Ali Khosronezhad, Mohsen Pourkermani, Mahmoud Almasiyan, Soheila Bouzari, Ali Uromeihy
Landsliding and slope instability pose significant risks to human settlements and infrastructure. This study aims to develop a landslide susceptibility map for the mountainous regions of Tehran province, Iran. The rock engineering approach was employed at a regional scale, utilizing a database of regional landslides. The semi-quantitative Rock Engineering System method was applied, considering 10 conditioning factors. The model was validated using historical landslide data, showing strong correlation. The majority of landslides occurred within medium and high susceptibility zones. Geological units, particularly the Karaj Formation's claystone layers, displayed a clear association with landslide susceptibility. The rock engineering approach yielded a highly accurate susceptibility map. Findings can inform future territorial planning in the area.
{"title":"Landslide susceptibility zoning based on Rock Engineering System application to the Tehran case study","authors":"Ali Khosronezhad, Mohsen Pourkermani, Mahmoud Almasiyan, Soheila Bouzari, Ali Uromeihy","doi":"10.1111/ter.12700","DOIUrl":"https://doi.org/10.1111/ter.12700","url":null,"abstract":"Landsliding and slope instability pose significant risks to human settlements and infrastructure. This study aims to develop a landslide susceptibility map for the mountainous regions of Tehran province, Iran. The rock engineering approach was employed at a regional scale, utilizing a database of regional landslides. The semi-quantitative Rock Engineering System method was applied, considering 10 conditioning factors. The model was validated using historical landslide data, showing strong correlation. The majority of landslides occurred within medium and high susceptibility zones. Geological units, particularly the Karaj Formation's claystone layers, displayed a clear association with landslide susceptibility. The rock engineering approach yielded a highly accurate susceptibility map. Findings can inform future territorial planning in the area.","PeriodicalId":22260,"journal":{"name":"Terra Nova","volume":"9 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2023-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138716891","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}
Kateřina Schöpfer, Kurt Decker, Fatemeh Nazari, Herfried Madritsch
The north-western Alpine foreland in Switzerland and France comprises the Late Miocene Jura Mountains, considered a type example for thin-skinned thrusting where deformation of the sedimentary cover is decoupled from the basement along a regional basal detachment. To what extent basement faults were involved during its deformation is a matter of debate. We use 3D seismic data to investigate the deformation style along the easternmost tip of the Jura range in unprecedented detail. Here, basement-rooted normal faults were not only repeatedly reactivated before thrust belt formation but also contemporaneously active as reverse/transpressional faults. They either propagated up into the Mesozoic succession without interruption (‘hard linkage’) or apparently controlled the localisation of Mesozoic faults via smaller-scale shear zones (‘soft linkage’). Our analysis of the resulting fault geometries questions the existence of a large-scale basal detachment in this area and points out the importance of thick-skinned fault reactivation.
{"title":"3D-seismic evidence for thick-skinned tectonics in a ‘classic’ thin skinned tectonics region (external Alpine foreland, Switzerland)","authors":"Kateřina Schöpfer, Kurt Decker, Fatemeh Nazari, Herfried Madritsch","doi":"10.1111/ter.12701","DOIUrl":"https://doi.org/10.1111/ter.12701","url":null,"abstract":"The north-western Alpine foreland in Switzerland and France comprises the Late Miocene Jura Mountains, considered a type example for thin-skinned thrusting where deformation of the sedimentary cover is decoupled from the basement along a regional basal detachment. To what extent basement faults were involved during its deformation is a matter of debate. We use 3D seismic data to investigate the deformation style along the easternmost tip of the Jura range in unprecedented detail. Here, basement-rooted normal faults were not only repeatedly reactivated before thrust belt formation but also contemporaneously active as reverse/transpressional faults. They either propagated up into the Mesozoic succession without interruption (‘hard linkage’) or apparently controlled the localisation of Mesozoic faults via smaller-scale shear zones (‘soft linkage’). Our analysis of the resulting fault geometries questions the existence of a large-scale basal detachment in this area and points out the importance of thick-skinned fault reactivation.","PeriodicalId":22260,"journal":{"name":"Terra Nova","volume":"38 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2023-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138716890","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}
Remnant fabrics inherited from mid-ridge play a key role in variations of plate deformation, hydration and seismicity along subduction zones. However, the quantitative relationships between the orientation of these remnant faults, plate bending and seismic activity at subduction zones still remain unclear. Here, we investigated the flexure of the Alaska subducting plate and assessed the relations between plate flexural curvatures, trench–fabric angle and seismicity. The results show that the flexural curvature and seismicity have nearly linear relationships with the trench–fabric angle. We find that remnant faults are more likely to be reactivated by plate bending at low trench–fabric angle region, causing greater plate deformation, hydration, weakening and seismicity. Plate weakening in turn promotes flexural bending curvature, resulting in higher degree of fracture and more earthquakes. However, at the high trench–fabric angle region, it is inclined to form new trench-parallel bending faults that have smaller bending curvature and less seismicity.
