中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
首页 机构 成果 学者
  
  1. CAS IR Grid
  2. 地质与地球物理研究所
  3. 中国科学院地质与地球物理研究所
  4. 岩石圈演化国家重点实验室
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

文献类型：期刊论文

作者Zhang, Lei4; Zhang, Bo4; Zhang, Jinjiang4; Wang, Jiamin3; Cai, Fulong2; Zhao, Zhongbao1; Chen, Siyu4; Li, Xiaorong4
刊名JOURNAL OF STRUCTURAL GEOLOGY
出版日期2022-04-01
卷号157页码:21
关键词South Tibetan detachment system Rheology Microstructures Deformation process Exhumation mechanism
ISSN号0191-8141
DOI10.1016/j.jsg.2022.104559
英文摘要Deformation 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.
WOS关键词ANNAPURNA-DHAULAGIRI HIMALAYA ; CENTRAL THRUST ZONE ; U-PB ZIRCON ; CHANNEL FLOW ; CENTRAL NEPAL ; SHEAR ZONE ; TECTONIC IMPLICATIONS ; STRUCTURAL GEOMETRY ; DISLOCATION CREEP ; ROCK DEFORMATION
资助项目National science foundation of China (NSFC)[41772207] ; Second Tibetan Plateau Scientific Expedi-tion and Research (STEP) program[2019QZKK0703]
WOS研究方向Geology
语种英语
WOS记录号WOS:000805225100001
出版者PERGAMON-ELSEVIER SCIENCE LTD
资助机构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 ; 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
源URL[http://ir.iggcas.ac.cn/handle/132A11/106064]  
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Zhang, Bo
作者单位1.Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China
2.Chinese Acad Sci, Inst Tibetan Plateau Res, Beijing 100101, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
4.Peking Univ, Sch Earth & Space Sci, Key Lab Orogen Belts & Crustal Evolut, Beijing 100871, Peoples R China
推荐引用方式
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.

入库方式： OAI收割

来源：地质与地球物理研究所

浏览0
下载0
收藏0
其他版本

除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。