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lithosphere architecture characterized by crust±mantle decoupling controls the formation of orogenic gold deposits

National Science Review 2023年第3期10卷 77-91页

作者： Zengqian Hou Qingfei Wang Haijiang Zhang Bo Xu Nian Yu Rui Wang David I.Groves Yuanchuan Zheng Shoucheng Han Lei Gao Lin Yang Institute of Geology Chinese Academy of Geological Sciences State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences(Beijing) School of Earth and Space Sciences University of Science and Technology of China School of Electrical Engineering Chongqing University Centre for Exploration Targeting University of Western Australia

This study,via combined analysis of geophysical and geochemical data,reveals a lithospheric architecture characterized by crust-mantle decoupling and vertical heat-flow conduits that control orogenic gold mineralization in the Ailaoshan gold belt on the southeastern margin of *** mantle seismic tomography indicates that the crust-mantle decoupled deformation,defined from previous seismic anisotropy analysis,was formed by upwelling and lateral flow of the asthenosphere,driven by deep sub duction of the Indian continent,Our magnetotelluric and seismic images show both a vertical conductor across the Moho and high Vp/Vs anomalies both in the uppermost mantle and lowest crust,suggesting that crust-mantle decoupling promotes ponding of mantle-derived basic melts at the base of the crust via a heat-flow *** gas isotope and halogen ratios of gold-related ore minerals indicate a mantle source of ore fluid.A rapid decrease in Cl/F ratios of lamprophyres under conditions of 1.2 GPa and1050 ℃ suggests that the ore fluid was derived from degassing of the basic *** lithospheric architecture is recognized in other orogenic gold provinces,implying analogous formational controls.

关键词： crust–mantle decoupling lithosphere architecture orogenic gold deposit seismic tomography magnetotelluric imaging Tibet

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Wedge tectonics in South China:constraints from new seismic data

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Science Bulletin 2022年第14期67卷 1496-1507,M0004页

作者： Tingzi Li Mingming Jiang Liang Zhao Weihua Yao Ling Chen Yang Chu Baolu Sun Yinshuang Ai Bo Wan Klaus Gessner Huaiyu Yuan State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China Australian Research Council Centre of Excellence for Core to Crust Fluid Systems Department of Earth and Environmental SciencesMacquarie UniversityNew South Wales 2109Australia Centre for Exploration Targeting University of Western AustraliaCrawley WA 6009Australia Key Laboratory of Earth and Plantenry Physics Chinese Academy of SciencesBeijing 100029China University of Chinese Academy of Sciences Beijing 100049China Guangdong Provincial Key Lab of Geodynamics and Geohazards School of Earth Sciences and EngineeringSun Yat-sen UniversityGuangzhou 510275China Geological Survey of Western Australia Perth WA 6001Australia

Collisional orogens form when tectonic forces amalgamte fragments of Earth’s continental *** sutures between individual fragments,or terranes,are potential sites of weakness that facilitate subsequent continental ***,the lithospheric architecture of collisional orogens provides key information for evaluating the long-term evolution of the continental interior:for example,the South China Block(SCB),where the tectonic history is severely obscured by extensive surface deformation,magmatism,and *** new passive-source seismic models,we show a contrasting seismic architecture across the SCB,with three prominent crustal dipping structures across the Jiangnan *** with constraints from multi-disciplinary regional geophysical datasets,these pronounced dipping patterns are interpreted as relict wedge-like lithospheric deformation zones initiated in the fossil collisions that assembled the Yangtze Block and the *** overall trend of these tectonic wedges implies successive crustal growth along paleo-continental margins and is indicative of northward subduction and docking of accretional *** contrast,no such dipping structures are preserved in the Cathaysia Block,indicating a weak and reorganized *** variations in the deformation responses across the SCB reflect the long-term modifications of the lithosphere caused by prolonged collision and extension events throughout the tectonic history of the *** results demonstrate the critical roles that suture zones played in the successive growth and evolution of the continental lithosphere.

关键词： lithosphere architecture Seismic receiver functions Ambient noise tomography South China Block Wedge tectonics

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