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Study of the rupture processes of the 1989 (Mw 6.9) and 2021 (Mw 7.0) Guerrero earthquakes using teleseismic records: Sismotectonic implications 利用远震记录研究1989年(Mw 6.9)和2021年(Mw 7.0)格雷罗地震的破裂过程:地壳构造意义
4区 地球科学 Q2 GEOLOGY Pub Date : 2023-10-31 DOI: 10.1344/geologicaacta2023.21.9
Rosario Martínez
Slip models of the April 25, 1989 (Mw 6.9) earthquake and the Acapulco earthquake of September 8, 2021 (Mw 7.0) were determined to analyze its rupture zone and understand the relationship of interplate earthquakes in the Acapulco–San Marcos subduction zone. For both events, velocity P and SH waves recorded at teleseismic distances were modeled. For the 1989 San Marcos event, two slip zones were determined with a maximum slip of 121cm, a stress drop of 8bars and a rupture duration of approximately 13s. This event showed a complex rupture. For the 2021 Acapulco event, a zone of maximum slip of 267cm, a stress drop of 5bars, and a rupture duration of approximately 24s were determined. Analysis of rupture zones suggests that complex events occur in the Acapulco–San Marcos subduction zone. Therefore, these results have important implications in seismic potential studies since the source parameters are critical.
利用1989年4月25日(Mw 6.9)地震和2021年9月8日(Mw 7.0)阿卡普尔科地震的滑动模型分析了其破裂带,并了解了阿卡普尔科-圣马科斯俯冲带的板块间地震关系。对于这两个事件,在远震距离记录的速度P波和SH波进行了模拟。在1989年的圣马科斯地震中,确定了两个滑移带,最大滑移量为121厘米,应力降为8巴,破裂持续时间约为13秒。这一事件显示了一次复杂的破裂。对于2021年的阿卡普尔科事件,确定了最大滑移区为267厘米,应力降为5巴,破裂持续时间约为24秒。对破裂带的分析表明,在阿卡普尔科-圣马科斯俯冲带发生了复杂的事件。因此,这些结果对地震潜力研究具有重要意义,因为震源参数是至关重要的。
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引用次数: 0
Understanding the spatio-temporal evolution of fractures in pillow basalt 枕状玄武岩裂缝时空演化研究
4区 地球科学 Q2 GEOLOGY Pub Date : 2023-10-06 DOI: 10.1344/geologicaacta2023.21.8
Tridib Mondal, Sourav Mondal, Sirshendu Biswas, Gourav Das
We investigated the origin and spatio-temporal evolution of cooling fractures in pillow basalt which undergo thermal contraction after their eruption in an aqueous environment. Through a computer-based simulation using Fourier transformation, the thermo elastic stress displacement profiles within individual pillow units are determined. The scaled model (pillow diameter - 1 meter) generated radial, linear fractures perpendicular to pillow margin and irregular discrete flaws in the pillow interior like the ones observed in natural examples. Radial linear fractures of 3–5 centimetre in length have been measured in pillows of average one-metre diameter from the Maradihalli region, in the Chitradurga Schist Belt, India. An estimated time of 94–118 minutes was required to get radial fractures of similar length in the simulation. Our model efficiently replicated the generation and distribution of thermal fractures and allowed an estimation of cooling time for the peripheral glassy zone but has limitations in deciphering the formation of fracture networks in progressively crystalline inner zone of pillows.
