–T–M(H2O) modelling of phase equilibria for local bulk compositions of the pseudomorphed andalusite porphyroblasts points to the crystallisation of the observed pseudomorphs at low pressures (~2.5 kbar) and variable, but relatively low temperatures (~370–500°C), in an H2O-undersaturated environment due to the incomplete character of the hydration. In other words, the fluid incursion triggered the crystallisation of the hydrous pseudomorphing assemblages, but the fluid was consumed during this process, leading finally to fluid-absent, H2O-undersaturated conditions. This highlights the critical importance of considering the effects of H2O undersaturation during metamorphism. The partial hydration can be tentatively attributed to a prograde hydrothermal overprint associated with the development of shear zones during Jurassic stretching of a cooled Variscan crust, rather than ‘simple’ late-Variscan retrogression.","PeriodicalId":16751,"journal":{"name":"Journal of Petrology","volume":"60 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2024-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139645068","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Tracking garnet dissolution kinetics in 3D using deep learning grain shape classification 利用深度学习晶粒形状分类在三维空间跟踪石榴石溶解动力学
IF 3.9 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS Pub Date : 2024-01-30 DOI: 10.1093/petrology/egae005
Philip Hartmeier, Pierre Lanari, Jacob B Forshaw, Thorsten A Markmann
The kinetics of fluid-driven metamorphic reactions are challenging to study in nature because of the tendency of metamorphic systems to converge towards chemical equilibrium. However, in cases where mineral textures that reflect incomplete reactions are preserved, kinetic processes may be investigated. Atoll garnet, a texture formed by the dissolution of a garnet’s core, has been described in 2D from thin sections of rocks worldwide. Quantifying the extent of this dissolution reaction requires sample-wide examination of hundreds of individual grains in 3D. In this study, we quantified the distribution of atoll garnet using micro-computed tomography and grain shape analysis. A convolutional neural network was trained on human-labelled garnet grains for automated garnet classification. This approach was applied to a retrogressed mafic eclogite from the Zermatt-Saas Zone (Western Alps). Pervasive atoll-like resorption preferentially affected the larger porphyroblasts, suggesting that compositional zoning patterns exert a first-order control on dissolution rates. A kinetic model shows that the reactivity of metastable garnet to form atolls is favored at pressure-temperature conditions of 560±30 °C and 1.6±0.2 GPa. These conditions coincide with the release of water when lawsonite breaks down during exhumation of mafic eclogites. The model predicts dissolution rates that are 3–5 times faster for the garnet core than for the rim. This study shows that deep learning algorithms can perform automated textural analysis of crystal shapes in 3D and that these datasets have the potential to elucidate petrological processes, such as the kinetics of fluid-driven metamorphic reactions.
在自然界中研究流体驱动的变质反应动力学具有挑战性,因为变质系统往往趋于化学平衡。不过,在保留了反映不完全反应的矿物纹理的情况下,可以对动力学过程进行研究。环状石榴石是石榴石核心溶解形成的一种纹理,世界各地的岩石薄切片都有二维描述。要量化这种溶解反应的程度,需要对数以百计的单个颗粒进行全样本三维检测。在这项研究中,我们利用微型计算机断层扫描和晶粒形状分析对环礁石榴石的分布进行了量化。在人类标记的石榴石颗粒上训练了一个卷积神经网络,以实现石榴石的自动分类。这种方法被应用于来自泽尔马特-萨斯区(西阿尔卑斯山)的退变黑云母闪长岩。无处不在的胶体状吸收优先影响较大的斑岩,这表明成分分区模式对溶解速率具有一阶控制作用。动力学模型表明,在 560±30 ℃ 和 1.6±0.2 GPa 的压力-温度条件下,可变质石榴石的反应性更有利于形成胶体。这些条件与岩浆闪长岩在出岩过程中罗桑石分解时释放出的水相吻合。该模型预测石榴石内核的溶解速度是边缘的3-5倍。这项研究表明,深度学习算法可以对三维晶体形状进行自动纹理分析,这些数据集具有阐明岩石学过程(如流体驱动的变质反应动力学)的潜力。
{"title":"Tracking garnet dissolution kinetics in 3D using deep learning grain shape classification","authors":"Philip Hartmeier, Pierre Lanari, Jacob B Forshaw, Thorsten A Markmann","doi":"10.1093/petrology/egae005","DOIUrl":"https://doi.org/10.1093/petrology/egae005","url":null,"abstract":"The kinetics of fluid-driven metamorphic reactions are challenging to study in nature because of the tendency of metamorphic systems to converge towards chemical equilibrium. However, in cases where mineral textures that reflect incomplete reactions are preserved, kinetic processes may be investigated. Atoll garnet, a texture formed by the dissolution of a garnet’s core, has been described in 2D from thin sections of rocks worldwide. Quantifying the extent of this dissolution reaction requires sample-wide examination of hundreds of individual grains in 3D. In this study, we quantified the distribution of atoll garnet using micro-computed tomography and grain shape analysis. A convolutional neural network was trained on human-labelled garnet grains for automated garnet classification. This approach was applied to a retrogressed mafic eclogite from the Zermatt-Saas Zone (Western Alps). Pervasive atoll-like resorption preferentially affected the larger porphyroblasts, suggesting that compositional zoning patterns exert a first-order control on dissolution rates. A kinetic model shows that the reactivity of metastable garnet to form atolls is favored at pressure-temperature conditions of 560±30 °C and 1.6±0.2 GPa. These conditions coincide with the release of water when lawsonite breaks down during exhumation of mafic eclogites. The model predicts dissolution rates that are 3–5 times faster for the garnet core than for the rim. This study shows that deep learning algorithms can perform automated textural analysis of crystal shapes in 3D and that these datasets have the potential to elucidate petrological processes, such as the kinetics of fluid-driven metamorphic reactions.","PeriodicalId":16751,"journal":{"name":"Journal of Petrology","volume":"37 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2024-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139644647","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The effects of partial melting and metasomatism on peridotite water contents: insights from Shuangliao Volcano Group, Northeast China 部分熔融和变质作用对橄榄岩含水率的影响:中国东北双辽火山群的启示
IF 3.9 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS Pub Date : 2024-01-17 DOI: 10.1093/petrology/egae003
Chang-Yu Zhu, Huan Chen, Yan-Tao Hao
Many minerals within the subcontinental lithospheric mantle (SCLM) contain structurally bonded hydrogen (commonly referred to as “water”), which significantly impacts their physical properties and associated geodynamic processes. Observations from different localities worldwide make understanding the behavior of hydrogen during partial melting and mantle metasomatism a contentious issue, as different localities reveal either melting or metasomatism as the controlling factor. To provide new insights, major elements, trace elements and water contents of peridotite xenoliths from three volcanoes of the Shuangliao Volcano Group in Northeast China were analyzed. Minerals display variations in major and trace elements, particularly in clinopyroxene. Most olivine contain no observable water, while orthopyroxene and clinopyroxene retained 14-157 μg/g and 46-351 μg/g of water, respectively. Samples were divided into 3 types according to trace element patterns, namely, type 1: Light Rare Earth Elements (LREE)-depleted samples; type 2: “spoon-shaped” samples featuring slight enrichment of the most incompatible elements (La and Ce) and relative depletion of Mid-REE; and type 3: LREE-enriched samples. Combined with major element trends, the Shuangliao SCLM experienced varying degrees of partial melting and cryptic metasomatism. Different water contents in the Shuangliao SCLM are a combined result of melting and metasomatism: less metasomatized samples (LREE-depleted and “spoon-shaped”) preserved the control of water contents by partial melting, while strongly metasomatized samples (LREE-enriched), equilibrated at higher oxygen fugacity and temperature, display considerable post-melting modifications of water contents, possibly associated with Fe redox. These characteristics suggest that hydrous and oxidized melts/fluids likely released by the stagnant Pacific slab in the Big Mantle Wedge (BMW) have metasomatized the shallow SCLM beneath Shuangliao, which indicates the circulation of materials released by the stagnant slab throughout the upper mantle.
