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The rheology and deformation of the South Tibetan Detachment System as exposed at Zherger La, east-central Himalaya: Implications for exhumation of the Himalayan metamorphic core
Zhang, Lei1; Zhang, Bo1; Zhang, Jinjiang1; Wang, Jiamin2; Cai, Fulong3; Zhao, Zhongbao4; Chen, Siyu1; Li, Xiaorong1
2022-04-01
Source PublicationJOURNAL OF STRUCTURAL GEOLOGY
ISSN0191-8141
Volume157Pages:21
AbstractDeformation processes and rheological changes within the South Tibetan Detachment System (STDS) played a key role in accommodating exhumation of the Greater Himalayan Sequence (GHS). We present a study for the STDS in Zherger La, Yadong region, east-central Himalaya, to better quantify the spatial and temporal variations of the shear zone's internal deformation and rheology properties. Quartz microstructures and crystallographic preferred orientations, together with quantitative estimates of deformation temperatures, differential stresses, strain rates and viscosities are deduced from the ductile segment of the detachment zone. The mylonites that comprise the exposed shear zone preserve a range of deformation conditions that are interpreted in terms of progressive exhumation. Strain localization within the STDS is indicated by the microstructural evolution from penetrative deformation of constitutive minerals to localized deformation into quartz, which exhibit interconnected networks and high strain zones. Deformation temperatures decrease from 510 +/- 40 to 405 +/- 50 degrees C and differential stresses increase from 24 to 100 MPa structurally upwards, as indicated by two-feldspar thermometry and quartz paleopiezometry, respectively. Strain rates derived from quartz dislocation creep flow law are on the order of 10(-12)-10(-13) s(-1) and are broadly consistent with macrostructurally-derived strain rates of 1.8-5.1 x 10(-13) s(-1), which are calculated from previously determined exhumation rates and shear zone width. The estimated differential stresses and strain rates are further utilized to determine the variation of viscosities across the STDS. The viscosities within the STDS range at 10(19)-10(20) Pa s. In conjunction with the published numerical modelling and analog modeling studies, the estimated viscosity data are compatible with the channel flow model for exhumation.
KeywordSouth Tibetan detachment system Rheology Microstructures Deformation process Exhumation mechanism
DOI10.1016/j.jsg.2022.104559
Funding OrganizationNational science foundation of China (NSFC) ; National science foundation of China (NSFC) ; Second Tibetan Plateau Scientific Expedi-tion and Research (STEP) program ; Second Tibetan Plateau Scientific Expedi-tion and Research (STEP) program ; National science foundation of China (NSFC) ; National science foundation of China (NSFC) ; Second Tibetan Plateau Scientific Expedi-tion and Research (STEP) program ; Second Tibetan Plateau Scientific Expedi-tion and Research (STEP) program ; National science foundation of China (NSFC) ; National science foundation of China (NSFC) ; Second Tibetan Plateau Scientific Expedi-tion and Research (STEP) program ; Second Tibetan Plateau Scientific Expedi-tion and Research (STEP) program ; National science foundation of China (NSFC) ; National science foundation of China (NSFC) ; Second Tibetan Plateau Scientific Expedi-tion and Research (STEP) program ; Second Tibetan Plateau Scientific Expedi-tion and Research (STEP) program
WOS KeywordANNAPURNA-DHAULAGIRI HIMALAYA ; CENTRAL THRUST ZONE ; U-PB ZIRCON ; CHANNEL FLOW ; CENTRAL NEPAL ; SHEAR ZONE ; TECTONIC IMPLICATIONS ; STRUCTURAL GEOMETRY ; DISLOCATION CREEP ; ROCK DEFORMATION
Language英语
Funding ProjectNational science foundation of China (NSFC)[41772207] ; Second Tibetan Plateau Scientific Expedi-tion and Research (STEP) program[2019QZKK0703]
Funding OrganizationNational science foundation of China (NSFC) ; National science foundation of China (NSFC) ; Second Tibetan Plateau Scientific Expedi-tion and Research (STEP) program ; Second Tibetan Plateau Scientific Expedi-tion and Research (STEP) program ; National science foundation of China (NSFC) ; National science foundation of China (NSFC) ; Second Tibetan Plateau Scientific Expedi-tion and Research (STEP) program ; Second Tibetan Plateau Scientific Expedi-tion and Research (STEP) program ; National science foundation of China (NSFC) ; National science foundation of China (NSFC) ; Second Tibetan Plateau Scientific Expedi-tion and Research (STEP) program ; Second Tibetan Plateau Scientific Expedi-tion and Research (STEP) program ; National science foundation of China (NSFC) ; National science foundation of China (NSFC) ; Second Tibetan Plateau Scientific Expedi-tion and Research (STEP) program ; Second Tibetan Plateau Scientific Expedi-tion and Research (STEP) program
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000805225100001
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/106064
Collection岩石圈演化国家重点实验室
Corresponding AuthorZhang, Bo
Affiliation1.Peking Univ, Sch Earth & Space Sci, Key Lab Orogen Belts & Crustal Evolut, Beijing 100871, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
3.Chinese Acad Sci, Inst Tibetan Plateau Res, Beijing 100101, Peoples R China
4.Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China
Recommended Citation
GB/T 7714
Zhang, Lei,Zhang, Bo,Zhang, Jinjiang,et al. The rheology and deformation of the South Tibetan Detachment System as exposed at Zherger La, east-central Himalaya: Implications for exhumation of the Himalayan metamorphic core[J]. JOURNAL OF STRUCTURAL GEOLOGY,2022,157:21.
APA Zhang, Lei.,Zhang, Bo.,Zhang, Jinjiang.,Wang, Jiamin.,Cai, Fulong.,...&Li, Xiaorong.(2022).The rheology and deformation of the South Tibetan Detachment System as exposed at Zherger La, east-central Himalaya: Implications for exhumation of the Himalayan metamorphic core.JOURNAL OF STRUCTURAL GEOLOGY,157,21.
MLA Zhang, Lei,et al."The rheology and deformation of the South Tibetan Detachment System as exposed at Zherger La, east-central Himalaya: Implications for exhumation of the Himalayan metamorphic core".JOURNAL OF STRUCTURAL GEOLOGY 157(2022):21.
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