研究了枕状玄武岩冷却裂缝在水环境下喷发后发生热收缩的成因及时空演化规律。通过傅里叶变换的计算机模拟,确定了单个枕单元内的热弹性应力位移曲线。比例模型(枕头直径- 1米)产生垂直于枕头边缘的径向线状裂缝和枕头内部不规则的离散缺陷,与自然例子中观察到的相似。在印度Chitradurga片岩带的Maradihalli地区,在平均直径为1米的枕头中测量到了长度为3-5厘米的径向线性裂缝。在模拟中,估计需要94-118分钟的时间来获得相似长度的桡骨裂缝。我们的模型有效地复制了热裂缝的产生和分布,并允许估计外围玻璃化区域的冷却时间,但在解释枕头逐渐结晶的内部区域裂缝网络的形成方面存在局限性。
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引用次数: 0
Devonian-Mississippian faulting controlled by WNW-ESE-striking structural grain in Proterozoic basement rocks in Billefjorden, central Spitsbergen 斯匹次卑尔根中部Billefjorden地区元古界基底中受西北西东向构造颗粒控制的泥盆纪-密西西比期断裂
IF 1.5 4区 地球科学 Q2 GEOLOGY Pub Date : 2023-07-28 DOI: 10.1344/geologicaacta2023.21.7
Jean-Baptiste P. Koehl, Gard Christophersen, M. Collombin, Christoffer Taule, Eirik M.B. Stokmo, Lis Allaart
In Billefjorden, central Spitsbergen, Devonian collapse and Carboniferous rift-related sedimentary strata were deposited unconformably over Proterozoic basement rocks displaying well developed N-S-trending Caledonian grain. Caledonian structures and fabrics are thought to have controlled the location and trend of subsequent Devonian and Carboniferous basin-bounding faults like the Billefjorden fault zone and Lemströmfjellet–Løvehovden fault. However, fieldwork and interpretation of aerial photographs in Proterozoic basement rocks reveal the existence of steep, abundant, WNW-ESE-striking brittle faults that are sub-orthogonal to known major Caledonian and post-Caledonian structures in Billefjorden, but that do not extend into adjacent-overlying, rift-related, Pennsylvanian rocks of the Gipsdalen Group. Structural analysis of field data and aerial photographs suggest that WNW-ESE-striking faults in basement rocks in Billefjorden formed as (sinistral) strike-slip and normal faults during Devonian-Mississippian extension in agreement with previously inferred models of sinistral transtension. The abundance of these faults suggest that their formation was controlled by analogously trending, preexisting structural grain (planar anisotropies) at depth, and their pronounced WNW-ESE strike suggest that the strike of preexisting anisotropies were comparable to recently identified, crustal-scale, WNW-ESE-striking Timanian thrust systems in Svalbard and the northern Barents Sea.
在斯匹次卑尔根中部的Billefjorden,泥盆纪崩塌和石炭纪裂谷相关沉积地层不整合地沉积在元古代基岩上,显示出发育良好的南北走向加里东晶粒。加里东构造和组构被认为控制了随后的泥盆纪和石炭纪盆地边界断层的位置和走向,如Billefjorden断层带和Lemströmfjellet–Løvehovden断层。然而,对元古代基岩的实地调查和航空照片的解释表明,存在陡峭、丰富、西西西-东东东走向的脆性断层,这些断层与Billefjorden已知的主要加里东期和后加里东期构造次正交,但没有延伸到Gipsdalen群的相邻上覆裂谷相关宾夕法尼亚岩中。现场数据和航空照片的结构分析表明,Billefjorden基岩中的WNW ESE走向断层在泥盆纪-密西西比伸展期间形成为(左旋)走滑和正断层,与先前推断的左旋平移模型一致。这些断层的丰度表明,它们的形成是由类似的趋势控制的,在深度上预先存在的结构颗粒(平面各向异性),其明显的WNW-ESE走向表明,预先存在的各向异性的走向与最近发现的斯瓦尔巴群岛和巴伦支海北部的地壳规模的WNW-ESE走向Timanian逆冲系统相当。
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引用次数: 0
Origin and evolution of Neoproterozoic metaophiolitic mantle rocks from the eastern Desert of Egypt: Implications for tectonic and metamorphic events in the Arabian-Nubian Shield 埃及东部沙漠新元古代变质岩的起源和演化:对阿拉伯-努比亚地盾构造和变质事件的启示
IF 1.5 4区 地球科学 Q2 GEOLOGY Pub Date : 2023-07-17 DOI: 10.1344/geologicaacta2023.21.6
Shehata Ali, M. Azer, A. Abdel-Karim
The mantle rocks from Kadaboura and Madara areas represent sections of dismembered ophiolitic complexes developed during the Neoproterozoic in the Eastern Desert of Egypt, which is located in the northwestern corner of the Arabian–Nubian Shield. The Kadaboura mantle rocks comprise serpentinites and serpentinized dunites, whereas those of the Madara consist of serpentinites and serpentinized pyroxenites.Despite the serpentinization of the studied mantle rocks, few relicts of primary chromite, olivine and pyroxene are preserved. Chromite is partly altered having unaltered Al-rich chromite cores surrounded by Fe-rich chromite and Cr-rich magnetite rims. The unaltered Al-rich chromite cores show compositions equilibrated at temperatures mostly below ~500-600°C, which is a temperature comparable to that estimated for primary chromite in greenschist up to lower amphibolite facies rocks. The high Cr# [100×Cr/(Cr+Al)= 47-76] of the unaltered chromite cores and the Mg-rich nature of the olivine relicts (Fo91–94) indicate that the studied mantle rocks were produced from a highly depleted mantle that experienced high degrees of melt extraction (mostly ~30-40%). This range of melt extraction resembles that estimated for supra-subduction zone peridotites, but higher than that in abyssal and passive margin peridotites. Furthermore, the clinopyroxene relicts show compositions comparable to those from the Mariana forearc peridotites. Bulk-rock geochemistry also reflects derivation from an extremely depleted and a highly refractory mantle source. Modelling of rare-earth elements suggests that the studied mantle rocks were possibly formed by the interaction of their highly depleted harzburgitic mantle precursors with subduction-related melts/fluids during their evolution in a fore-arc basin of the supra-subduction zone.The proposed geodynamic model suggests that the oceanic lithosphere generated during the seafloor spreading of the Mozambique Ocean was emplaced in the upper plate of the intra-oceanic subduction zone, in which the formely depleted Neoproterozoic mantle of the Arabian-Nubian Shield experienced mature phases of hydrous melting, extreme depletion and enrichment.