亚大陆岩石圈地幔(SCLM)中的许多矿物都含有结构键氢(通常称为 "水"),这对它们的物理性质和相关的地球动力学过程产生了重大影响。全球不同地区的观测结果表明,氢在部分熔化和地幔变质过程中的行为是一个有争议的问题,因为不同地区的观测结果表明,熔化或变质是控制氢的因素。为了提供新的见解,研究人员分析了中国东北双辽火山群三座火山的橄榄岩奇石中的主要元素、微量元素和水含量。矿物中的主要元素和微量元素都有变化,特别是在褐辉石中。大多数橄榄石不含有可观察到的水分,而正长石和霞石分别含有 14-157 μg/g 和 46-351 μg/g 的水分。根据微量元素的变化规律,将样品分为三类:第一类:轻稀土元素贫化样品;第二类:"勺形 "样品,其特征是最不相容元素(La 和 Ce)轻微富集,而中稀土元素相对贫化;第三类:轻稀土元素富集样品。结合主要元素的变化趋势,双辽SCLM经历了不同程度的部分熔融和隐伏变质作用。双辽SCLM中不同的含水率是熔融和变质作用的综合结果:变质作用较弱的样品(LREE贫化和 "勺状")通过部分熔融保留了对含水率的控制;而在较高的氧富集度和温度下平衡的强变质样品(LREE富集)则显示出熔融后含水率的显著变化,可能与铁氧化还原作用有关。这些特征表明,大地幔楔(BMW)中停滞的太平洋板块可能释放出的含水和氧化熔体/流体对双辽地下的浅层SCLM进行了元气化,这表明停滞板块释放的物质在整个上地幔中进行了循环。
{"title":"The effects of partial melting and metasomatism on peridotite water contents: insights from Shuangliao Volcano Group, Northeast China","authors":"Chang-Yu Zhu, Huan Chen, Yan-Tao Hao","doi":"10.1093/petrology/egae003","DOIUrl":"https://doi.org/10.1093/petrology/egae003","url":null,"abstract":"Many minerals within the subcontinental lithospheric mantle (SCLM) contain structurally bonded hydrogen (commonly referred to as “water”), which significantly impacts their physical properties and associated geodynamic processes. Observations from different localities worldwide make understanding the behavior of hydrogen during partial melting and mantle metasomatism a contentious issue, as different localities reveal either melting or metasomatism as the controlling factor. To provide new insights, major elements, trace elements and water contents of peridotite xenoliths from three volcanoes of the Shuangliao Volcano Group in Northeast China were analyzed. Minerals display variations in major and trace elements, particularly in clinopyroxene. Most olivine contain no observable water, while orthopyroxene and clinopyroxene retained 14-157 μg/g and 46-351 μg/g of water, respectively. Samples were divided into 3 types according to trace element patterns, namely, type 1: Light Rare Earth Elements (LREE)-depleted samples; type 2: “spoon-shaped” samples featuring slight enrichment of the most incompatible elements (La and Ce) and relative depletion of Mid-REE; and type 3: LREE-enriched samples. Combined with major element trends, the Shuangliao SCLM experienced varying degrees of partial melting and cryptic metasomatism. Different water contents in the Shuangliao SCLM are a combined result of melting and metasomatism: less metasomatized samples (LREE-depleted and “spoon-shaped”) preserved the control of water contents by partial melting, while strongly metasomatized samples (LREE-enriched), equilibrated at higher oxygen fugacity and temperature, display considerable post-melting modifications of water contents, possibly associated with Fe redox. These characteristics suggest that hydrous and oxidized melts/fluids likely released by the stagnant Pacific slab in the Big Mantle Wedge (BMW) have metasomatized the shallow SCLM beneath Shuangliao, which indicates the circulation of materials released by the stagnant slab throughout the upper mantle.","PeriodicalId":16751,"journal":{"name":"Journal of Petrology","volume":"99 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2024-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139482666","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The elusive Congo craton margin during Gondwana breakup: Insights from lithospheric mantle structure and heat-flow beneath the Xaudum kimberlite province, NW Botswana 冈瓦纳断裂期间难以捉摸的刚果克拉通边缘:从博茨瓦纳西北部Xaudum金伯利岩矿区下方岩石圈地幔结构和热流中获得的启示
IF 3.9 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS Pub Date : 2024-01-17 DOI: 10.1093/petrology/egae002
Azhar M Shaikh, Sebastian Tappe, Fanus Viljoen, Mike C J de Wit
The continental lithospheric mantle (CLM) beneath the southern margin of the Congo craton has remained elusive mainly because of thick Phanerozoic sedimentary cover concealing possible kimberlite and lamproite diatremes. In this study, we explore this lithospheric mantle section by using major and trace element compositions of mantle-derived clinopyroxene and garnet xenocrysts from kimberlites of the ca. 84 Ma Nxau Nxau cluster in NW Botswana, which is part of the poorly known Xaudum kimberlite province extending into northern Namibia. We utilize these data to better understand the thermal and compositional evolution of the lithospheric mantle at the southern margin of the Congo craton. The clinopyroxene population (83 individual grains) comprises Cr-rich and Cr-poor diopsides with variable major (Al2O3, Na2O, Mg#) and incompatible trace element (U, Th, Zr, Hf, Nb, Ta, REEs) compositions. The large garnet population studied (496 individual grains) is dominated by lherzolitic G9 (38%) and `megacrystic´ G1 (41%) compositions, with minor contributions from Ti-metasomatized G11 (7%) and eclogitic G3 (6%) cratonic mantle sources. Harzburgitic G10 garnet is very rare (two grains only), consistent with a lherzolite-dominated CLM section in a craton margin position. The eclogitic garnet population has compositions akin to garnet from high-Mg cratonic mantle eclogite xenoliths, and such compositions have recently been interpreted as metasomatic in origin within the mantle xenoliths literature. Pressure–temperature calculations using the single-grain clinopyroxene technique reveal a relatively cold cratonic