Benjamin L. Howard, Glenn R. Sharman, James L. Crowley, Ellen Reat Wersan
U–Pb dating of zircon via laser ablation‐inductively coupled plasma‐mass spectrometry (LA‐ICP‐MS) has become a primary method for determining the age of crystalline rocks and the provenance and maximum depositional age of (meta)sedimentary rocks. Although chemical abrasion has become a standard approach for mitigating Pb loss in zircon dated via high‐resolution thermal ionization mass spectrometry (CA‐TIMS), laser ablation dating is rarely accompanied by chemical abrasion. We evaluate the accuracy of U–Pb dates acquired via LA‐ICP‐MS relative to CA‐TIMS through analysis of a large database of paired analyses from the same zircon crystals. We show that laser ablation 206Pb/238U dates are systematically younger than their CA‐TIMS counterparts, with a greater shift in detrital zircon (−2.0%) versus igneous or metamorphic zircon (−0.9%). Although systematic biases related to “matrix effects” may be a contributing factor, our analysis suggests that unmitigated cryptic Pb loss is likely widespread in laser ablation U–Pb datasets.
{"title":"The leaky chronometer: Evidence for systematic cryptic Pb loss in laser ablation U‐Pb dating of zircon relative to CA‐TIMS","authors":"Benjamin L. Howard, Glenn R. Sharman, James L. Crowley, Ellen Reat Wersan","doi":"10.1111/ter.12742","DOIUrl":"https://doi.org/10.1111/ter.12742","url":null,"abstract":"U–Pb dating of zircon via laser ablation‐inductively coupled plasma‐mass spectrometry (LA‐ICP‐MS) has become a primary method for determining the age of crystalline rocks and the provenance and maximum depositional age of (meta)sedimentary rocks. Although chemical abrasion has become a standard approach for mitigating Pb loss in zircon dated via high‐resolution thermal ionization mass spectrometry (CA‐TIMS), laser ablation dating is rarely accompanied by chemical abrasion. We evaluate the accuracy of U–Pb dates acquired via LA‐ICP‐MS relative to CA‐TIMS through analysis of a large database of paired analyses from the same zircon crystals. We show that laser ablation <jats:sup>206</jats:sup>Pb/<jats:sup>238</jats:sup>U dates are systematically younger than their CA‐TIMS counterparts, with a greater shift in detrital zircon (−2.0%) versus igneous or metamorphic zircon (−0.9%). Although systematic biases related to “matrix effects” may be a contributing factor, our analysis suggests that unmitigated cryptic Pb loss is likely widespread in laser ablation U–Pb datasets.","PeriodicalId":22260,"journal":{"name":"Terra Nova","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141931497","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
David W. Valentino, Jeffrey R. Chiarenzelli, Teresa E. Jordan, Robert D. Jacobi, Alexander E. Gates
Besides a few isolated rift basins along the Neoproterozoic eastern Laurentian margin, the Appalachian Palaeozoic strata rest unconformably on Mesoproterozoic crystalline basement, reflecting a ca. 550+ Ma hiatus. However, a nearly 3 km deep experimental geothermal borehole through the Appalachian basin at Cornell University, New York, unexpectedly encountered deformed Neoproterozoic greenschist facies phyllites and metavolcanics (Cayuta Formation) beneath the Cambrian non‐conformity. Magnetic modelling shows they are in the 5000 km2 fault‐bounded Ithaca basin, proposed to be associated with Iapetan rifting. The volcanism and metamorphism appear linked to ca. 600–650 Ma thermal events related or unrelated to extension, but requiring uplift and denudation of 5–10 km of rock prior to deposition of the Cambrian Potsdam Group. The Ithaca basin is >350 km inboard of the Laurentian Iapetus margin, indicating a broad Neoproterozoic rift zone for at least the NY and PA portion of eastern Laurentia.