Kadabura和Madara地区的地幔岩代表了埃及东部沙漠新元古代发育的肢解蛇绿岩杂岩的部分,该地区位于阿拉伯-努比亚地盾的西北角。Kadabura地幔岩由蛇纹岩和蛇纹石化纯岩组成,而Madara地幔岩则由蛇纹石和蛇纹化辉石岩组成。尽管所研究的地幔岩石存在蛇纹石化,但很少保留原生铬铁矿、橄榄石和辉石的残余。铬铁矿部分蚀变,具有未改变的富铝铬铁矿核心,周围为富铁铬铁矿和富铬磁铁矿边缘。未经改变的富铝铬铁矿岩芯显示,其成分在主要低于500-600°C的温度下达到平衡,这一温度与绿片岩至下角闪岩相岩石中原生铬铁矿的估计温度相当。未改变的铬铁矿岩芯的高Cr#[100×Cr/(Cr+Al)=47-76]和橄榄石残余物的富镁性质(Fo91–94)表明,所研究的地幔岩石是由经历了高度熔融提取(大部分约为30-40%)的高度贫化地幔产生的。这种熔体提取范围与超俯冲带橄榄岩的估计范围相似,但高于深海和被动边缘橄榄岩的熔体提取范围。此外,斜辉石残余物的成分与马里亚纳弧前橄榄岩的成分相当。大块岩石地球化学也反映了源自极度枯竭和高度难熔的地幔源。稀土元素的建模表明,所研究的地幔岩可能是由其高度贫化的方辉橄榄岩地幔前体在超俯冲带弧前盆地演化过程中与俯冲相关的熔体/流体相互作用形成的。所提出的地球动力学模型表明,莫桑比克洋海底扩张过程中产生的海洋岩石圈被侵位在洋内俯冲带的上板块,在该俯冲带中,阿拉伯-努比亚地盾的前贫化新元古代地幔经历了含水熔融、极端贫化和富集的成熟阶段。
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引用次数: 0
Tectonic and lithologic controls on the landscape adjustment along the eastern terrain of the Mae Tha fault, northern Thailand 泰国北部梅塔断层东部地形景观调整的构造和岩性控制
IF 1.5 4区 地球科学 Q2 GEOLOGY Pub Date : 2023-07-04 DOI: 10.1344/geologicaacta2023.21.4
Pichawut Manopkawee, N. Mankhemthong, Chanin Pattarakamolsen
Understanding the interaction between tectonics, climatically-driven surficial processes, and bedrock erodibilityprovides insight into how the landscape develops over space and time. Although numerous active faults, lithologicand climatic variability control the landscape across Northern Thailand, the influence of these factors on thespatial adjustment of a dynamic landscape is largely unknown. In the study, we focus on lower-order channelsdeveloped across the eastern terrain of the Mae Tha fault, in which spatial variability in rock mass quality and faultcharacteristics strongly control the landscape. We combine topographic data analysis from channel profiles andgeologic field observations to determine variations in bedrock watershed characteristics and any linear structuresacross the site. Our results reveal that channels in the northern and central zones of the terrain are relatively steeperbecause a west-dipping fault controls them with less fracture density of granite. Channels in the south, however,are less steep as an oblique-slip fault governs their profiles with a higher fracture density of bedrock. Moreover,channels flowing across different lithologic bedrocks exhibit steeper channel profiles than channels developed inuniform lithology. Our study highlights the use of topographic adjustment as one of the efficient tools to describethe dynamics of active deformation on the landscape over space and time. According to the mutual analysis, ourfinding suggests that lithologic resistance and spatial differences in fault lineaments ultimately control charactersof channel profiles and overall landscape topography.