geotherm of 37-38 mW/m2 for the study region during the Late Mesozoic. For peridotitic garnets, projections of calculated Ni-in-garnet temperatures onto the independently constrained regional conductive geotherm suggest that lherzolite dominates at <145 km depths, whereas high-Ti lherzolitic G11 garnets and `megacrystic´ G1 garnets originate mostly from greater depths, down to the lithosphere base at 150 to 210 km depth. The apparent confinement of ´megacrystic´ G1 garnet to the bottom of the lithosphere suggests formation from infiltrating asthenosphere-derived proto-kimberlite liquids during melt–rock interactions. In general, the data suggest that the CLM beneath NW Botswana is depleted to about 145 km depth, and between 145-210 km depths a thick metasomatized layer is identified, representing the transition into the underlying asthenosphere. A relatively thin lithosphere beneath NW Botswana is consistent with the proposed craton margin setting, especially when compared to the thicker cratonic roots beneath the central regions of the Congo and Kalahari cratons in Angola and South Africa, respectively, reaching down to 250 km depth and possibly even deeper. The compositional dissimilarity between the deepest-derived garnets from kimberlites in NW Botswana (i.e., from the diamond stability field) and garnets that occur as inclusions in diamond f
刚果克拉通南缘下方的大陆岩石圈地幔(CLM)一直难以捉摸,主要原因是厚厚的新生代沉积覆盖层掩盖了可能的金伯利岩和灯泡岩二叠体。在本研究中,我们利用来自约 84 Ma Nxau Nxau 金伯利岩的地幔衍生倩辉石和石榴石异晶石的主要和痕量元素组成,对这一岩石圈地幔部分进行了探索。博茨瓦纳西北部 84 Ma Nxau Nxau 金伯利岩群是延伸至纳米比亚北部的鲜为人知的 Xaudum 金伯利岩区的一部分。我们利用这些数据来更好地了解刚果克拉通南缘岩石圈地幔的热演化和成分演变。菱镁矿群(83 个单个晶粒)包括富铬和贫铬二元菱镁矿,其主要成分(Al2O3、Na2O、Mg#)和不相容微量元素(U、Th、Zr、Hf、Nb、Ta、REEs)成分各不相同。所研究的大型石榴石群(496粒)主要由黑沸石G9(38%)和 "巨晶 "G1(41%)组成,另有少量来自钛-金属化G11(7%)和蚀变G3(6%)板幔源。Harzburgitic G10石榴石非常罕见(只有两粒),这与克拉通边缘位置以蛭石为主的CLM断面一致。斜长岩石榴石群的成分类似于来自高镁板块地幔斜长岩异长岩的石榴石,这种成分最近在地幔异长岩文献中被解释为元杂质来源。利用单晶粒clinopyroxene技术进行的压力-温度计算显示,在中生代晚期,研究区域的地幔地温为37-38 mW/m2,相对较低。就橄榄石榴辉岩而言,将计算出的榴辉岩中镍的温度投影到独立约束的区域传导地温上表明,蛭石在<145千米深处占主导地位,而高钛蛭石G11榴辉岩和 "巨晶 "G1榴辉岩则主要来自更深的地方,一直到岩石圈底部150至210千米深处。麦哲伦G1石榴石明显被限制在岩石圈底部,这表明它们是在熔岩-岩石相互作用过程中由渗入天体圈的原金伯利岩液体形成的。总体而言,数据表明,博茨瓦纳西北部地下的CLM已经耗竭到大约145千米的深度,在145-210千米的深度之间发现了一个厚的变质层,代表着向底层岩石圈的过渡。博茨瓦纳西北部地下的岩石圈相对较薄,这与所提出的克拉通边缘环境相符,尤其是与安哥拉和南非的刚果和卡拉哈里克拉通中部地区地下较厚的克拉通根系相比,其深度可达 250 千米,甚至可能更深。博茨瓦纳西北部金伯利岩(即金刚石稳定场)中最深的石榴石与世界各地的陨石坑中作为金刚石包裹体出现的石榴石之间的成分差异表明,与氧化熔融有关的变质作用对最下部的陨石坑岩石圈造成了广泛的覆盖。这一发现,再加上绍杜姆金伯利岩钻石品位很低,表明位于刚果陨石坑北部(如卡托卡)和卡拉哈里陨石坑南部(如奥拉帕和瓦嫩)主要钻石开采区之间的大片且大部分未暴露的 "陨石 "地区(如被厚厚的沙漠沙覆盖)的钻石潜力已经减弱。
{"title":"The elusive Congo craton margin during Gondwana breakup: Insights from lithospheric mantle structure and heat-flow beneath the Xaudum kimberlite province, NW Botswana","authors":"Azhar M Shaikh, Sebastian Tappe, Fanus Viljoen, Mike C J de Wit","doi":"10.1093/petrology/egae002","DOIUrl":"https://doi.org/10.1093/petrology/egae002","url":null,"abstract":"The continental lithospheric mantle (CLM) beneath the southern margin of the Congo craton has remained elusive mainly because of thick Phanerozoic sedimentary cover concealing possible kimberlite and lamproite diatremes. In this study, we explore this lithospheric mantle section by using major and trace element compositions of mantle-derived clinopyroxene and garnet xenocrysts from kimberlites of the ca. 84 Ma Nxau Nxau cluster in NW Botswana, which is part of the poorly known Xaudum kimberlite province extending into northern Namibia. We utilize these data to better understand the thermal and compositional evolution of the lithospheric mantle at the southern margin of the Congo craton. The clinopyroxene population (83 individual grains) comprises Cr-rich and Cr-poor diopsides with variable major (Al2O3, Na2O, Mg#) and incompatible trace element (U, Th, Zr, Hf, Nb, Ta, REEs) compositions. The large garnet population studied (496 individual grains) is dominated by lherzolitic G9 (38%) and `megacrystic´ G1 (41%) compositions, with minor contributions from Ti-metasomatized G11 (7%) and eclogitic G3 (6%) cratonic mantle sources. Harzburgitic G10 garnet is very rare (two grains only), consistent with a lherzolite-dominated CLM section in a craton margin position. The eclogitic garnet population has compositions akin to garnet from high-Mg cratonic mantle eclogite xenoliths, and such compositions have recently been interpreted as metasomatic in origin within the mantle xenoliths literature. Pressure–temperature calculations using the single-grain clinopyroxene technique reveal a relatively cold cratonic geotherm of 37-38 mW/m2 for the study region during the Late Mesozoic. For peridotitic garnets, projections of calculated Ni-in-garnet temperatures onto the independently constrained regional conductive geotherm suggest that lherzolite dominates at <145 km depths, whereas high-Ti lherzolitic G11 garnets and `megacrystic´ G1 garnets originate mostly from greater depths, down to the lithosphere base at 150 to 210 km depth. The apparent confinement of ´megacrystic´ G1 garnet to the bottom of the lithosphere suggests formation from infiltrating asthenosphere-derived proto-kimberlite liquids during melt–rock interactions. In general, the data suggest that the CLM beneath NW Botswana is depleted to about 145 km depth, and between 145-210 km depths a thick metasomatized layer is identified, representing