除了沿新新生代东劳伦伦大陆边缘的几个孤立的裂谷盆地外，阿巴拉契亚古生代地层不稳定地稳定在中新生代结晶基底上，反映了约 550+ Ma 的间断。然而，在纽约康奈尔大学穿过阿巴拉契亚盆地的一个近 3 千米深的实验性地热钻孔中，却意外地在寒武纪不整合地层下发现了变形的新元古代绿泥石面辉绿岩和变质火山岩（卡尤塔地层）。磁力模型显示，它们位于面积达 5000 平方公里、以断层为界的伊萨卡盆地，该盆地被认为与伊阿佩坦断裂有关。火山作用和变质作用似乎与约 600-650 Ma 的热事件有关，或与延伸无关，但在寒武纪波茨坦群沉积之前需要 5-10 km 岩石的隆起和剥蚀。伊萨卡盆地位于劳伦提斯Iapetus边缘内侧350千米处，这表明至少在纽约州和宾夕法尼亚州的劳伦提斯东部有一个宽广的新近纪断裂带。
{"title":"Deep borehole discoveries beneath the Appalachian Basin: Broad Rodinian rift and Neoproterozoic tectonothermal event","authors":"David W. Valentino, Jeffrey R. Chiarenzelli, Teresa E. Jordan, Robert D. Jacobi, Alexander E. Gates","doi":"10.1111/ter.12741","DOIUrl":"https://doi.org/10.1111/ter.12741","url":null,"abstract":"Besides a few isolated rift basins along the Neoproterozoic eastern Laurentian margin, the Appalachian Palaeozoic strata rest unconformably on Mesoproterozoic crystalline basement, reflecting a ca. 550+ Ma hiatus. However, a nearly 3 km deep experimental geothermal borehole through the Appalachian basin at Cornell University, New York, unexpectedly encountered deformed Neoproterozoic greenschist facies phyllites and metavolcanics (Cayuta Formation) beneath the Cambrian non‐conformity. Magnetic modelling shows they are in the 5000 km<jats:sup>2</jats:sup> fault‐bounded Ithaca basin, proposed to be associated with Iapetan rifting. The volcanism and metamorphism appear linked to ca. 600–650 Ma thermal events related or unrelated to extension, but requiring uplift and denudation of 5–10 km of rock prior to deposition of the Cambrian Potsdam Group. The Ithaca basin is >350 km inboard of the Laurentian Iapetus margin, indicating a broad Neoproterozoic rift zone for at least the NY and PA portion of eastern Laurentia.","PeriodicalId":22260,"journal":{"name":"Terra Nova","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141864852","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Shiliang Liu, Ao Wang, Weiguo Li, Yusheng Zheng, Shanlin Wang
Current research on rock damage in mining floors primarily focuses on the seepage‐stress coupling effect, overlooking the fact that rock masses in coal measure strata are predominantly layered. To address this gap, cyclic loading and unloading triaxial tests were conducted. Additionally, theoretical analysis, mathematical statistics, and other methods were used to investigate the damage evolution law of layered rock masses in coal measures. This investigation was carried out under the coupled effects of a specific stress path, characterized by ‘stress concentration‐stress unloading‐stress recovery’, and a high confined water seepage field. The results show that the compression modulus increases with the increase in confining pressure and osmotic pressure, but its increasing trend gradually slows down. Within a certain range, increasing the confining pressure and osmotic pressure helps to close rock fractures and increase stiffness.
{"title":"Damage evolution in layered rock masses of a mining floor under the influence of fluid–structure coupling","authors":"Shiliang Liu, Ao Wang, Weiguo Li, Yusheng Zheng, Shanlin Wang","doi":"10.1111/ter.12737","DOIUrl":"https://doi.org/10.1111/ter.12737","url":null,"abstract":"Current research on rock damage in mining floors primarily focuses on the seepage‐stress coupling effect, overlooking the fact that rock masses in coal measure strata are predominantly layered. To address this gap, cyclic loading and unloading triaxial tests were conducted. Additionally, theoretical analysis, mathematical statistics, and other methods were used to investigate the damage evolution law of layered rock masses in coal measures. This investigation was carried out under the coupled effects of a specific stress path, characterized by ‘stress concentration‐stress unloading‐stress recovery’, and a high confined water seepage field. The results show that the compression modulus increases with the increase in confining pressure and osmotic pressure, but its increasing trend gradually slows down. Within a certain range, increasing the confining pressure and osmotic pressure helps to close rock fractures and increase stiffness.","PeriodicalId":22260,"journal":{"name":"Terra Nova","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141778549","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Mohammad Mir, Babak Haghighi, Rohollah Taghavi Mendi, Iman Motie
Earthquakes occur when tectonic stresses develop deep within the Earth. In the earthquake zone, the rocks are igneous, including gabbro. Gabbro rocks produce electron–hole pairs under tectonic stresses. These holes flow in the volume of gabbro rock under tectonic pressures and cause changes in electric charge and as a result, produce variable electric and magnetic fields that lead to a signal of electromagnetic waves at the place of pressure. This electromagnetic signal is received on the surface of the Earth after passing through different layers of the Earth. In this work, by applying uniaxial hydraulic pressure on the gabbro rock, a new physical model similar to an earthquake is presented, which by receiving and monitoring electromagnetic signals, can help to investigate the tectonic changes in the Earth. By utilizing the electrical and optical parameters, the intensity of the electromagnetic signal of the earthquake created on the Earth's surface is calculated.