了解构造、气候驱动的地表过程和基岩可蚀性之间的相互作用,可以深入了解景观如何在空间和时间上发展。尽管许多活动断层、岩性和气候变化控制着泰国北部的景观,但这些因素对动态景观的空间调整的影响在很大程度上是未知的。在这项研究中,我们重点关注Mae Tha断层东部地形上发育的低阶通道,其中岩体质量和断层特征的空间变异性强烈控制着景观。我们将河道剖面的地形数据分析和地质现场观测相结合,以确定基岩流域特征的变化以及现场附近的任何线性结构。我们的研究结果表明,地形北部和中部地带的通道相对陡峭,因为向西倾斜的断层控制着它们,花岗岩的断裂密度较小。然而,南部的河道不那么陡峭,因为倾斜滑动断层的剖面具有更高的基岩断裂密度。此外,流经不同岩性基岩的河道比发育不均匀岩性的河道具有更陡的河道剖面。我们的研究强调,地形平差是描述景观在空间和时间上主动变形动力学的有效工具之一。根据相互分析,我们的发现表明,岩性阻力和断层线的空间差异最终控制了河道剖面和整体景观地形的特征。
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引用次数: 0
New evidence for late Eocene-early Oligocene uplift of Aves Ridge and paleogeography of GAARlandia 埃夫斯岭晚始新世-早渐新世隆升与GAARlandia古地理的新证据
IF 1.5 4区 地球科学 Q2 GEOLOGY Pub Date : 2023-06-29 DOI: 10.1344/geologicaacta2023.21.5
Manuel Antonio Iturralde Vinent, Ross D.E.
The GAARlandia hypothesis has produced vigorous debate among biologists regarding whether now-submerged landforms that existed in the Caribbean region during the late Paleogene might have acted as a barrier for marine organisms and as a bridge for terrestrial biotas migrating from South America into the Greater Antilles. This concept derived from the hypothesized emergence history of the Aves Ridge. In the quarter century since GAARlandia was first proposed, new paleontological, geological and geophysical information has greatly extended the database available. Here we reaffirm that GAARlandia was a positive topographic feature from middle Eocene, and was exposed above sea level between late Eocene and early Oligocene when it facilitated biotic colonization of the northern Greater Antilles and their satellite islands, whether as a series of closely spaced islands or as a continuous peninsula projecting from northeastern South America along the crown of the rise.
GAARlandia假说在生物学家中引发了激烈的争论,争论的焦点是古近纪晚期存在于加勒比海地区的淹没地貌是否可能成为海洋生物的屏障,以及陆地生物从南美洲迁移到大安的列斯群岛的桥梁。这个概念来源于假设的Aves山脊的出现历史。自从GAARlandia首次被提出以来的四分之一个世纪里,新的古生物学、地质和地球物理信息极大地扩展了可用的数据库。在这里,我们重申,GAARlandia是始新世中期的一个积极地形特征,在始新世晚期和渐新世早期暴露在海平面以上,当时它促进了大安的列斯群岛北部及其卫星岛的生物殖民化,无论是作为一系列间隔紧密的岛屿,还是作为一个从南美洲东北部沿着山脊突出的连续半岛。
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引用次数: 0
Early Cretaceous coastal lake Konservat-Lagerstätte of La Pedrera de Meià (Southern Pyrenees) 早白垩世La Pedrera de Meià海岸湖Konservat Lagerstätte(比利牛斯山脉南部)
IF 1.5 4区 地球科学 Q2 GEOLOGY Pub Date : 2023-04-17 DOI: 10.1344/geologicaacta2023.21.3
A. Gil-Delgado, X. Delclòs, A. Sellés, À. Galobart, O. Oms
A state of the art of the Barremian Konservat-Lagerstätte of la Pedrera de Meià site (Southern Pyrenees) is compiled here including the acquisition of new geological data. The relevance of this site, together with the nearby la Cabroa site, is due to its paleobiotic richness and the fact that 113 holotypes and paratypes of flora and fauna have already been defined. Since its discovery at the end of the 19th century and its exploitation as a lithographic limestone quarry, the site has been the object of paleontological interest by national and foreign research teams that are summarized here (including the catalogue of 223 publications). A survey of the existing type specimens in collections all over Europe is also provided, being France and Germany, the countries where more fossils are hosted other than Spain. The geological frame of this site is also reviewed, by revisiting unpublished geological mappings (mainly that of Krusat, 1966) and integrating it in a comprehensive map that includes 4 revisited outcrops of lithographic limestone which could be potential paleontological sites. The available stratigraphic sections did allow the precise location of paleontological data and findings and environmental proxies. The stratigraphic sections obtained have a thickness of about 50m and contain a minimum of 40.000 limestone layers, being an approximation of the years represented in the la Pedrera de Meià site, and the time expanded of the lake during the Barremian.
