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Spatial and temporal evolution of tectonometamorphic discontinuities in the central Himalaya: Constraints from P-T paths and geochronology

文献类型：期刊论文

作者Wang, Jia-Min1,2; Zhang, Jin-Jiang2; Liu, Kai2; Zhang, Bo2; Wang, Xiao-Xian3; Rai, SantaMan4; Scheltens, Mark2
刊名TECTONOPHYSICS
出版日期2016-06-04
卷号679页码:41-60
关键词Himalaya South Tibetan Detachment Main Central Thrust High Himalayan Discontinuity P-T pseudosections U-Pb geochronology
DOI10.1016/j.tecto.2016.04.035
文献子类Article
英文摘要Recent studies evoke dispute whether the Greater Himalayan Crystalline Complex (GHC) was exhumed during more than one phase. This contribution investigates the timing of ductile shear along the South Tibetan Detachment (STD), Main Central Thrust (MCT), and hidden discontinuities within the GHC of the central Himalaya. New data from the Nyalam transect, southern Tibet, suggest that ductile shear along the STD was active from similar to 27-25 Ma to similar to 17-15 Ma, whereas ductile shear along the MCT was active from similar to 19-16 Ma to similar to 10-8 Ma. Pseudosection modeling results and published metamorphic ages indicate a P-T-t path discontinuity within the GHC and the upper GHC reached higher peak metamorphic temperatures (Delta T 100 degrees C), similar peak pressures and older metamorphic ages (similar to 5-10 Myr), in favor of the presence of the Nyalam Discontinuity. Summarized results from literature suggest that timing of ductile shear along the STD was similar to 5-10 Myr earlier than that along the MCT across the Nepal, Sikkim and Bhutan Himalayas. In addition, the GHC in Nepal can be separated into two portions by a regional-scale (>800 km) in-sequence ductile shear zone the High Himalayan Discontinuity. This shear zone was active coevally with the STD during 25-16 Ma, but similar to 5-10 Myr earlier than the MCT. The High Himalayan Discontinuity could possibly extend to the Sikkim Himalayas, but ends in Bhutan. The identified new architecture suggests that both in-sequence and out-of-sequence tectonometamorphic discontinuities are important components that formed the duplexing structure of the GHC in the central and eastern Himalaya, thus calling for more sophisticated numerical simulation than the current models such as the channel flow and critical taper. (C) 2016 Elsevier B.V. All rights reserved.
WOS关键词MAIN CENTRAL THRUST ; SOUTH TIBETAN DETACHMENT ; CENTRAL NEPAL HIMALAYA ; EAST-CENTRAL NEPAL ; MINERAL EQUILIBRIA CALCULATIONS ; LANGTANG-NATIONAL-PARK ; TEMPERATURE-TIME PATH ; CHANNEL FLOW MODELS ; BHUTAN HIMALAYA ; U-PB
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000378177700004
资助机构National Natural Science Foundation of China(41172176 ; National Natural Science Foundation of China(41172176 ; National Natural Science Foundation of China(41172176 ; National Natural Science Foundation of China(41172176 ; China Geological Survey(12120115027101) ; China Geological Survey(12120115027101) ; China Geological Survey(12120115027101) ; China Geological Survey(12120115027101) ; China Postdoctoral Science Foundation-Chinese Academy of Sciences joint grant ; China Postdoctoral Science Foundation-Chinese Academy of Sciences joint grant ; China Postdoctoral Science Foundation-Chinese Academy of Sciences joint grant ; China Postdoctoral Science Foundation-Chinese Academy of Sciences joint grant ; 41130313 ; 41130313 ; 41130313 ; 41130313 ; 41402175) ; 41402175) ; 41402175) ; 41402175) ; National Natural Science Foundation of China(41172176 ; National Natural Science Foundation of China(41172176 ; National Natural Science Foundation of China(41172176 ; National Natural Science Foundation of China(41172176 ; China Geological Survey(12120115027101) ; China Geological Survey(12120115027101) ; China Geological Survey(12120115027101) ; China Geological Survey(12120115027101) ; China Postdoctoral Science Foundation-Chinese Academy of Sciences joint grant ; China Postdoctoral Science Foundation-Chinese Academy of Sciences joint grant ; China Postdoctoral Science Foundation-Chinese Academy of Sciences joint grant ; China Postdoctoral Science Foundation-Chinese Academy of Sciences joint grant ; 41130313 ; 41130313 ; 41130313 ; 41130313 ; 41402175) ; 41402175) ; 41402175) ; 41402175)
源URL[http://ir.iggcas.ac.cn/handle/132A11/53410]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
2.Peking Univ, Sch Earth & Space Sci, Key Lab Orogen Belts & Crustal Evolut, Beijing 100871, Peoples R China
3.China Earthquake Adm, Inst Crustal Dynam, Beijing 100085, Peoples R China
4.Tribhuvan Univ, Dept Geol, Trichandra Campus, Kathmandu, Nepal
推荐引用方式
GB/T 7714		 Wang, Jia-Min,Zhang, Jin-Jiang,Liu, Kai,et al. Spatial and temporal evolution of tectonometamorphic discontinuities in the central Himalaya: Constraints from P-T paths and geochronology[J]. TECTONOPHYSICS,2016,679:41-60.
APA Wang, Jia-Min.,Zhang, Jin-Jiang.,Liu, Kai.,Zhang, Bo.,Wang, Xiao-Xian.,...&Scheltens, Mark.(2016).Spatial and temporal evolution of tectonometamorphic discontinuities in the central Himalaya: Constraints from P-T paths and geochronology.TECTONOPHYSICS,679,41-60.
MLA Wang, Jia-Min,et al."Spatial and temporal evolution of tectonometamorphic discontinuities in the central Himalaya: Constraints from P-T paths and geochronology".TECTONOPHYSICS 679(2016):41-60.

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来源：地质与地球物理研究所

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