{"title":"Physical modelling of earthquake precursor by the electro‐optical parameters of gabbro rock under compressive stress","authors":"Mohammad Mir, Babak Haghighi, Rohollah Taghavi Mendi, Iman Motie","doi":"10.1111/ter.12740","DOIUrl":"https://doi.org/10.1111/ter.12740","url":null,"abstract":"Earthquakes occur when tectonic stresses develop deep within the Earth. In the earthquake zone, the rocks are igneous, including gabbro. Gabbro rocks produce electron–hole pairs under tectonic stresses. These holes flow in the volume of gabbro rock under tectonic pressures and cause changes in electric charge and as a result, produce variable electric and magnetic fields that lead to a signal of electromagnetic waves at the place of pressure. This electromagnetic signal is received on the surface of the Earth after passing through different layers of the Earth. In this work, by applying uniaxial hydraulic pressure on the gabbro rock, a new physical model similar to an earthquake is presented, which by receiving and monitoring electromagnetic signals, can help to investigate the tectonic changes in the Earth. By utilizing the electrical and optical parameters, the intensity of the electromagnetic signal of the earthquake created on the Earth's surface is calculated.","PeriodicalId":22260,"journal":{"name":"Terra Nova","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141739810","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This paper presents a finite‐differences 3D numerical model that simulates the gravity and thermal structure of the Corsica‐Sardinia Block (CSB), an apparently stable lithospheric domain characterized by cryptic tectonic activity. In the experiments, we change the density and heat production rate of the model crust within a range of geologically realistic values to fit the measured Bouguer gravity anomaly and surface heat flow pattern. The discrepancy between the observed geophysical structure and the outcomes of numerical modelling are discussed in relation to the composition of the CSB crust and finally recast in the geodynamic framework of the western Mediterranean region.
{"title":"Gravity field and geothermal structure of the Corsica‐Sardinia Block","authors":"F. Cocco, L. Casini, A. Funedda","doi":"10.1111/ter.12738","DOIUrl":"https://doi.org/10.1111/ter.12738","url":null,"abstract":"This paper presents a finite‐differences 3D numerical model that simulates the gravity and thermal structure of the Corsica‐Sardinia Block (CSB), an apparently stable lithospheric domain characterized by cryptic tectonic activity. In the experiments, we change the density and heat production rate of the model crust within a range of geologically realistic values to fit the measured Bouguer gravity anomaly and surface heat flow pattern. The discrepancy between the observed geophysical structure and the outcomes of numerical modelling are discussed in relation to the composition of the CSB crust and finally recast in the geodynamic framework of the western Mediterranean region.","PeriodicalId":22260,"journal":{"name":"Terra Nova","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141614010","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Valentin R. Troll, Frances M. Deegan, Thor Thordarson, Ari Tryggvason, Lukáš Krmíček, William M. Moreland, Björn Lund, Ilya N. Bindeman, Ármann Höskuldsson, James M. D. Day
The Reykjanes Peninsula (RP) hosts several volcanic lineaments that have been periodically active over the last 4000 years. Since 2021, following a ca. 800‐year quiescence, eight eruptions have occurred on the RP, with more expected in the future. To better understand the origins of this renewed volcanism and help forecast future eruptions, we examine (i) if the ongoing volcanism is fed from a single or multiple magma storage zone(s) or from several smaller reservoirs and; (ii) where the zone(s) are located (i.e. mantle or lower or upper crustal depths). Using major and trace element geochemistry, oxygen isotopes, and seismic tomography we rule out a single, RP‐scale, deep‐seated magma storage zone. Instead we propose the presence of a ca. 10‐km‐wide region of crustal‐level (9–12 km) magma accumulation beneath the Fagradalsfjall volcanic lineament that fed both the 2021–23 eruptions of the Fagradalsfjall Fires and the 2023–24 eruptions of the Sundhnúkur Fires.