这里汇编了la Pedrera de Meià遗址(南比利牛斯山)的Barremian Konservat Lagerstätte的最新技术,包括获取新的地质数据。该遗址与附近的拉卡布罗遗址的相关性是由于其古生物的丰富性,以及已经确定了113种动植物的正模和副模。自19世纪末被发现并被开发为石版石灰石采石场以来,该遗址一直是国内外研究团队关注的古生物学对象,本文对此进行了总结(包括223份出版物目录)。还对欧洲各地收藏的现有模式标本进行了调查,包括法国和德国,这两个国家的化石数量比西班牙多。还通过重新查阅未发表的地质图(主要是Krusat,1966年的地质图)并将其整合在一张综合地图中,对该遗址的地质框架进行了审查,该地图包括4个重新查阅的石版石灰岩露头,这些露头可能是潜在的古生物遗址。可用的地层剖面确实允许精确定位古生物数据和发现以及环境指标。所获得的地层剖面厚度约为50米,至少包含40.000个石灰岩层,近似于la Pedrera de Meià遗址的年份,以及Barremian时期湖泊的时间扩展。
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引用次数: 0
The elusive crustal resistive boundary beneath the Deccan Volcanic Province and the western Dharwar craton, India 印度德干火山省和达瓦尔克拉通西部下方难以捉摸的地壳电阻边界
IF 1.5 4区 地球科学 Q2 GEOLOGY Pub Date : 2023-03-23 DOI: 10.1344/geologicaacta2023.21.2
Pratap Akkapolu, Pradeep Naick Bukke, K. K, R. Paluri, Naganjaneyulu Kasturi
The electrical properties of the boundary beneath the Deccan Volcanic Province and the western Dharwar craton are imaged by using the magnetotelluric method. The magnetotelluric study was carried out along a 150km long WNW-ESE profile from Belgaum (in the Deccan Volcanic Province) to Haveri (in the western Dharwar craton).Data from 19 magnetotelluric stations spaced 10-15km apart were used. The dominant regional geo-electric strike direction obtained is N20ºE. Two-dimensional (2-D) inversion is done by using the non-linear conjugate gradient scheme for both apparent resistivity and phase. The 2-D resistivity model shows a high electrical resistivity character (>10,000ohm-m) in the western Dharwar craton. Two conductive anomalies are mapped in the crustal region. In the WNW side of the profile, a conductive feature (~200ohm-m) is imaged in the mid-lower crust and, in the central part of the profile another conductive feature is mapped in the lower crust. The conductive features robustness is tested using linear and non-linear sensitivity analyses. The conductor mapped in the WNW part of the profile is considered as a deep seated fault representing a boundary or a rift related feature beneath the Deccan Volcanic Province and the western Dharwar craton. A zone of enhanced conductivity (<50ohm-m) at an approximate depth of 10-30km may represent the presence of the rift in the region. This conducting feature on the Western side of the E-W trending Kaladgi Basin can be interpreted as the extension of the Kaladgi Basin further west. A well-correlated geological cross-section is also derived to interpret the resistive features mapped in this study. The electrical resistivity nature of the crust is compared with other regions of the world.
