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

doi:10.1016/j.tecto.2016.04.035

CORC > 北京大学 > 地球与空间科学学院

	Spatial and temporal evolution of tectonometamorphic discontinuities in the central Himalaya: Constraints from P-T paths and geochronology
	Wang, Jia-Min ; Zhang, Jin-Jiang ; Liu, Kai ; Zhang, Bo ; Wang, Xiao-Xian ; Rai, SantaMan ; Scheltens, Mark
刊名	TECTONOPHYSICS
	2016
关键词	Himalaya South Tibetan Detachment Main Central Thrust High Himalayan Discontinuity P-T pseudosections U-Pb geochronology 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
DOI	10.1016/j.tecto.2016.04.035
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.; National Natural Science Foundation of China [41172176, 41130313, 41402175]; China Geological Survey [12120115027101]; China Postdoctoral Science Foundation-Chinese Academy of Sciences joint grant; SCI(E); EI; ARTICLE; wangjiamin@mail.iggcas.ac.cn; 41-60; 679
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/437149]
专题	地球与空间科学学院
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.
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.
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 (2016).