雷克雅未克半岛（RP）上有几条火山线，在过去的 4000 年里，这些火山线周期性地活跃着。自 2021 年以来，经过约 800 年的沉寂，雷克雅未克半岛已发生了八次火山爆发，预计未来还会有更多。为了更好地了解火山活动的起源并帮助预测未来的火山爆发，我们研究了（i）正在进行的火山活动是否来自一个或多个岩浆贮存区，或者来自几个较小的贮存区；（ii）岩浆贮存区的位置（即地幔或地壳下部或上部深度）。利用主要和痕量元素地球化学、氧同位素和地震层析成像技术，我们排除了单一的 RP 规模深层岩浆储集带的可能性。相反，我们认为在法格拉达尔斯菲亚尔火山线下存在一个约10千米宽的地壳级（9-12千米）岩浆积聚区，它为2021-23年法格拉达尔斯菲亚尔火山大火的喷发和2023-24年圣努库尔火山大火的喷发提供了岩浆。
{"title":"The Fagradalsfjall and Sundhnúkur Fires of 2021–2024: A single magma reservoir under the Reykjanes Peninsula, Iceland?","authors":"Valentin R. Troll, Frances M. Deegan, Thor Thordarson, Ari Tryggvason, Lukáš Krmíček, William M. Moreland, Björn Lund, Ilya N. Bindeman, Ármann Höskuldsson, James M. D. Day","doi":"10.1111/ter.12733","DOIUrl":"https://doi.org/10.1111/ter.12733","url":null,"abstract":"The Reykjanes Peninsula (RP) hosts several volcanic lineaments that have been periodically active over the last 4000 years. Since 2021, following a ca. 800‐year quiescence, eight eruptions have occurred on the RP, with more expected in the future. To better understand the origins of this renewed volcanism and help forecast future eruptions, we examine (i) if the ongoing volcanism is fed from a single or multiple magma storage zone(s) or from several smaller reservoirs and; (ii) where the zone(s) are located (i.e. mantle or lower or upper crustal depths). Using major and trace element geochemistry, oxygen isotopes, and seismic tomography we rule out a single, RP‐scale, deep‐seated magma storage zone. Instead we propose the presence of a ca. 10‐km‐wide region of crustal‐level (9–12 km) magma accumulation beneath the Fagradalsfjall volcanic lineament that fed both the 2021–23 eruptions of the Fagradalsfjall Fires and the 2023–24 eruptions of the Sundhnúkur Fires.","PeriodicalId":22260,"journal":{"name":"Terra Nova","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141529694","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
We present a 3‐D crustal S‐wave velocity (Vs) model for eastern and northeastern Tibet utilizing ambient noise tomography. Our model reveals that crustal flow channels are absent in northeastern Tibet. In this region, the Kunlun Fault (KLF) significantly impacts mid‐lower crust low‐Vs anomalies. In addition, isolated low‐Vs anomalies beneath the Qilian orogeny are unrelated to the low‐Vs materials of the Tibetan Plateau. In the mid‐lower crust of the Songpan‐Ganzi terrane, its northeastern corner exhibits continuous low‐Vs anomalies, limited to areas south of the West Qinglin and west of 104° E. This suggests that a small‐scale northward viscous flow of crustal materials exists in the eastern KLF. However, two significant crustal flow channels (Vs ≤ 3.3 km/s) are observed in eastern Tibet. The east–west tectonic movements and the obstruction of the Sichuan Basin together facilitate the dispersion of crustal materials southward from eastern Tibet.
