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extensional tectonics and North China Craton destruction:Insights from the magnetic susceptibility anisotropy(AMS)of granite and metamorphic core complex

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Science China Earth Sciences 2021年第9期64卷 1557-1589页

作者： Wei LIN Jipei ZENG Lingtong MENG Huabiao QIU Wei WEI Zhiheng REN Yang CHU Shuangjian LI Chao SONG Qincheng WANG State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsInnovation Academy for Earth ScienceChinese Academy of SciencesBeijing100029China College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijing100049China Sinopec Petroleum Exploration and Production Research Institute Beijing100083China SinoProbe Center Chinese Academy of Geological SciencesBeijing100037China

The craton is a long-lived stable geologic unit on the Earth’s ***,since the Mesozoic,the North China Craton(NCC)experienced large-scale lithospheric removal,the fundamental change of physical and chemical characteristics of the lithospheric mantle,widely distributed crustal deformation,and extensive *** complex evolution contrary to other cratons is called the NCC *** magmatism in the eastern NCC is an important response to the lithospheric removal at depth and crustal deformation on the *** plutons emplace under a tectonic context and therefore record the information of the tectonics;especially,the anisotropy magnetic susceptibility(AMS)pattern of the pluton was acquired with the influence of regional *** the past fifteen years,about 22 plutons intruding during the different periods from the Late Triassic to the late stage of the Early Cretaceous have been studied with *** emplacement mechanisms of plutons and the contemporary tectonic setting were discussed to constrain their relationship with the NCC destruction in different stages of *** a result,the Late Triassic,Early Jurassic,and Late Jurassic plutons exhibit consistent N(E)-S(W)trending magnetic *** early stage of Early Cretaceous plutons display NW-SE trending magnetic lineations,while the late stage of Early Cretaceous plutons show magnetic lineations with various *** with previous studies,it is concluded that the emplacements of the plutons intruding in these three stages were controlled by weak N(E)-S(W)trending extension,regional NW-SE trending extension,and weak extension in the shallow crustal level,*** transformation of regional extension from the N(E)-S(W)to the NW-SE direction was accompanied by a strain-increasing *** extensional tectonics in the eastern NCC was interpreted to represent the interaction between Mongol-Okhotsk belt,PaleoPacific plate,and eastern Eurasian continent

关键词： Mesozoic granite Anisotropy of magnetic susceptibility(AMS)of granite Eastern NCC extensional tectonics NCC destruction

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extensional tectonics, Rifting, Formation of Sedimentary Basins, Cretaceous Volcanism, Emplacement of Dyke Swarms and Development of Hydrocarbon Pools: Case Studies from Peninsular India and Indian Ocean Region

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Acta Geologica Sinica(English Edition) 2016年第S1期90卷 61-62页

作者： K.S.MISRA University of Petroleum and Energy Studies Kumaun University

Prolonged extensional regime in peninsular India resulted in formation of rift and grabens,elongated basins and Gondwana sedimentation along *** progression of rift related faults caused decompression

关键词： extensional tectonics Formation of Sedimentary Basins Rifting Cretaceous Volcanism Emplacement of Dyke Swarms and Development of Hydrocarbon Pools

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Late Mesozoic Tectono-Thermal History in the South Margin of Great Xing’an Range,NE China:Insights from Zircon and Apatite(U-Th)/He Ages

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Journal of Earth Science 2022年第1期33卷 36-44页

作者： Wen Zhang Shuangfeng Zhao Jingbo Sun Ze Shen Wen Chen Laboratory of Isotope Thermochronology Key Laboratory of Deep-Earth Dynamics of Ministry of Natural ResourcesInstitute of GeologyChinese Academy of Geological SciencesBeijing 100037China

The Late Mesozoic tectono-thermal evolution and geodynamic setting of the Great Xing’an Range(GXR),particularly in the south margin,are still *** this study,we present original low-temperature thermochronological data of six granitoid samples collected from Maanzi pluton in the south margin of the *** apatite and zircon(U-Th)/He ages vary of 70.8 ± 4.3-119.0 ±7.0 Ma and 120.0 ± 7.1-146.7 ± 8.7 Ma,*** numerical inverse modeling results reveal that the granitoid plutons experienced a rapid cooling and exhumation stage during Early Cretaceous with a rate of ~5.0-6.0 ℃/Ma and ~0.14-0.17 mm/yr,respectively,including the western minor pluton emplaced during Early Permian and the major pluton crystallized in latest Jurassic,corresponding to the extensional tectonics in NE *** rapid exhumation processes in the south margin of the GXR during the Early Cretaceous could be related to both the rollback of Paleo-Pacific oceanic plate and the collapse of thickened crust in the Mongol-Okhotsk Orogen.