{"title":"The effect of pre-existing fabrics on plate bending and seismicity in Alaska subduction zone","authors":"Zonglin Guo, Jian Lin, Jiangyang Zhang, Fan Zhang, Xiaodong Yang, Zihua Cheng, Pengcheng Zhou","doi":"10.1111/ter.12699","DOIUrl":"https://doi.org/10.1111/ter.12699","url":null,"abstract":"Remnant fabrics inherited from mid-ridge play a key role in variations of plate deformation, hydration and seismicity along subduction zones. However, the quantitative relationships between the orientation of these remnant faults, plate bending and seismic activity at subduction zones still remain unclear. Here, we investigated the flexure of the Alaska subducting plate and assessed the relations between plate flexural curvatures, trench–fabric angle and seismicity. The results show that the flexural curvature and seismicity have nearly linear relationships with the trench–fabric angle. We find that remnant faults are more likely to be reactivated by plate bending at low trench–fabric angle region, causing greater plate deformation, hydration, weakening and seismicity. Plate weakening in turn promotes flexural bending curvature, resulting in higher degree of fracture and more earthquakes. However, at the high trench–fabric angle region, it is inclined to form new trench-parallel bending faults that have smaller bending curvature and less seismicity.","PeriodicalId":22260,"journal":{"name":"Terra Nova","volume":"28 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2023-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138530894","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}
Zhanying Chen, Jian Lin, Qiang Qiu, Zhiyuan Zhou, Fan Zhang
The Makran subduction zone has historically experienced major earthquakes and tsunamis. Here, we integrate fault morphology, InSAR measurements, and high-resolution bathymetry to quantitively evaluate potential future tsunami sources and tsunami wave characteristics. We systematically investigate how earthquake rupture speed and direction could affect tsunami hazards for the Makran region. Our analyses reveal the following new understanding: (1) The estimated maximum slip deficit in the Makran region southeast of the Gwadar port is >4 m since the last significant 1851 rupture; (2) Earthquakes with finite rupture speed investigated in the range of 300–1,000 m/s are calculated to generate higher tsunami waves than the static rupture model; (3) For an east-to-west rupture direction, the tsunami waves are calculated to arrive at the Gwadar port 3–5 mins later but with higher waves than the static rupture model. Together, our results highlight the importance of the source earthquake rupture speed and directivity in controlling tsunamigenic effects.