我们利用环境噪声层析成像技术，提出了西藏东部和东北部的三维地壳 S 波速度（Vs）模型。我们的模型显示，西藏东北部没有地壳流动通道。在这一地区，昆仑断层（KLF）对中下部地壳低 Vs 异常有很大影响。此外，祁连造山带下的孤立低 Vs 异常与青藏高原的低 Vs 物质无关。在松潘-甘孜地块的中下地壳中，其东北角出现了连续的低Vs异常，仅限于西青林以南和东经104°以西地区。然而，在西藏东部观测到两条明显的地壳流动通道（Vs ≤ 3.3 km/s）。东西向构造运动和四川盆地的阻挡共同促进了地壳物质从西藏东部向南扩散。
{"title":"Ambient noise tomography reveals complex crustal structure beneath eastern and northeastern Tibet: Insight‐ into regional crustal flow","authors":"Tengfei Wu, Chenyang Zou, Yujin Hua, Meng Chen","doi":"10.1111/ter.12736","DOIUrl":"https://doi.org/10.1111/ter.12736","url":null,"abstract":"We present a 3‐D crustal S‐wave velocity (Vs) model for eastern and northeastern Tibet utilizing ambient noise tomography. Our model reveals that crustal flow channels are absent in northeastern Tibet. In this region, the Kunlun Fault (KLF) significantly impacts mid‐lower crust low‐Vs anomalies. In addition, isolated low‐Vs anomalies beneath the Qilian orogeny are unrelated to the low‐Vs materials of the Tibetan Plateau. In the mid‐lower crust of the Songpan‐Ganzi terrane, its northeastern corner exhibits continuous low‐Vs anomalies, limited to areas south of the West Qinglin and west of 104° E. This suggests that a small‐scale northward viscous flow of crustal materials exists in the eastern KLF. However, two significant crustal flow channels (<jats:italic>V</jats:italic>s ≤ 3.3 km/s) are observed in eastern Tibet. The east–west tectonic movements and the obstruction of the Sichuan Basin together facilitate the dispersion of crustal materials southward from eastern Tibet.","PeriodicalId":22260,"journal":{"name":"Terra Nova","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141529695","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jean‐Claude Hippolyte, Paul Mann, Pierre Henry, Abel Guihou, Pierre Deschamps, Camille Ourliac, Nicolas Godeau, Lionnel Marié, Mark B. Gordon
Timing is a key data for understanding the origin of faulting. The Balcones fault system (BFS) extends ~600 km along the northern margin of the Gulf of Mexico oil basin and controls springs that supply the major cities in Texas, but its origin is unclear. We provide its first direct timing by applying U–Pb geochronology on seven calcite‐mineralized fault surfaces. We have found that this extensional fault system formed during the Palaeocene‐middle Eocene time (from 61.3 ± 2.7 to 45.4 ± 2.1 Ma), which is much earlier than previous estimates. We show that the formation of the BFS coincides with the largest clastic influx in the northern Gulf of Mexico basin that resulted from Laramide uplift and erosion. This timing and the location of the BFS along the Ouachita suture, support our interpretation of this fault system formed as the result of lithospheric flexure related to Paleogene sedimentary loading.
