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The role of pre-existing weaknesses in intraplate metamorphic core complex formation during slab retreat: 2-D thermomechanical modelling

文献类型：期刊论文

作者Tang, Jiaxuan2,3; Chen, Lin3; Liu, Lijun1; Yan, Zhiyong3; Lin, Wei2,3; Meng, Qingren2,3
刊名GEOPHYSICAL JOURNAL INTERNATIONAL
出版日期2022-09-02
卷号231期号:3页码:1688-1704
关键词Asia Numerical modelling Continental tectonics: extensional Crustal structure
ISSN号0956-540X
DOI10.1093/gji/ggac277
英文摘要A number of metamorphic core complexes (MCCs) developed in the North China Craton and adjacent regions in the Early Cretaceous and were characterized by consistent extensional orientations. These MCCs formed in the continental interior and were conceptually attributed to the retreat of the Palaeo-Pacific (Izanagi) Plate, but the exact physical mechanism remains enigmatic. Here we utilize 2-D thermomechanical simulations to study how mechanical conditions of the continental crust respond to stresses derived from oceanic subduction and their roles in the formation of MCCs. Our results demonstrate that pre-existing weaknesses are key for localized formation within the continental interior. These weaknesses first undergo compression to form thrust faults in response to shallow subduction of the oceanic slab. These thrust faults gradually transform into extensional ones as the oceanic slab starts to retreat, eventually causing the synchronous exhumation of middle-to-lower crustal rocks that form the MCCs. The P-T paths of metamorphic rocks in the core of MCCs reveal a two-stage exhumation, with isothermal decompression followed by rapid isobaric cooling. Sensitivity tests show that (1) stronger upper crust and weaker lower crust favour MCC formation, while lithospheric strength could exert an influence on the formation time of MCCs and (2) when the continental crust is hot (T-Moho = 800 degrees C), a new magmatic dome could form along the continental margin. We suggest that pre-existing weaknesses in the North China Craton played a key role in generating the quasi-simultaneous MCC series in response to the retreating Palaeo-Pacific Plate.
WOS关键词NORTH CHINA CRATON ; CONTINENTAL-CRUST ; EXTENSIONAL TECTONICS ; PLATE SUBDUCTION ; PACIFIC PLATE ; DESTRUCTION ; EVOLUTION ; YANSHAN ; EXHUMATION ; DEFORMATION
资助项目NSFC[91955311] ; NSFC[42172064] ; NSFC[91855212] ; NSF[EAR1554554] ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences[XDB18000000]
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000849364300009
出版者OXFORD UNIV PRESS
资助机构NSFC ; NSFC ; NSFC ; NSFC ; NSF ; NSF ; NSF ; NSF ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; NSFC ; NSFC ; NSFC ; NSFC ; NSF ; NSF ; NSF ; NSF ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; NSFC ; NSFC ; NSFC ; NSFC ; NSF ; NSF ; NSF ; NSF ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; NSFC ; NSFC ; NSFC ; NSFC ; NSF ; NSF ; NSF ; NSF ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences
源URL[http://ir.iggcas.ac.cn/handle/132A11/108388]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者Chen, Lin
作者单位1.Univ Illinois, Dept Geol, Urbana, IL 61801 USA
2.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Tang, Jiaxuan,Chen, Lin,Liu, Lijun,et al. The role of pre-existing weaknesses in intraplate metamorphic core complex formation during slab retreat: 2-D thermomechanical modelling[J]. GEOPHYSICAL JOURNAL INTERNATIONAL,2022,231(3):1688-1704.
APA Tang, Jiaxuan,Chen, Lin,Liu, Lijun,Yan, Zhiyong,Lin, Wei,&Meng, Qingren.(2022).The role of pre-existing weaknesses in intraplate metamorphic core complex formation during slab retreat: 2-D thermomechanical modelling.GEOPHYSICAL JOURNAL INTERNATIONAL,231(3),1688-1704.
MLA Tang, Jiaxuan,et al."The role of pre-existing weaknesses in intraplate metamorphic core complex formation during slab retreat: 2-D thermomechanical modelling".GEOPHYSICAL JOURNAL INTERNATIONAL 231.3(2022):1688-1704.

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来源：地质与地球物理研究所

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