{"title":"Tsunami potential in the Makran subduction zone: Amplification effects from earthquake rupture directivity and speed","authors":"Zhanying Chen, Jian Lin, Qiang Qiu, Zhiyuan Zhou, Fan Zhang","doi":"10.1111/ter.12698","DOIUrl":"https://doi.org/10.1111/ter.12698","url":null,"abstract":"The Makran subduction zone has historically experienced major earthquakes and tsunamis. Here, we integrate fault morphology, InSAR measurements, and high-resolution bathymetry to quantitively evaluate potential future tsunami sources and tsunami wave characteristics. We systematically investigate how earthquake rupture speed and direction could affect tsunami hazards for the Makran region. Our analyses reveal the following new understanding: (1) The estimated maximum slip deficit in the Makran region southeast of the Gwadar port is >4 m since the last significant 1851 rupture; (2) Earthquakes with finite rupture speed investigated in the range of 300–1,000 m/s are calculated to generate higher tsunami waves than the static rupture model; (3) For an east-to-west rupture direction, the tsunami waves are calculated to arrive at the Gwadar port 3–5 mins later but with higher waves than the static rupture model. Together, our results highlight the importance of the source earthquake rupture speed and directivity in controlling tsunamigenic effects.","PeriodicalId":22260,"journal":{"name":"Terra Nova","volume":"74 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2023-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138530890","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}
Mark E. Holland, Michael Mohr, Mark Schmitz, Lauren Madronich, Karl Karlstrom
Competing hypotheses attribute the regional loss of 1.2–1.0 Ga detrital zircon from the Cambrian Sauk Sequence in southwestern North America to differing tectonic controls on surface topography. We test three hypotheses with source-to-sink detrital zircon provenance analysis via tandem in situ and isotope dilution U–Pb geochronology paired with geochemical and Hf-isotope tracers. Our data indicate that the lower-to-middle Sixtymile Formation in Grand Canyon was derived from ca. 1.1 Ga rocks of the Llano Uplift and the ca. 539–523 Ma Wichita igneous province, approximately 1400 km away. In contrast, new U–Pb geochronology links the upper Sixtymile and Tapeats formations to the 513–510 Ma Florida Mountains intrusive complex, southern New Mexico, and proximal 1.4 and 1.7 Ga basement approximately 650 km away. We attribute a regional provenance shift to plume–lithosphere interactions on the Iapetan margin, tectonism along ‘leaky’ intracratonic transverse fault zones and the rift-to-drift transition on the Cordilleran margin.
北美西南部寒武系索克层序中1.2 ~ 1.0 Ga碎屑锆石的区域性损失，主要归因于不同构造对地表地形的控制。通过原位和同位素稀释U-Pb年代学，结合地球化学和hf同位素示踪剂，对碎屑锆石源-汇物源进行分析，验证了三个假设。我们的数据表明，大峡谷中下60英里组来自约1.1 Ga的Llano隆起和约539-523 Ma Wichita火成岩省，大约1400 km。相比之下，新的U-Pb年代学将上60英里组和Tapeats组与新墨西哥州南部的513-510 Ma佛罗里达山脉侵入杂岩以及大约650公里外的近1.4和1.7 Ga基底联系起来。我们将区域物源转移归因于Iapetan边缘的羽流-岩石圈相互作用、沿“泄漏”克拉通内横向断裂带的构造作用以及科迪勒拉边缘的裂谷-漂移转变。
{"title":"Source-to-sink tandem geochronology reveals tectonic influences on the Cambrian Transcontinental Arch of Laurentia","authors":"Mark E. Holland, Michael Mohr, Mark Schmitz, Lauren Madronich, Karl Karlstrom","doi":"10.1111/ter.12692","DOIUrl":"https://doi.org/10.1111/ter.12692","url":null,"abstract":"Competing hypotheses attribute the regional loss of 1.2–1.0 Ga detrital zircon from the Cambrian Sauk Sequence in southwestern North America to differing tectonic controls on surface topography. We test three hypotheses with source-to-sink detrital zircon provenance analysis via tandem in situ and isotope dilution U–Pb geochronology paired with geochemical and Hf-isotope tracers. Our data indicate that the lower-to-middle Sixtymile Formation in Grand Canyon was derived from ca. 1.1 Ga rocks of the Llano Uplift and the ca. 539–523 Ma Wichita igneous province, approximately 1400 km away. In contrast, new U–Pb geochronology links the upper Sixtymile and Tapeats formations to the 513–510 Ma Florida Mountains intrusive complex, southern New Mexico, and proximal 1.4 and 1.7 Ga basement approximately 650 km away. We attribute a regional provenance shift to plume–lithosphere interactions on the Iapetan margin, tectonism along ‘leaky’ intracratonic transverse fault zones and the rift-to-drift transition on the Cordilleran margin.","PeriodicalId":22260,"journal":{"name":"Terra Nova","volume":"12 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2023-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138530935","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}