{"title":"U–Pb calcite dating reveals the origin of a 600 km‐long intraplate fault: The Balcones Fault System of Texas","authors":"Jean‐Claude Hippolyte, Paul Mann, Pierre Henry, Abel Guihou, Pierre Deschamps, Camille Ourliac, Nicolas Godeau, Lionnel Marié, Mark B. Gordon","doi":"10.1111/ter.12734","DOIUrl":"https://doi.org/10.1111/ter.12734","url":null,"abstract":"Timing is a key data for understanding the origin of faulting. The Balcones fault system (BFS) extends ~600 km along the northern margin of the Gulf of Mexico oil basin and controls springs that supply the major cities in Texas, but its origin is unclear. We provide its first direct timing by applying U–Pb geochronology on seven calcite‐mineralized fault surfaces. We have found that this extensional fault system formed during the Palaeocene‐middle Eocene time (from 61.3 ± 2.7 to 45.4 ± 2.1 Ma), which is much earlier than previous estimates. We show that the formation of the BFS coincides with the largest clastic influx in the northern Gulf of Mexico basin that resulted from Laramide uplift and erosion. This timing and the location of the BFS along the Ouachita suture, support our interpretation of this fault system formed as the result of lithospheric flexure related to Paleogene sedimentary loading.","PeriodicalId":22260,"journal":{"name":"Terra Nova","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141508453","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Da Wang, Wenbin Jia, Yongsheng Li, Ryan Mathur, Xiaofei Yu, Yvhan Lu, Meng Dai, Guang-Sheng Yan
Metallogenic geochronology plays a crucial role in the study of ore genesis and mineralization evolution. Unfortunately, accurately determining the metallogenic age of the non‐sulphide Zn–Pb deposits is difficult. Herein, we employed Rb–Sr dating of smithsonite and Sm–Nd dating of coexisting calcite to explore the mineralization ages of the Huoshaoyun Zn–Pb deposit. The Rb–Sr and Sm–Nd isotopic ratios yield isochron ages of 26.6 ± 1.7 and 27.5 ± 7.6 Ma, respectively. These obtained ages are identified as the metallogenic age of the Huoshaoyun deposit. Moreover, investigations into carbonate‐hosted Zn–Pb deposits in the East Tethys Metallogenic belt suggest they have formed in similar tectonic settings and yielded consistent Cenozoic ages. In sum, our research indicates that carbonate‐hosted Pb–Zn metallogenic ages in the East Tethys Metallogenic belt are principally concentrated in the late Palaeogene, and directly related to the collisional orogeny of the Tibetan Plateau during 40–26 Ma.
{"title":"Metallogenic age of the world‐class giant huoshaoyun non‐sulphide Zn–Pb deposit in Karakoram Area, Xinjiang, Northwest China","authors":"Da Wang, Wenbin Jia, Yongsheng Li, Ryan Mathur, Xiaofei Yu, Yvhan Lu, Meng Dai, Guang-Sheng Yan","doi":"10.1111/ter.12721","DOIUrl":"https://doi.org/10.1111/ter.12721","url":null,"abstract":"Metallogenic geochronology plays a crucial role in the study of ore genesis and mineralization evolution. Unfortunately, accurately determining the metallogenic age of the non‐sulphide Zn–Pb deposits is difficult. Herein, we employed Rb–Sr dating of smithsonite and Sm–Nd dating of coexisting calcite to explore the mineralization ages of the Huoshaoyun Zn–Pb deposit. The Rb–Sr and Sm–Nd isotopic ratios yield isochron ages of 26.6 ± 1.7 and 27.5 ± 7.6 Ma, respectively. These obtained ages are identified as the metallogenic age of the Huoshaoyun deposit. Moreover, investigations into carbonate‐hosted Zn–Pb deposits in the East Tethys Metallogenic belt suggest they have formed in similar tectonic settings and yielded consistent Cenozoic ages. In sum, our research indicates that carbonate‐hosted Pb–Zn metallogenic ages in the East Tethys Metallogenic belt are principally concentrated in the late Palaeogene, and directly related to the collisional orogeny of the Tibetan Plateau during 40–26 Ma.","PeriodicalId":22260,"journal":{"name":"Terra Nova","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141371535","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Kui Tong, Jinxi Li, Zhiwu Li, I. Tonguç Uysal, Jianxin Zhao, Yuexing Feng, Tian Hua, Shugen Liu
The Dabashan Fold‐and‐Thrust Belt is an important natural laboratory for exploring the Meso‐Cenozoic intracontinental orogenic evolution in China. Due to the severe lack of post‐Early Cretaceous strata, little attention has been paid to Cenozoic tectonic in the Dabashan. This study presents structural analysis, in‐situ U‐Pb dating of calcite in conjunction with petrographic and stable isotopic analyses along the eastern segment of the Chengkou Fault in the Dabashan. Structural analysis coupled with U‐Pb dating of syn‐kinematic calcite slickenfibres suggests two discrete S‐N compressional strike‐slip deformation events associated with localized E‐W extension along the eastern segment of the Chengkou Fault have occurred at the Early Eocene (~57–50 Ma) and Late Oligocene‐Early Miocene (~23–17 Ma), respectively. We tentatively related the Cenozoic deformation events in the study area to the clockwise rotation of the Sichuan Basin, resulting from the combined far‐field stress effects between the India, Eurasia and western Pacific plates.
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