the transition into the underlying asthenosphere. A relatively thin lithosphere beneath NW Botswana is consistent with the proposed craton margin setting, especially when compared to the thicker cratonic roots beneath the central regions of the Congo and Kalahari cratons in Angola and South Africa, respectively, reaching down to 250 km depth and possibly even deeper. The compositional dissimilarity between the deepest-derived garnets from kimberlites in NW Botswana (i.e., from the diamond stability field) and garnets that occur as inclusions in diamond f","PeriodicalId":16751,"journal":{"name":"Journal of Petrology","volume":"25 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2024-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139482534","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Are microstructures in plutonic rocks primary or secondary?: a re-examination of the metasomatism hypothesis for the roof-sourced autoliths in the Skaergaard intrusion 深成岩中的微结构是原生的还是次生的?
IF 3.9 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS Pub Date : 2024-01-17 DOI: 10.1093/petrology/egae001
Marian B Holness, Jens C Ø Andersen, Olivier Namur, Troels F D Nielsen
The roof-derived autoliths in the floor cumulates of the Skaergaard Intrusion have been argued to have been extensively metasomatized and recrystallised, forming the foundation of the hypothesis that microstructures in plutonic rocks are essentially metamorphic. However, the augite-plagioclase-plagioclase dihedral angles and plagioclase core composition of the autoliths match with those of the roof rocks, demonstrating that they were generally solid on arrival at the floor, with no subsequent microstructural or compositional modification. Many autoliths have mafic rinds, which were used as evidence of metasomatism: these rinds fall into two groups. The rarely developed rind rock of Irvine et al. (1998) is most likely chilled magma infiltrating along fractures in the roof rocks, either associated directly with detachment of roof material, or occurring before final detachment. Thin mafic rims are widespread in LZc and MZ, present at the tops of the more elongate autoliths, with a corresponding felsic rim at the base of the most elongate. The close correspondence of thin rim development with autolith shape, rather than composition, is argued to be evidence that they formed as a result of differential migration of immiscible conjugate interstitial liquids: the dense Fe-rich liquid flowed downwards and ponded on the tops of impermeable autoliths, whereas its buoyant Si-rich conjugate flowed upwards and was trapped underneath. Any differences in microstructure and bulk composition of the autoliths compared to the remaining exposures of the roof sequence reflect the wider range of lithologies in the now-eroded regions of the roof.
斯卡加尔德侵入体底板堆积物中的顶板自成岩被认为是经过了广泛的变质和重结晶过程,这构成了关于深成岩的微结构本质上是变质岩的假说的基础。然而,自成岩的辉石-斜长石-斜长石二面角和斜长石核心成分与顶板岩石相吻合,这表明自成岩在到达底板时一般是固体,其后没有发生微结构或成分的改变。许多自结石都有黑云母岩皮,这些岩皮被用作变质作用的证据:这些岩皮可分为两类。Irvine 等人(1998 年)发现的很少发育的边缘岩很可能是沿着顶板岩石裂缝渗入的冷岩浆,要么与顶板材料的剥离直接相关,要么发生在最终剥离之前。在 LZc 和 MZ 中,稀薄的黑云母边缘非常普遍,出现在较长的自岩石顶部,而在最长的自岩石底部则有相应的长英岩边缘。薄缘的形成与自岩石的形状(而不是成分)密切相关,这证明它们是由于不相溶的共轭间隙液体的不同迁移而形成的:致密的富Fe液体向下流动,积聚在不透水的自岩石顶部,而其具有浮力的富Si共轭液体向上流动,被困在自岩石底部。自结石的微观结构和块体成分与顶板序列其余出露部分相比有任何差异,都反映了顶板现已侵蚀区域的岩性范围更广。
{"title":"Are microstructures in plutonic rocks primary or secondary?: a re-examination of the metasomatism hypothesis for the roof-sourced autoliths in the Skaergaard intrusion","authors":"Marian B Holness, Jens C Ø Andersen, Olivier Namur, Troels F D Nielsen","doi":"10.1093/petrology/egae001","DOIUrl":"https://doi.org/10.1093/petrology/egae001","url":null,"abstract":"The roof-derived autoliths in the floor cumulates of the Skaergaard Intrusion have been argued to have been extensively metasomatized and recrystallised, forming the foundation of the hypothesis that microstructures in plutonic rocks are essentially metamorphic. However, the augite-plagioclase-plagioclase dihedral angles and plagioclase core composition of the autoliths match with those of the roof rocks, demonstrating that they were generally solid on arrival at the floor, with no subsequent microstructural or compositional modification. Many autoliths have mafic rinds, which were used as evidence of metasomatism: these rinds fall into two groups. The rarely developed rind rock of Irvine et al. (1998) is most likely chilled magma infiltrating along fractures in the roof rocks, either associated directly with detachment of roof material, or occurring before final detachment. Thin mafic rims are widespread in LZc and MZ, present at the tops of the more elongate autoliths, with a corresponding felsic rim at the base of the most elongate. The close correspondence of thin rim development with autolith shape, rather than composition, is argued to be evidence that they formed as a result of differential migration of immiscible conjugate interstitial liquids: the dense Fe-rich liquid flowed downwards and ponded on the tops of impermeable autoliths, whereas its buoyant Si-rich conjugate flowed upwards and was trapped underneath. Any differences in microstructure and bulk composition of the autoliths compared to the remaining exposures of the roof sequence reflect the wider range of lithologies in the now-eroded regions of the roof.","PeriodicalId":16751,"journal":{"name":"Journal of Petrology","volume":"21 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2024-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139482669","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