Zhaofei Liu, Zhi Chen, Ying Li, Peng Du, Yuanxin Zhao, Lei Lei, Chang Lu, Ruilin Huangfu
Soil gas radon (Rn) serves as an effective indicator for assessing fault activity in fault zones. Measurement of Rn degassing at the active faults was conducted twice in 2017 and 2018 to assess fault activity in the western margin of the Ordos block. The concentration and flux values of Rn ranged from 0.41 to 40.93 kBq m−3 and 5.17 to 140.33 mBq m−2 s−1, respectively. The compression of the Tibetan Plateau has led to higher Rn concentration and flux in the southern part compared with the northern part. The fault activity is evaluated by the index of IRn calculated from Rn concentrations. The Haiyuan arcuate tectonic region exhibited the most intensive fault activity, followed by the Yinchuan Basin and Jilantai-Linhe Basin. These findings enhance our understanding of the relationship between fault activity and Rn emission and provide a significant geochemical reference for the fault activity.
{"title":"Degassing of soil gas radon and its implication to fault activity in the western margin of the Ordos Block, China","authors":"Zhaofei Liu, Zhi Chen, Ying Li, Peng Du, Yuanxin Zhao, Lei Lei, Chang Lu, Ruilin Huangfu","doi":"10.1111/ter.12695","DOIUrl":"https://doi.org/10.1111/ter.12695","url":null,"abstract":"Soil gas radon (Rn) serves as an effective indicator for assessing fault activity in fault zones. Measurement of Rn degassing at the active faults was conducted twice in 2017 and 2018 to assess fault activity in the western margin of the Ordos block. The concentration and flux values of Rn ranged from 0.41 to 40.93 kBq m<sup>−3</sup> and 5.17 to 140.33 mBq m<sup>−2</sup> s<sup>−1</sup>, respectively. The compression of the Tibetan Plateau has led to higher Rn concentration and flux in the southern part compared with the northern part. The fault activity is evaluated by the index of <i>I</i><sub>Rn</sub> calculated from Rn concentrations. The Haiyuan arcuate tectonic region exhibited the most intensive fault activity, followed by the Yinchuan Basin and Jilantai-Linhe Basin. These findings enhance our understanding of the relationship between fault activity and Rn emission and provide a significant geochemical reference for the fault activity.","PeriodicalId":22260,"journal":{"name":"Terra Nova","volume":"42 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2023-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138530888","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}
Terra NovaVolume 35, Issue 6 p. 570-572 LIST OF REVIEWERS List of Reviewers First published: 10 November 2023 https://doi.org/10.1111/ter.12696Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onEmailFacebookTwitterLinkedInRedditWechat No abstract is available for this article. Volume35, Issue6December 2023Pages 570-572 RelatedInformation
Terra novvol . 35, Issue 6 p. 570-572审稿人列表审稿人列表首次发布:2023年11月10日https://doi.org/10.1111/ter.12696Read全文taboutpdf ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare给予accessShare全文accessShare全文accessShare全文accessShare请查看我们的使用条款和条件，并在下面的复选框中选择分享文章的全文版本。我已经阅读并接受了Wiley在线图书馆使用共享链接的条款和条件，请使用下面的链接与您的朋友和同事分享本文的全文版本。学习更多的知识。复制URL共享链接共享一个emailfacebooktwitterlinkedinreddit微信本文无摘要vol . 35, Issue6December 2023页570-572
