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Lower Crustal Rheology Controls the Development of Large Offset Strike-Slip Faults During the Himalayan-Tibetan Orogeny

文献类型：期刊论文

作者Yang, Jianfeng1,3,4; Kaus, Boris J. P.4; Li, Yang3; Leloup, Philippe Herve2; Popov, Anton A.4; Lu, Gang3; Wang, Kun3; Zhao, Liang3
刊名GEOPHYSICAL RESEARCH LETTERS
出版日期2020-09-28
卷号47期号:18页码:11
ISSN号0094-8276
关键词strike-slip fault shear localization India-Eurasia collision continental extrusion
DOI10.1029/2020GL089435
英文摘要The mechanism of crustal deformation and the development of large offset strike-slip faults during continental collision, such as the India-Eurasia zone, remains poorly understood. Previous mechanical models were simplified which are either (quasi-)2-D approximations or made the a priori assumption that the rheology of the lithosphere was either purely viscous (distributed deformation) or purely localized. Here we present three-dimensional visco-elasto-plastic thermo-mechanical simulations, which can produce both distributed and highly localized deformation, to investigate crustal deformation during continental indentation. Our results show that large-scale shear zones develop as a result of frictional plasticity, which have many similarities with observed shear zones. Yet localized deformation requires both a strong upper crust (>10(22) Pa center dot s) and a moderately weak middle/lower crust (similar to 10(20) Pa center dot s) in Tibet. The brittle shear zones in our models develop low viscosity zones directly beneath them, consistent with geological observations of exhumed faults, and geophysical observations across active faults. Plain Language Summary Large offset strike-slip faults are one of the key surface features of continental collision, such as in Tibet. These narrow belts of strike-slip faults accommodate strong deformation, and deciphering their mechanism of formation helps to understand the complex dynamics of India-Eurasia collision. Yet previous models developed to address this either assumed simplified rheologies or employed low numerical resolutions that is insufficient to simulate the spontaneous formation of localized zones. Here, we present high-resolution 3-D visco-elasto-plastic thermo-mechanical models that simulate the formation of large-scale strike-slip faults during Indian indentation, while also taking distributed deformation into account. Our simulations show that a combination of a strong upper crust and a moderately weak middle/lower crust produces faults that are, to first order, consistent with observed ones in the Tibet region. Localized deformation usually initiates at the brittle-ductile transition, and a weak middle/lower crust facilitates subsequent shear localization such that the shear zones cut through the whole crust. The craton-like strong terranes can sustain large stresses and initiate large offset faults along their boundaries.
WOS关键词LOW-VELOCITY ZONE ; NUMERICAL SIMULATIONS ; EXTRUSION TECTONICS ; SURFACE DEFORMATION ; EASTWARD EXPANSION ; KUNLUN FAULT ; SHEAR ZONES ; PLATEAU ; INSIGHTS ; EASTERN
资助项目China Scholarship Council ; CAS Pioneer Hundred Talents Program (Chinese Academy of Sciences) ; NSFC[41888101] ; NSFC[91755000] ; NSFC[41625016] ; NSFC[41774112] ; National Key R&D Program of China[2017YFC0601206] ; Strategic Priority Research Program (B) of CAS[XDB18000000]
WOS研究方向Geology
语种英语
出版者AMER GEOPHYSICAL UNION
WOS记录号WOS:000576634400008
资助机构China Scholarship Council ; China Scholarship Council ; China Scholarship Council ; China Scholarship Council ; CAS Pioneer Hundred Talents Program (Chinese Academy of Sciences) ; CAS Pioneer Hundred Talents Program (Chinese Academy of Sciences) ; CAS Pioneer Hundred Talents Program (Chinese Academy of Sciences) ; CAS Pioneer Hundred Talents Program (Chinese Academy of Sciences) ; NSFC ; NSFC ; NSFC ; NSFC ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; Strategic Priority Research Program (B) of CAS ; Strategic Priority Research Program (B) of CAS ; Strategic Priority Research Program (B) of CAS ; Strategic Priority Research Program (B) of CAS ; China Scholarship Council ; China Scholarship Council ; China Scholarship Council ; China Scholarship Council ; CAS Pioneer Hundred Talents Program (Chinese Academy of Sciences) ; CAS Pioneer Hundred Talents Program (Chinese Academy of Sciences) ; CAS Pioneer Hundred Talents Program (Chinese Academy of Sciences) ; CAS Pioneer Hundred Talents Program (Chinese Academy of Sciences) ; NSFC ; NSFC ; NSFC ; NSFC ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; Strategic Priority Research Program (B) of CAS ; Strategic Priority Research Program (B) of CAS ; Strategic Priority Research Program (B) of CAS ; Strategic Priority Research Program (B) of CAS ; China Scholarship Council ; China Scholarship Council ; China Scholarship Council ; China Scholarship Council ; CAS Pioneer Hundred Talents Program (Chinese Academy of Sciences) ; CAS Pioneer Hundred Talents Program (Chinese Academy of Sciences) ; CAS Pioneer Hundred Talents Program (Chinese Academy of Sciences) ; CAS Pioneer Hundred Talents Program (Chinese Academy of Sciences) ; NSFC ; NSFC ; NSFC ; NSFC ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; Strategic Priority Research Program (B) of CAS ; Strategic Priority Research Program (B) of CAS ; Strategic Priority Research Program (B) of CAS ; Strategic Priority Research Program (B) of CAS ; China Scholarship Council ; China Scholarship Council ; China Scholarship Council ; China Scholarship Council ; CAS Pioneer Hundred Talents Program (Chinese Academy of Sciences) ; CAS Pioneer Hundred Talents Program (Chinese Academy of Sciences) ; CAS Pioneer Hundred Talents Program (Chinese Academy of Sciences) ; CAS Pioneer Hundred Talents Program (Chinese Academy of Sciences) ; NSFC ; NSFC ; NSFC ; NSFC ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; Strategic Priority Research Program (B) of CAS ; Strategic Priority Research Program (B) of CAS ; Strategic Priority Research Program (B) of CAS ; Strategic Priority Research Program (B) of CAS
源URL[http://ir.iggcas.ac.cn/handle/132A11/98297]  
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Zhao, Liang
作者单位1.Univ Padua, Dipartimento Geosci, Padua, Italy
2.Univ Lyon 1, ENS Lyon, Lab Geol Lyon, CNRS,UMR 5276,LGL TPE, Villeurbanne, France
3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing, Peoples R China
4.Johannes Gutenberg Univ Mainz, Inst Geosci, Mainz, Germany
推荐引用方式
GB/T 7714		 Yang, Jianfeng,Kaus, Boris J. P.,Li, Yang,et al. Lower Crustal Rheology Controls the Development of Large Offset Strike-Slip Faults During the Himalayan-Tibetan Orogeny[J]. GEOPHYSICAL RESEARCH LETTERS,2020,47(18):11.
APA Yang, Jianfeng.,Kaus, Boris J. P..,Li, Yang.,Leloup, Philippe Herve.,Popov, Anton A..,...&Zhao, Liang.(2020).Lower Crustal Rheology Controls the Development of Large Offset Strike-Slip Faults During the Himalayan-Tibetan Orogeny.GEOPHYSICAL RESEARCH LETTERS,47(18),11.
MLA Yang, Jianfeng,et al."Lower Crustal Rheology Controls the Development of Large Offset Strike-Slip Faults During the Himalayan-Tibetan Orogeny".GEOPHYSICAL RESEARCH LETTERS 47.18(2020):11.

入库方式： OAI收割

来源：地质与地球物理研究所

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