关键词： Great Xing’an Range tectono-thermal history (U-Th)/He dating extensional tectonics Mongol-Okhotsk collapse Paleo-Pacific subduction geochemistry

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Deadly oasis:Recurrent annihilation of Cretaceous desert bryophyte colonies;the role of solar,climate and lithospheric forcing

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Geoscience Frontiers 2021年第1期12卷 1-12页

作者： Juan Pedro Rodríguez-Lópeza Eduardo Barrón Daniel Peyrot Gary B.Hughes Department of Geology.Faculty of Science.United Arab Emirates University.50009.Al Ain Abu DhabiUnited Arab Emirates Instituto Geológico y Minero de Espana(IGME) Ríos Rosas 23E-28003MadridSpain School of Earth and Environment University of Western Australia.6101CrawleyWestern AustraliaAustralia Centre for Energy Geosciences University of Western Australia.6101CrawleyWestern AustraliaAustralia Physics Department University of CaliforniaSanta BarbaraCA93106USA

Many oases(wet interdunes)are sedimentary systems characterized by high-frequency water-level oscillations,marked changes in salinity and intense biological activity at their *** are considered to be one of the most challenging environments on Earth for ecosystem *** dynamic,depositional settings are usually unfavourable for fossilization and subsequent preservation of vegetal *** paper describes bryophyte(liverwort)assemblages occurring in three successive horizons interpreted to represent(i)recurrent early successional phases of biological soil crust colonization of wet interdune margins or(ii)exceptional preservation of floating or riparian liverworts in oasis pond waters associated with a progressive fall of the interdune water *** record of in situ colonization surfaces characterized by delicate(***-free)three-dimensional structures represents an exceptional type of preservation herein associated with a rapid variation in phreatic interdune water level and the subsequent establishment of anoxic and reducing *** occurrence of exceptionally preserved liverwort colonies coincides with the sedimentary record of,at least,three seismite levels in the *** gathered from the site suggests that the water table of the oasis was controlled by a combination of(i)a positive creation of accommodation space due to subsidence associated with movement on syn-sedimentary extensional faults,and(ii)the rise and fall of the oasis water table controlled by the oscillations of the groundwater system due to orbital changes which appear to drive the variability of the climate *** groundwater levels flooded the oasis soil crusts and lead to the exceptional recurrent preservation of liverwort colonies at the oasis ***,considering the hypothesis of floating or riparian liverworts in the oasis pond waters,the fall in the level of the oasis water table placed the floating liverworts in contact with the

关键词： Oasis Cretaceous Liverworts Colonies extensional tectonics Solar cyclicity

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The Earlier Spreading of South China Sea Basin due to the Late Mesozoic to Early Cenozoic Extension of South China Block: Structural Styles and Chronological Evidence from the Dulong-Song Chay Metamorphic Dome, Southwest China

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Journal of China University of Geosciences 2005年第3期16卷 189-199页

作者： Yan Danping Zhou Meifu Wang Yan Zhao Taiping State Key Laboratory of Geological Processes and Mineral Resources School of Earth Sciences and Resources China University of Geosciences Beijing 100083 China Laboratory of Marginal Sea Geology Guangzhou Institute of Geochemistry ＆ South China Sea Institute of Oceanology Chinese Academy of Sciences Guangzhou 510640 China Department of Earth Sciences The University of Hong Kong Hong Kong SAR China

To understand the forming and tectonic evolution of the South China Sea basin, new data of the structural styles and geochronology were obtained from the Dulong-Song Chay dome, southeastern Yunnan and northern Vietnam. The structural styles were acquired through field investigation and geo-chronological dating was carried out using zircon SHRIMP Ⅱ U-P and argon isotopic analyses. The South China Sea basin extension occurred firstly at Late Mesozoic to Early Cenozoic, and then at Late Oligocene to Middle Miocene （32-17 Ma）. The second stage of extension formed immediately after the first stage, and both extensions have a consistent forming mechanism. New structural analysis and geo-chronological data do not support the models of ＂backarc spreading＂ and ＂strike-slip faults producing the extension＂. Then what mechanism resulted in the extension of South China Sea basin？ The data indicate that at least two episodes of major extensional tectonics, i.e. , the D1 deformation at 237-228 Ma resulted in the rising and exhumation of the dome, and D2 deformation at 86-78 Ma overprinted and redeformed the dome. Of them, the D2 shows a consistent forming time, extensional direction and tectonic regime among Dulong-Song Chay dome, South China block and the northern margin of the South China Sea basin. Regional geology has proved that the northern margin of the South China Sea basin belongs to the South China block, therefore, we interpreted that the Late Mesozoic to Early Cenozoic extensional tectonics occurred in the northern margin of the South China Sea basin due to the intraplate deformation of the South China block, while the Ailaoshan-Red River sinistral slip strengthened the Cenozoic extension in the South China Sea basin.

关键词： South China Sea basin Dulong-Song Chay metamorphic dome South China block extensional tectonics geochronological determination

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Metamorphic Core Complexes and Its Significance in the Continental Crustal Evolution

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Journal of Earth Science 1990年第1期9卷 115-125,136页

作者： Song Honglin Wei BizeDepartment of Geology , China University of Geosciences , Wuhan 430074

Metamorphic core complexes are a basic structural pattern related to extensional tectonics. Several characteristics of different scales of metamorphic core complexes in the Fangshan and Yunmengshan (Beijing) , Zhongtiaoshan (Shanxi) , and Dengfong (Henan) are examined. A three-layer model for metam orphic core complexes is suggested . The conclusion is that metam orphic core complexes are the result of multiphase intracontinental crustal extensions and are an important tectonic pattern. which exposes the basement metam orphic rocks to the ground surface in the intracontinental cover .

关键词： metamorphic core complex denudational fault system extensional tectonics

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