{"title":"List of Reviewers","authors":"","doi":"10.1111/ter.12696","DOIUrl":"https://doi.org/10.1111/ter.12696","url":null,"abstract":"Terra NovaVolume 35, Issue 6 p. 570-572 LIST OF REVIEWERS List of Reviewers First published: 10 November 2023 https://doi.org/10.1111/ter.12696Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onEmailFacebookTwitterLinkedInRedditWechat No abstract is available for this article. Volume35, Issue6December 2023Pages 570-572 RelatedInformation","PeriodicalId":22260,"journal":{"name":"Terra Nova","volume":" 1017","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135186070","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}
Abstract A catalogue of precisely located micro‐seismicity is fundamental for investigating seismicity and rock physical properties in active tectonic and volcanic regions and for the definition of a ‘baseline’ seismicity, required for a safe future exploitation of georesource areas. In this study, we produce the first manually revised catalogue of micro‐seismicity for Co. Donegal region (Ireland), an area of about 50 K M 2 of on‐going deformation, aimed at localizing natural micro‐seismic events occurred between 2012 and 2015. We develop a stochastic method based on a Markov chain Monte Carlo (McMC) sampling approach to compute earthquake hypocentral location parameters. Our results indicates that micro‐seismicity is present with magnitudes lower than 2 (the highest magnitude is 2.8).The recorded seismicity is almost clustered along previously mapped NE‐SW trending, steeply dipping faults and confined within the upper crust (focal depth less than 10 km). We also recorded anthropogenic seismicity mostly related to quarries' activity in the study area.
{"title":"The micro‐seismicity of Co. Donegal (Ireland): Defining baseline seismicity in a region of slow lithospheric deformation","authors":"Federica Riva, Nicola Piana Agostinetti, Simone Marzorati, Clare Horan","doi":"10.1111/ter.12691","DOIUrl":"https://doi.org/10.1111/ter.12691","url":null,"abstract":"Abstract A catalogue of precisely located micro‐seismicity is fundamental for investigating seismicity and rock physical properties in active tectonic and volcanic regions and for the definition of a ‘baseline’ seismicity, required for a safe future exploitation of georesource areas. In this study, we produce the first manually revised catalogue of micro‐seismicity for Co. Donegal region (Ireland), an area of about 50 K M 2 of on‐going deformation, aimed at localizing natural micro‐seismic events occurred between 2012 and 2015. We develop a stochastic method based on a Markov chain Monte Carlo (McMC) sampling approach to compute earthquake hypocentral location parameters. Our results indicates that micro‐seismicity is present with magnitudes lower than 2 (the highest magnitude is 2.8).The recorded seismicity is almost clustered along previously mapped NE‐SW trending, steeply dipping faults and confined within the upper crust (focal depth less than 10 km). We also recorded anthropogenic seismicity mostly related to quarries' activity in the study area.","PeriodicalId":22260,"journal":{"name":"Terra Nova","volume":"42 22","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135681281","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}
Francesca Meneghini, Maria Di Rosa, Michele Marroni, Hugues Raimbourg, Luca Pandolfi
Abstract The Internal Ligurian units (Northern Apennine) represent deformed and metamorphosed fragments of the oceanic lithosphere of the Ligure–Piemontese oceanic basin. Different tectonic models have been proposed for the geodynamic setting in which the deformation and metamorphism have been acquired. However, the lack of updated, clear, thermo‐barometric data has made it hard to unambiguously discriminate between these different proposed models. In this article, we provide evidence for the deformation of the Palombini Shale, i.e., pelagic deposits belonging to the Internal Ligurian units, under P and T peak conditions of 230–300°C. and 0.6–0.9 GPa, respectively. These data indicate that the Internal Ligurian units were affected by a blueschist facies metamorphism achieved during the underplating within the accretionary wedge developed during the Late Cretaceous—Early Tertiary Alpine subduction. These data support the hypothesis of a unique, pre‐Oligocene orogenic system for the Alpine belt and the westernmost sector of the Northern Apennines belt.