An amphibole perspective on the recent magmatic evolution of Mount St. Helens 圣海伦火山近期岩浆演化的闪石视角
IF 3.9 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS Pub Date : 2024-01-09 DOI: 10.1093/petrology/egad093
Franziska Keller, Maren Wanke, Nico Kueter, Marcel Guillong, Olivier Bachmann
Compositional variations of amphibole stratigraphically recovered from multiple eruptions at a given volcano have a great potential to archive long-term magmatic processes in its crustal plumbing system. Calcic amphibole is a ubiquitous yet chemically and texturally diverse mineral at Mount St. Helens (MSH), where it occurs in dacites and in co-magmatic enclaves throughout the Spirit Lake stage (last ~4000 years of eruptive history). It forms three populations with distinct geochemical trends in key major and trace elements, which are subdivided into a high-Al (11–14.5 wt% Al2O3), a medium-Al (10–12.5 wt% Al2O3), and a low-Al (7.5–10 wt% Al2O3) amphibole population. The oldest investigated tephra record (Smith Creek period, 3900–3300 years B.P.) yields a bimodal amphibole distribution in which lower-crustal, high-Al amphibole cores (crystallized dominantly from basaltic andesite to andesite melts) and upper-crustal, low-Al amphibole rims (crystallized from rhyolitic melt) document occasional recharge of a shallow silicic mush by a more mafic melt from a lower-crustal reservoir. The sudden appearance of medium-Al amphiboles enriched in incompatible trace elements in eruptive periods younger than 2900 years B.P. is associated with a change in reservoir conditions towards hotter and drier magmas, which indicates recharge of the shallow silicic reservoir by basaltic melt enriched in incompatible elements. Deep-crystallizing, high-Al amphibole, however, appears mostly unaffected by such incompatible-element-enriched basaltic recharge, suggesting that these basalts bypass the lower crustal reservoir. This could be the result of the eastward offset position of the lower crustal reservoir relative to the upper crustal storage zone underneath the MSH edifice. Amphibole has proven to be a sensitive geochemical archive for uncovering storage conditions of magmas at Mount St. Helens. In agreement with geophysical observations, storage and differentiation have occurred in two main zones: an upper crustal and lower crustal reservoir (the lower one being chemically less evolved). The upper crustal silicic reservoir, offset to the west of the lower crustal reservoir, has captured compositionally unusual mafic recharge (drier, hotter, and enriched in incompatible trace elements in comparison to the typical parental magmas in the region), resulting in an increased chemical diversity of amphiboles and their carrier intermediate magmas, in the last ~3000 years of Mount St. Helens’s volcanic record.
从某一火山的多次喷发地层中回收的闪石成分变化具有很大的潜力,可以记录其地壳管道系统中长期的岩浆过程。在圣海伦火山(MSH),钙闪石是一种无处不在,但在化学和质地上却多种多样的矿物,它出现在整个灵湖阶段(最后约 4000 年的喷发历史)的英安岩和共岩浆岩飞地中。它形成了三个群体,其主要元素和微量元素的地球化学趋势截然不同,可细分为高铝(11-14.5 wt% Al2O3)、中铝(10-12.5 wt% Al2O3)和低铝(7.5-10 wt% Al2O3)闪石群体。最古老的研究记录(史密斯溪时期,公元前 3900-3300 年)显示了双峰闪石的分布,其中低地壳、高铝闪石核心(主要由玄武安山岩到安山岩熔体结晶而成)和上地壳、低铝闪石边缘(由流纹岩熔体结晶而成)记录了来自低地壳储层的较黑云母熔体偶尔对浅硅质淤泥的补给。在小于公元前2900年的喷发期,突然出现富含不相容微量元素的中铝闪石,这与储层条件向更热、更干燥的岩浆转变有关,表明富含不相容元素的玄武岩熔体对浅硅质储层的补给。然而,深结晶的高铝闪石似乎大多不受这种富含不相容元素的玄武岩补给的影响,这表明这些玄武岩绕过了下地壳储层。这可能是由于下地壳储层相对于 MSH 大厦下的上地壳储层区的位置向东偏移造成的。事实证明,闪石是揭示圣海伦火山岩浆储存条件的敏感地球化学档案。与地球物理观测结果一致,岩浆的贮存和分化主要发生在两个区域:上地壳和下地壳贮存区(下地壳的化学演化程度较低)。上地壳硅质储层偏向于下地壳储层的西面,捕获了成分异常的岩浆补给(与该地区典型的母岩浆相比,更干燥、更热、富含不相容微量元素),导致在圣海伦火山记录的过去约3000年中,闪石及其载体中间岩浆的化学多样性增加。
{"title":"An amphibole perspective on the recent magmatic evolution of Mount St. Helens","authors":"Franziska Keller, Maren Wanke, Nico Kueter, Marcel Guillong, Olivier Bachmann","doi":"10.1093/petrology/egad093","DOIUrl":"https://doi.org/10.1093/petrology/egad093","url":null,"abstract":"Compositional variations of amphibole stratigraphically recovered from multiple eruptions at a given volcano have a great potential to archive long-term magmatic processes in its crustal plumbing system. Calcic amphibole is a ubiquitous yet chemically and texturally diverse mineral at Mount St. Helens (MSH), where it occurs in dacites and in co-magmatic enclaves throughout the Spirit Lake stage (last ~4000 years of eruptive history). It forms three populations with distinct geochemical trends in key major and trace elements, which are subdivided into a high-Al (11–14.5 wt% Al2O3), a medium-Al (10–12.5 wt% Al2O3), and a low-Al (7.5–10 wt% Al2O3) amphibole population. The oldest investigated tephra record (Smith Creek period, 3900–3300 years B.P.) yields a bimodal amphibole distribution in which lower-crustal, high-Al amphibole cores (crystallized dominantly from basaltic andesite to andesite melts) and upper-crustal, low-Al amphibole rims (crystallized from rhyolitic melt) document occasional recharge of a shallow silicic mush by a more mafic melt from a lower-crustal reservoir. The sudden appearance of medium-Al