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Basal Decollement Splaying Induces Mid-Crustal Tectonic Imbrication in an Intracontinental Orogen

文献类型：期刊论文

作者Feng, Zhentian1,4; Chu, Yang1,4; Wei, Wei1,4; Xue, Zhenhua5; Xin, Guangyao2,3; Meng, Lingtong4; Zhang, Di4; Lin, Wei1,4
刊名TECTONICS
出版日期2022-12-01
卷号41期号:12页码:24
ISSN号0278-7407
DOI10.1029/2022TC007583
英文摘要Mid-to-lower crustal rock exhumation is common in orogenic belts, but the deformation process exposing these rocks remains debated. Distributed deformation in low viscous crust extruding mid-to-lower crustal rocks as channel flow and localized deformation along shear zones imbricating rigid blocks are two end-members that account for crustal thickening and unroofing. At the northwest of the Early Paleozoic orogenic belt in the South China Block, the Jiuling Massif includes orogenic root rocks exhumed from deep crustal level. Their structural pattern and exhumation history can improve our understanding on how continental mid-to-lower crust is deformed, thickened, and finally transported to the surface. Structural analysis reveals that two major mid-crustal ductile shear zones and their splays are developed at temperatures of similar to 350 degrees C-550 degrees C. Anisotropy of magnetic susceptibility (AMS) shows that the Southern Jiuling Batholith has a modified AMS pattern by syn-orogenic compression, suggesting a gradually deformed rigid block. Combining surface geological evidence and deep structures by gravity modeling, we find shear zones rooted in basal decollement incrementally stacked the rigid granitic blocks. Along strike, the major shear zones evolved differently with more splays at their eastern portions. Thus, tectonic imbrication can evolve to pervasive flow-like deformation as shear zones continue to splay and form an anastomosed shear zone system. The complexed structures by splayed shear zones segmenting and imbricating small rigid blocks may correspond to the geophysically low-velocity zone in the crust, so shear zone splaying is a linking mechanism between tectonic imbrication and viscous flow deformation of the crust.
WOS关键词DUCTILE SHEAR ZONE ; SOUTH CHINA ; MAGNETIC-SUSCEPTIBILITY ; XUEFENGSHAN BELT ; JIANGNAN OROGEN ; STRUCTURAL DEVELOPMENT ; CRUSTAL STRUCTURE ; CATHAYSIA BLOCK ; EASTERN CHINA ; DEFORMATION
资助项目National Natural Science Foundation of China[41872208] ; National Natural Science Foundation of China[91855212] ; National Natural Science Foundation of China[91855103] ; Youth Innovation Promotion Association[2019065] ; China Scholarship Council[201804910283]
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000924525000001
出版者AMER GEOPHYSICAL UNION
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Youth Innovation Promotion Association ; Youth Innovation Promotion Association ; Youth Innovation Promotion Association ; Youth Innovation Promotion Association ; China Scholarship Council ; China Scholarship Council ; China Scholarship Council ; China Scholarship Council ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Youth Innovation Promotion Association ; Youth Innovation Promotion Association ; Youth Innovation Promotion Association ; Youth Innovation Promotion Association ; China Scholarship Council ; China Scholarship Council ; China Scholarship Council ; China Scholarship Council ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Youth Innovation Promotion Association ; Youth Innovation Promotion Association ; Youth Innovation Promotion Association ; Youth Innovation Promotion Association ; China Scholarship Council ; China Scholarship Council ; China Scholarship Council ; China Scholarship Council ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Youth Innovation Promotion Association ; Youth Innovation Promotion Association ; Youth Innovation Promotion Association ; Youth Innovation Promotion Association ; China Scholarship Council ; China Scholarship Council ; China Scholarship Council ; China Scholarship Council
源URL[http://ir.iggcas.ac.cn/handle/132A11/106785]  
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Chu, Yang
作者单位1.Univ Chinese Acad Sci, Beijing, Peoples R China
2.Chongqing Univ, State Key Lab Coal Mine Disaster Dynam & Control, Chongqing, Peoples R China
3.Chongqing Univ, Sch Resources & Safety Engn, Chongqing, Peoples R China
4.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing, Peoples R China
5.China Univ Geosci, Sch Earth Sci, Wuhan, Peoples R China
推荐引用方式
GB/T 7714		 Feng, Zhentian,Chu, Yang,Wei, Wei,et al. Basal Decollement Splaying Induces Mid-Crustal Tectonic Imbrication in an Intracontinental Orogen[J]. TECTONICS,2022,41(12):24.
APA Feng, Zhentian.,Chu, Yang.,Wei, Wei.,Xue, Zhenhua.,Xin, Guangyao.,...&Lin, Wei.(2022).Basal Decollement Splaying Induces Mid-Crustal Tectonic Imbrication in an Intracontinental Orogen.TECTONICS,41(12),24.
MLA Feng, Zhentian,et al."Basal Decollement Splaying Induces Mid-Crustal Tectonic Imbrication in an Intracontinental Orogen".TECTONICS 41.12(2022):24.

入库方式： OAI收割

来源：地质与地球物理研究所

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