使用大地电磁法对德干火山省和达尔瓦尔克拉通西部下方边界的电学性质进行了成像。大地电磁研究是沿着从Belgaum(位于德干火山省)到Haveri(位于达尔瓦尔克拉通西部)的150公里长的WNW-ESE剖面进行的。使用了间隔10-15km的19个大地电磁站的数据。获得的主导区域地电走向为N20ºE。采用视电阻率和相位的非线性共轭梯度格式进行二维反演。二维电阻率模型显示达尔瓦尔克拉通西部具有高电阻率特征(>10000ohm-m)。在地壳区域绘制了两个导电异常。在剖面的WNW侧,在中下地壳中成像了一个导电特征(~200ohm-m),在剖面的中心部分,在下地壳中映射了另一个导电特性。使用线性和非线性灵敏度分析来测试导电特征的稳健性。剖面WNW部分绘制的导体被认为是代表德干火山省和达瓦尔克拉通西部下方边界或裂谷相关特征的深层断层。在大约10-30km的深度处,导电性增强的区域(<50ohm-m)可能代表该区域存在裂谷。东西走向卡拉德吉盆地西侧的这种传导特征可以解释为卡拉德吉流域进一步向西的延伸。还推导了一个相关良好的地质剖面,以解释本研究中绘制的电阻特征。地壳的电阻率性质与世界其他地区进行了比较。
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引用次数: 2
Tectonic geomorphology of Bozdoğan and Karacasu grabens, western Anatolia 安纳托利亚西部Bozdoğan和Karacasu地堑的构造地貌
IF 1.5 4区 地球科学 Q2 GEOLOGY Pub Date : 2023-02-27 DOI: 10.1344/geologicaacta2023.21.1
E. Özsayın, K. Dirik, F. Ocakoğlu, Sanem Açıkalın Cartigny, Azad sağlam selcuk
Western Anatolia is one of the most rapidly extending and seismically active regions in the world. The circa N-S extension since the Early Miocene caused the formation of E-W trending major grabens and intervening horsts, having earthquake potentials with magnitude ≥5. The E-W oriented Büyük Menderes graben cross-cuts the broadly N-S oriented Bozdoğan and Karacasu grabens, of which the boundary faults of the latter are the source of seismic activity. Geomorphic indices, including drainage basin asymmetry, mountain front sinuosity, valley-floor width to valley height ratio, stream length-gradient index and normalized channel steepness index, were used to evaluate the boundary fault segments of the Bozdoğan and Karacasu grabens. The results indicate that both grabens are tectonically active and therefore regions of earthquake potential, consistent with the epicenters of earthquakes. Thus, it can be inferred that fault segments of second-order grabens, which are crosscut by the boundary faults of seismically active main depressions, are apparently reactivated by ongoing tectonism and may represent seismic activity. This suggestion applies also for similar basins located in the western Anatolia.
安纳托利亚西部是世界上延伸最快、地震最活跃的地区之一。早中新世以来的南北向伸展导致了东西走向的主要地堑和中间地垒的形成,具有≥5级的地震潜力。东西向的Büyük-Menderes地堑横切了大致南北向的Bozdoğan和Karacasu地堑,后者的边界断层是地震活动的来源。利用流域不对称性、山前弯度、谷底宽谷高比、河流长度梯度指数和归一化河道陡度指数等地貌指标对Bozdoğan和Karacasu地堑的边界断裂段进行了评价。结果表明,这两个地堑都是构造活跃的,因此具有地震潜力的区域,与震中一致。因此,可以推断,被地震活跃的主凹陷的边界断层横切的二阶地堑的断层段显然被正在进行的构造作用重新激活,并且可能代表地震活动。这一建议也适用于位于安纳托利亚西部的类似盆地。
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引用次数: 0
Detrital zircon similarities and dissimilarities between the Iberian Pyrite Belt, Ossa-Morena Zone and Meguma 伊比利亚黄铁矿带、Ossa-Morena带和Meguma的碎屑锆石异同
IF 1.5 4区 地球科学 Q2 GEOLOGY Pub Date : 2022-12-13 DOI: 10.1344/geologicaacta2022.20.16
João Lains Amaral, A. R. Solá, T. M. Bento dos Santos, M. Chichorro
Despite the so-called exotic nature of the South Portuguese Zone relatively to the other major domains of the Iberian Massif of peri-Gondwanan affinity, Devonian detrital rocks of the oldest strata in the Iberian Pyrite Belt have a remarkable resemblance with the Ossa-Morena Zone’s Neoproterozoic-Cambrian rocks and the West Meguma’s Cambrian-Ordovician rocks, presenting the so-called “West African signature”.
尽管相对于冈瓦纳大陆周围的伊比利亚地块的其他主要区域,南葡萄牙带具有所谓的奇异性质,但伊比利亚黄铁矿带最古老地层的泥盆纪碎屑岩与奥萨-莫雷纳带的新元古代寒武纪岩石和西梅古马的寒武纪-奥陶纪岩石有着显著的相似性,提出所谓的“西非签名”。
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引用次数: 3
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Geologica Acta
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