amphiboles enriched in incompatible trace elements in eruptive periods younger than 2900 years B.P. is associated with a change in reservoir conditions towards hotter and drier magmas, which indicates recharge of the shallow silicic reservoir by basaltic melt enriched in incompatible elements. Deep-crystallizing, high-Al amphibole, however, appears mostly unaffected by such incompatible-element-enriched basaltic recharge, suggesting that these basalts bypass the lower crustal reservoir. This could be the result of the eastward offset position of the lower crustal reservoir relative to the upper crustal storage zone underneath the MSH edifice. Amphibole has proven to be a sensitive geochemical archive for uncovering storage conditions of magmas at Mount St. Helens. In agreement with geophysical observations, storage and differentiation have occurred in two main zones: an upper crustal and lower crustal reservoir (the lower one being chemically less evolved). The upper crustal silicic reservoir, offset to the west of the lower crustal reservoir, has captured compositionally unusual mafic recharge (drier, hotter, and enriched in incompatible trace elements in comparison to the typical parental magmas in the region), resulting in an increased chemical diversity of amphiboles and their carrier intermediate magmas, in the last ~3000 years of Mount St. Helens’s volcanic record.","PeriodicalId":16751,"journal":{"name":"Journal of Petrology","volume":"48 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2024-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139412699","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Oligocene high-MgO alkali basalts in central Tibet: implications for magma–mush mixing and mantle processes 西藏中部渐新世高氧化镁碱性玄武岩:对岩浆-岩浆混合和地幔过程的影响
IF 3.9 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS Pub Date : 2023-12-15 DOI: 10.1093/petrology/egad091
Yue Qi, Qiang Wang, Gang-Jian Wei, Xiu-Zheng Zhang, Wei Dan, Zong-Yong Yang, Lu-Lu Hao, Wan-Long Hu
High-MgO (> 9 wt.%) basaltic rocks can be primary magmas and used to constrain the geochemistry and temperature of the mantle. However, high MgO contents can also result from mixing between evolved melts and antecrysts or xenocrysts, and thus the whole-rock composition might not represent the solidified equivalents of primary magma. Whether such mixing with crystals can result in erroneous interpretations of mantle processes remains unclear. This study presents a petrological and geochemical investigation of the post-collision high-MgO (> 9 wt.%) Lugu volcanic rocks in the southern Qiangtang terrane, central Tibet. The Lugu volcanic rocks comprise porphyritic and intersertal alkali basalts. Zircon U–Pb ages and 40Ar/39Ar dating suggest that the two types of alkali basalts were erupted at ca. 29 Ma. Based on detailed petrographic observations and geochemical analysis, the porphyritic alkali basalts may represent near-primary melts, which are characterised by low SiO2 contents (40.9–45.1 wt.%), high CaO/Al2O3 ratios (1.1–1.5), and arc-like trace element patterns. We suggest these basalts were derived by partial melting of enriched garnet peridotite (> 3GPa) in the presence of H2O and CO2. These geochemical features are different from those of the ca. 30 Ma (ultra)-potassic rocks in the Qiangtang terrane, indicating that heterogeneous lithospheric mantle existed beneath the Qiangtang terrane during the Oligocene. In contrast, although the intersertal alkali basalts have high MgO contents (> 9 wt.%), evidence from mineral chemistry indicates that whole-rock compositions of the intersertal alkali basalts represent mixtures of evolved residual melts and cumulate crystals. They were the product of polybaric fractional crystallisation and subsequent mixing of crystals and residual melts in a magmatic plumbing system. Furthermore, when intersertal alkali basalts are assumed to be primary melts, they would have been derived by partial melting of shallow (~2.5 GPa) CO2-poor pyroxenite or peridotite. These conditions are different from interpretations of the nature of mantle source and melting conditions for porphyritic alkali basalts. Our results highlight that the interpretation of petrogenetic processes should be preceded by detailed mineralogical investigations.
高氧化镁(> 9 wt.%)玄武岩可能是原生岩浆,并可用于制约地幔的地球化学和温度。然而,高氧化镁含量也可能是由于演化熔体与前晶或异晶之间的混合造成的,因此整个岩石的成分可能并不代表原生岩浆的凝固等同物。这种与晶体的混合是否会导致对地幔过程的错误解释,目前仍不清楚。本研究对西藏中部羌塘地层南部的碰撞后高氧化镁(> 9 wt.%)鲁古火山岩进行了岩石学和地球化学研究。泸沽火山岩由斑岩和岩间碱性玄武岩组成。锆石U-Pb年龄和40Ar/39Ar年代测定表明,这两种类型的碱性玄武岩喷发于约29Ma。根据详细的岩石学观察和地球化学分析,斑状碱性玄武岩可能代表近原生熔融体,其特征是二氧化硅含量低(40.9-45.1 wt.%)、氧化钙/氧化铝比率高(1.1-1.5)以及类似弧形的微量元素模式。我们认为这些玄武岩是由富集的石榴石橄榄岩(> 3GPa)在 H2O 和 CO2 的作用下部分熔融而形成的。这些地球化学特征不同于约这些地球化学特征与羌塘地层中的约30Ma(超)钾盐岩不同,表明在渐新世时期,羌塘地层下存在着异质岩石圈地幔。相比之下,虽然岩间碱性玄武岩的氧化镁含量较高(> 9 wt.%),但矿物化学证据表明,岩间碱性玄武岩的全岩成分是演化残余熔体和积晶的混合物。它们是多巴分段结晶以及随后在岩浆管道系统中晶体和残余熔体混合的产物。此外,如果假定深成岩间碱性玄武岩是原生熔体,那么它们应该是由浅(~2.5 GPa)CO2贫乏的辉长岩或橄榄岩部分熔化而成的。这些条件与对斑状碱性玄武岩的地幔源性质和熔融条件的解释不同。我们的研究结果突出表明,在解释岩石成因过程之前,应先进行详细的矿物学研究。