{"title":"Subduction signature in the Internal Ligurian units (Northern Apennine, Italy): Evidence from <i>P</i>–<i>T</i> metamorphic peak estimate","authors":"Francesca Meneghini, Maria Di Rosa, Michele Marroni, Hugues Raimbourg, Luca Pandolfi","doi":"10.1111/ter.12694","DOIUrl":"https://doi.org/10.1111/ter.12694","url":null,"abstract":"Abstract The Internal Ligurian units (Northern Apennine) represent deformed and metamorphosed fragments of the oceanic lithosphere of the Ligure–Piemontese oceanic basin. Different tectonic models have been proposed for the geodynamic setting in which the deformation and metamorphism have been acquired. However, the lack of updated, clear, thermo‐barometric data has made it hard to unambiguously discriminate between these different proposed models. In this article, we provide evidence for the deformation of the Palombini Shale, i.e., pelagic deposits belonging to the Internal Ligurian units, under P and T peak conditions of 230–300°C. and 0.6–0.9 GPa, respectively. These data indicate that the Internal Ligurian units were affected by a blueschist facies metamorphism achieved during the underplating within the accretionary wedge developed during the Late Cretaceous—Early Tertiary Alpine subduction. These data support the hypothesis of a unique, pre‐Oligocene orogenic system for the Alpine belt and the westernmost sector of the Northern Apennines belt.","PeriodicalId":22260,"journal":{"name":"Terra Nova","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136022713","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}
Stephen Collett, Igor Soejono, Vít Peřestý, Karel Schulmann, Pavla Štípská, Jitka Míková, Nikol Novotná
Abstract The Mongolian micro‐continental fragments play an important geodynamic role in the Palaeozoic evolution of the Central Asian Orogenic Belt. However, the original provenance of individual blocks within the Nuna/Columbia and Rodinia supercontinents is not well constrained. In this work, we present zircon U–Pb and Lu–Hf isotopic data from the Mesoproterozoic to Neoproterozoic metamorphosed cover of the Baidrag Block in central Mongolia. These data reveal important maxima in the Neoarchean, Palaeoproterozoic and locally Neoproterozoic. Although the majority of the new data can be attributed to local sources within the basement of the Mongolian micro‐continental fragments, an important contribution of juvenile 2.0 Ga zircons is linked to the western margin of the Siberian Craton, and 1.5 Ga zircons are either directly derived from North Australia or indirectly recycled from sediments in NW Laurentia.
{"title":"Mongolian micro‐continental blocks in Columbia/Nuna: Zircon U–Pb–Hf isotopic evidence for long‐lasting Mongolia–Western Siberia connection","authors":"Stephen Collett, Igor Soejono, Vít Peřestý, Karel Schulmann, Pavla Štípská, Jitka Míková, Nikol Novotná","doi":"10.1111/ter.12693","DOIUrl":"https://doi.org/10.1111/ter.12693","url":null,"abstract":"Abstract The Mongolian micro‐continental fragments play an important geodynamic role in the Palaeozoic evolution of the Central Asian Orogenic Belt. However, the original provenance of individual blocks within the Nuna/Columbia and Rodinia supercontinents is not well constrained. In this work, we present zircon U–Pb and Lu–Hf isotopic data from the Mesoproterozoic to Neoproterozoic metamorphosed cover of the Baidrag Block in central Mongolia. These data reveal important maxima in the Neoarchean, Palaeoproterozoic and locally Neoproterozoic. Although the majority of the new data can be attributed to local sources within the basement of the Mongolian micro‐continental fragments, an important contribution of juvenile 2.0 Ga zircons is linked to the western margin of the Siberian Craton, and 1.5 Ga zircons are either directly derived from North Australia or indirectly recycled from sediments in NW Laurentia.","PeriodicalId":22260,"journal":{"name":"Terra Nova","volume":"42 5","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135315605","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：