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intra-continental orogeny:Insights from Magnetotelluric Data into the Mesozoic Uplift History of the Eastern Jiangnan Orogen in South China

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Acta Geologica Sinica(English Edition) 2023年第1期97卷 55-67页

作者： ZHANG Kun LÜ Qingtian ZHAO Jinhua YAN Jiayong LUO Fan MAN Zuhui XIAO Xiao ZHANG Gang YONG Fan Chinese Academy of Geological Sciences Beijing 100037China Key Laboratory of Deep Earth Science and Exploration Technology of Ministry of Natural Resources East China Institute of Technology Nanchang 330013China China’s University of Geosciences(Wuhan) Wuhan 430074China Central South University Changsha 410083China China’s University of Geosciences(Beijing) Beijing 100086China Institute of Geophysical and Geochemical Exploration Chinese Academy of Geological SciencesLangfangHebei 065000China

Despite extensive efforts to understand the tectonic evolution of the Jiangnan Orogen in South China,the orogenic process and its mechanism remain a matter of *** geodynamic studies have mostly focused on collisional orogeny,which is commonly invoked to explain the Jiangnan ***,it is difficult for such hypotheses to reconcile all the geological and geophysical data,especially the absence of ultrahigh-pressure metamorphic *** on the magnetotelluric data,we present a group of resistivity models produced through the combination of two-dimensional and three-dimensional inversions,revealing the geo-electrical structures of Jiangnan and a typical collisional *** our models,the resistive crust is separated into three parts by a prominent conductive layer with opposite dipping directions on both sides.A special thrust-nappe system,which is different from that developed in a typical collisional process,is revealed in the Jiangnan *** structure suggests a process different from the simple collisional *** interpret our observations,an'intra-continental orogeny'is proposed to address the development of the Jiangnan Orogen in the ***,this'reworked'process may contain at least two stages caused by the decoupling of the lithosphere,which is revealed by an extra conductive layer beneath Jiangnan.

关键词： magnetotelluric sounding 2D inversion 3D inversion intra-continental orogeny Jiangnan Orogen

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Tectonic evolution of the Dabashan orocline, central China: Insights from the superposed folds in the eastern Dabashan foreland

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Geoscience Frontiers 2013年第6期4卷 729-741页

作者： Wei Shi Jianhua Li Mi Tian Guoli Wu Key Laboratory of Neotectonic Movement and Geohazard Ministry of Land and Resources Institute of Geomechanics Chinese Academy of Geological Sciences Wuxi Research Institute of Petroleum Geology Institute of Geology and Geophysics Chinese Academy of Sciences

The Dabashan orocline is situated in the northwestern margin of the central Yangtze block,central *** studies have defined the orthogonal superposed folds growing in its central-western segment thereby confirming its two-stage tectonic evolution *** mapping has revealed that more types of superposed folds have developed in the eastern segment of the orocline,which probably provides more clues for probing the structure and tectonic history of the Dabashan *** this paper,based on geological mapping,structural measurements and analyses of deformation,we have identified three groups of folds with different trends （***-,NE-and nearly E-trending folds） and three types of structural patterns of superposed folds in the eastern Dabashan foreland （***-axial,oblique,and conjunctional superposed folds）.In combination with geochronological data,we propose that the synaxial superposed folds are due to two stages of ～N-S shortening in the west and north of the Shennongjia massif,and that oblique superposed folds have been resulted from the superposition of the NW-and NE-trending folds onto the early ～ E-W folds in the east of the Shennongjia massif in the late Jurassic to early *** conjunctional folds are composed of the NW-and NE-trending folds,corresponding to the regional-scale dual-orocline in the eastern Sichuan as a result of the southwestward expansion of the Dabashan foreland during late Jurassic to early Cretaceous,coeval with the northwestward propagation of the Xuefengshan *** of the structure and geochronology of the belt shows that the Dabashan orocline is a combined deformation belt primarily experiencing a twostage tectonic evolution history in Mesozoic,initiation of the Dabashan orocline as a foreland basin along the front of the Qinling orogen in late Triassic to early Jurassic due to collisional orogeny,and the final formation of the Dabashan orocline owing to the southwestward propagation of th

关键词： Dabashan foreland belt Superposed folds Orocline Paleo-stress field intra-continental orogeny Late Jurassic

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Ultra-hot Mesoproterozoic evolution of intracontinental central Australia

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Geoscience Frontiers 2015年第1期6卷 23-37页

作者： Weronika Gorczyk Hugh Smithies Fawna Korhonen Heather Howard Raphael Quentin De Gromard Center for Exploration Targeting School of Earth and EnvironmentThe University of Western Australia Geological Survey of Western Australia

The Musgrave Province developed at the nexus of the North, West and South Australian cratons and its Mesoproterozoic evolution incorporates a 100 Ma period of ultra-high temperature （UHT） meta- morphism from ca. 1220 to ca. 1120 Ma. This was accompanied by high-temperature A-type granitic magmatism over an 80 Ma period, sourced in part from mantle-derived components and emplaced as a series of pulsed events that also coincide with peaks in UHT metamorphism. The tectonic setting for this thermal event （the Musgrave orogeny） is thought to have been intracontinental and the lithospheric architecture of the region is suggested to have had a major influence on the thermal evolution. We use a series of two dimensional, fully coupled thermo-mechanical-petrological numerical models to investi- gate the plausibility of initiating and prolonging UHT conditions under model setup conditions appro- priate to the inferred tectonic setting and lithospheric architecture of the Musgrave Province. The results support the inferred tectonic framework for the Musgrave orogeny, predicting periods of UHT meta- morphism of up to 70 Ma, accompanied by thin crust and extensive magmatism derived from both crustal and mantle sources. The results also appear to be critically dependent upon the specific location of the Mus^rave Province. constrained between thicker cratonic masses.

关键词： Ultra-high temperature (UHT) metamorphism Numerical modeling intra-continental orogeny

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