{"title":"Oligocene high-MgO alkali basalts in central Tibet: implications for magma–mush mixing and mantle processes","authors":"Yue Qi, Qiang Wang, Gang-Jian Wei, Xiu-Zheng Zhang, Wei Dan, Zong-Yong Yang, Lu-Lu Hao, Wan-Long Hu","doi":"10.1093/petrology/egad091","DOIUrl":"https://doi.org/10.1093/petrology/egad091","url":null,"abstract":"High-MgO (> 9 wt.%) basaltic rocks can be primary magmas and used to constrain the geochemistry and temperature of the mantle. However, high MgO contents can also result from mixing between evolved melts and antecrysts or xenocrysts, and thus the whole-rock composition might not represent the solidified equivalents of primary magma. Whether such mixing with crystals can result in erroneous interpretations of mantle processes remains unclear. This study presents a petrological and geochemical investigation of the post-collision high-MgO (> 9 wt.%) Lugu volcanic rocks in the southern Qiangtang terrane, central Tibet. The Lugu volcanic rocks comprise porphyritic and intersertal alkali basalts. Zircon U–Pb ages and 40Ar/39Ar dating suggest that the two types of alkali basalts were erupted at ca. 29 Ma. Based on detailed petrographic observations and geochemical analysis, the porphyritic alkali basalts may represent near-primary melts, which are characterised by low SiO2 contents (40.9–45.1 wt.%), high CaO/Al2O3 ratios (1.1–1.5), and arc-like trace element patterns. We suggest these basalts were derived by partial melting of enriched garnet peridotite (> 3GPa) in the presence of H2O and CO2. These geochemical features are different from those of the ca. 30 Ma (ultra)-potassic rocks in the Qiangtang terrane, indicating that heterogeneous lithospheric mantle existed beneath the Qiangtang terrane during the Oligocene. In contrast, although the intersertal alkali basalts have high MgO contents (> 9 wt.%), evidence from mineral chemistry indicates that whole-rock compositions of the intersertal alkali basalts represent mixtures of evolved residual melts and cumulate crystals. They were the product of polybaric fractional crystallisation and subsequent mixing of crystals and residual melts in a magmatic plumbing system. Furthermore, when intersertal alkali basalts are assumed to be primary melts, they would have been derived by partial melting of shallow (~2.5 GPa) CO2-poor pyroxenite or peridotite. These conditions are different from interpretations of the nature of mantle source and melting conditions for porphyritic alkali basalts. Our results highlight that the interpretation of petrogenetic processes should be preceded by detailed mineralogical investigations.","PeriodicalId":16751,"journal":{"name":"Journal of Petrology","volume":"10 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2023-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138692375","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Connecting the dots: the lava domes’ perspective of magmatism related to an ignimbrite flare-up 连点成线:熔岩穹丘透视与火成岩爆发有关的岩浆活动
IF 3.9 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS Pub Date : 2023-12-14 DOI: 10.1093/petrology/egad090
L Smithies Sarah, M Gravley Darren, A R Gualda Guilherme
Dome eruptions associated with rhyolitic calderas offer an important insight into how extremely large (>>10 km3), rhyolitic magma systems are constructed through time. We focus on rhyolitic calderas in the central Taupō Volcanic Zone leading to, during, and immediately following the 350 – 240 ka ignimbrite flare-up. We identified 103 dome eruptions that are dated between ca. 650 and 150 ka and collated 239 literature whole-rock compositions from these domes. For each composition, we modelled the pressure of magma extraction from the magma mush and the mineral assemblage of the mush using the rhyolite-MELTS geobarometer. We calculated extraction temperatures using zircon saturation geothermometry. We show that magmas are extracted from typically quartz-bearing magma mush at a wide range of depths (~50 – 425 MPa, ~2 – 16 km) and temperatures (~750 – ~850 °C). Throughout the central TVZ, there are two dominant extraction pressure modes at 1) 150 – 175 MPa and 2) 250 – 325 MPa, consistent with 1) the depth of the brittle-ductile transition (~6 km) and just below typical pre-eruptive storage depths of other TVZ magmas (100 – 150 MPa, ~4 – 6 km); and 2) partial melt regions imaged below ~8 km by previous geophysical studies. In some regions, there is a clear correlation between crustal structures, the depth of magma extraction, and the composition of the magmas. In the Whakamaru caldera, the domes erupted inside the caldera following caldera collapse are extracted from ~225 to ~350 MPa at ~810 °C and have orthopyroxene-bearing compositions dissimilar to the caldera-forming eruption. These domes are aligned along normal faults, suggesting that rifting creates pathways for magma extraction from a deeper mush rejuvenated by recharge. The domes erupted along the structural margins of the Whakamaru caldera have very evolved, hornblende-bearing compositions, similar to the caldera-forming eruption and shallow, colder extraction from ~100 – ~200 MPa at ~770 °C, suggesting the mush feeding these domes is a remnant of the older caldera-forming magma system mobilised along the caldera-bounding faults. Two structural levels of magma extraction at ~6 km and 9 – 12 km are persistent throughout the flare-up period and across the central TVZ region, demonstrating the need for further investigation into the factors controlling the depth of mush development.
与流纹岩火山口相关的穹顶喷发为了解超大型(10 km3)流纹岩岩浆系统是如何随着时间的推移而形成的提供了重要的视角。我们重点研究了在350-240 ka火成岩爆发之前、期间和紧随其后的陶波火山带中部的流纹岩火山口。我们确定了约 650 至 150 ka 之间的 103 次穹隆喷发,并整理了来自这些穹隆的 239 份文献全岩成分。对于每种成分,我们都使用流纹岩-MELTS测地仪模拟了从岩浆泥浆中提取岩浆的压力以及岩浆泥浆的矿物组合。我们使用锆石饱和地热仪计算了萃取温度。我们的研究表明,岩浆从典型的含石英岩浆泥浆中提取的深度(~50 - 425 MPa,~2 - 16 km)和温度(~750 - ~850 °C)范围很广。在整个 TVZ 中心区,有两种主要的萃取压力模式:1)150 - 175 MPa;2)250 - 325 MPa,这与 1)脆性-韧性转变深度(~6 千米)和略低于其他 TVZ 岩浆典型的爆发前储存深度(100 - 150 MPa,~4 - 6 千米)相一致;以及 2)以前的地球物理研究在 ~8 千米以下成像的部分熔融区域相一致。在某些地区,地壳结构、岩浆提取深度和岩浆成分之间存在明显的相关性。在Whakamaru破火山口,破火山口坍塌后在破火山口内部喷发的圆顶是在约810 °C的温度下从约225至约350兆帕斯卡的压力下提取的,其成分与形成破火山口的喷发成分不同。这些穹隆沿着正断层排列,表明断裂为岩浆从补给恢复活力的深层熔岩中提取创造了通道。沿Whakamaru火山口构造边缘喷发的穹隆具有与形成火山口的喷发相似的非常进化的、含角闪石的成分,以及在~770 °C、~100 - ~200 MPa的较浅、较冷的萃取,这表明为这些穹隆提供营养的岩浆是沿火山口边界断层移动的形成火山口的较古老岩浆系统的残余。在整个爆发期和整个TVZ中部地区,岩浆萃取的两个结构层次(约6千米和9-12千米)持续存在,这表明有必要进一步研究控制蘑菇云发展深度的因素。
{"title":"Connecting the dots: the lava domes’ perspective of magmatism related to an ignimbrite flare-up","authors":"L Smithies Sarah, M Gravley Darren, A R Gualda Guilherme","doi":"10.1093/petrology/egad090","DOIUrl":"https://doi.org/10.1093/petrology/egad090","url":null,"abstract":"Dome eruptions associated with rhyolitic calderas offer an important insight into how extremely large (>>10 km3), rhyolitic magma systems are constructed through time. We focus on rhyolitic calderas in the central Taupō Volcanic Zone leading to, during, and immediately following the 350 – 240 ka ignimbrite flare-up. We identified 103 dome eruptions that are dated between ca. 650 and 150 ka and collated 239 literature whole-rock compositions from these domes. For each composition, we modelled the pressure of magma extraction from the magma mush and the mineral assemblage of the mush using the rhyolite-MELTS geobarometer. We calculated extraction temperatures using zircon saturation geothermometry. We show that magmas are extracted from typically quartz-bearing magma mush at a wide range of depths (~50 – 425 MPa, ~2 – 16 km) and temperatures (~750 – ~850 °C). Throughout the central TVZ, there are two dominant extraction pressure modes at 1) 150 – 175 MPa and 2) 250 – 325 MPa, consistent with 1) the depth of the brittle-ductile transition (~6 km) and just below typical pre-eruptive storage depths of other TVZ magmas (100 – 150 MPa, ~4 – 6 km); and 2) partial melt regions imaged below ~8 km by previous geophysical studies. In some regions, there is a clear correlation between crustal structures, the depth of magma extraction, and the composition of the magmas. In the Whakamaru caldera, the domes erupted inside the caldera following caldera collapse are extracted from ~225 to ~350 MPa at ~810 °C and have orthopyroxene-bearing compositions dissimilar to the caldera-forming eruption. These domes are aligned along normal faults, suggesting that rifting creates pathways for magma extraction from a deeper mush rejuvenated by recharge. The domes erupted along the structural margins of the Whakamaru caldera have very evolved, hornblende-bearing compositions, similar to the caldera-forming eruption and shallow, colder extraction from ~100 – ~200 MPa at ~770 °C, suggesting the mush feeding these domes is a remnant of the older caldera-forming magma system mobilised along the caldera-bounding faults. Two structural levels of magma extraction at ~6 km and 9 – 12 km are persistent throughout the flare-up period and across the central TVZ region, demonstrating the need for further investigation into the factors controlling the depth of mush development.","PeriodicalId":16751,"journal":{"name":"Journal of Petrology","volume":"28 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2023-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138692193","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
期刊
Journal of Petrology
全部 Acc. Chem. Res. ACS Applied Bio Materials ACS Appl. Electron. Mater. ACS Appl. Energy Mater. ACS Appl. Mater. Interfaces ACS Appl. Nano Mater. ACS Appl. Polym. Mater. ACS BIOMATER-SCI ENG ACS Catal. ACS Cent. Sci. ACS Chem. Biol. ACS Chemical Health & Safety ACS Chem. Neurosci. ACS Comb. Sci. ACS Earth Space Chem. ACS Energy Lett. ACS Infect. Dis. ACS Macro Lett. ACS Mater. Lett. ACS Med. Chem. Lett. ACS Nano ACS Omega ACS Photonics ACS Sens. ACS Sustainable Chem. Eng. ACS Synth. Biol. Anal. Chem. BIOCHEMISTRY-US Bioconjugate Chem. BIOMACROMOLECULES Chem. Res. Toxicol. Chem. Rev. Chem. Mater. CRYST GROWTH DES ENERG FUEL Environ. Sci. Technol. Environ. Sci. Technol. Lett. Eur. J. Inorg. Chem. IND ENG CHEM RES Inorg. Chem. J. Agric. Food. Chem. J. Chem. Eng. Data J. Chem. Educ. J. Chem. Inf. Model. J. Chem. Theory Comput. J. Med. Chem. J. Nat. Prod. J PROTEOME RES J. Am. Chem. Soc. LANGMUIR MACROMOLECULES Mol. Pharmaceutics Nano Lett. Org. Lett. ORG PROCESS RES DEV ORGANOMETALLICS J. Org. Chem. J. Phys. Chem. J. Phys. Chem. A J. Phys. Chem. B J. Phys. Chem. C J. Phys. Chem. Lett. Analyst Anal. Methods Biomater. Sci. Catal. Sci. Technol. Chem. Commun. Chem. Soc. Rev. CHEM EDUC RES PRACT CRYSTENGCOMM Dalton Trans. Energy Environ. Sci. ENVIRON SCI-NANO ENVIRON SCI-PROC IMP ENVIRON SCI-WAT RES Faraday Discuss. Food Funct. Green Chem. Inorg. Chem. Front. Integr. Biol. J. Anal. At. Spectrom. J. Mater. Chem. A J. Mater. Chem. B J. Mater. Chem. C Lab Chip Mater. Chem. Front. Mater. Horiz. MEDCHEMCOMM Metallomics Mol. Biosyst. Mol. Syst. Des. Eng. Nanoscale Nanoscale Horiz. Nat. Prod. Rep. New J. Chem. Org. Biomol. Chem. Org. Chem. Front. PHOTOCH PHOTOBIO SCI PCCP Polym. Chem.
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
0
微信
客服QQ
Book学术公众号 扫码关注我们
反馈
×
意见反馈
请填写您的意见或建议
请填写您的手机或邮箱
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
Book学术官方微信
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术
文献互助 智能选刊 最新文献 互助须知 联系我们:info@booksci.cn
Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。
Copyright © 2023 Book学术 All rights reserved.
ghs 京公网安备 11010802042870号 京ICP备2023020795号-1