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DOI	10.1029/2009TC002551
	Exhumation history of the deepest central Himalayan rocks, Ama Drime range: Key pressure-temperature-deformation-time constraints on orogenic models
	Kali, E.; Leloup, P. H.; Arnaud, N.; Maheo, G.; Liu, Dunyi; Boutonnet, E.; Van der Woerd, J.; Liu, Xiaohan; Jing Liu-Zeng; Li, Haibing
通讯作者	Kali, E (通讯作者)
发表日期	2010
ISSN	0278-7407
EISSN	1944-9194
卷号	29
英文摘要	The Ama Drime range located at the transition between the high Himalayan range and south Tibet is a N-S active horst that offsets the South Tibetan Detachment System (STDS). Within the horst, a paragneissic unit, possibly attributed to the upper Himalayan crystalline series, overly the lower Himalayan crystalline series Ama Drime orthogneissic unit containing large metabasite layers and pods that have experienced pressure >= 1.4 GPa. Combining structural analysis with new and published pressure-temperature (P-T) estimates as well as U-Th/Pb, Ar-39/Ar-40 and (U-Th)/He ages, the P-T-deformation-time (P-T-D-t) paths of the main units within and on both sides of the horst are reconstructed. They imply that N-S normal faults initiated prior to 11 Ma and have accounted for a total exhumation <= 0.6 GPa (22 km) that probably occurred in two phases: the first one until similar to 9 Ma and the second one since 6 to 4 Ma at a rate of similar to 1 mm/yr. In the Ama Drime unit, 1 to 1.3 GPa (37 to 48 km) of exhumation occurred after partial melting since similar to 30 Ma until similar to 13 Ma, above the Main Central Trust (MCT) and below the STDS when these two fault systems were active together. The switch from E-W (STDS) to N-S (Ama Drime horst) normal faulting between 13 and 12 Ma occurs at the time of propagation of thrusting from the MCT to the Main Boundary Thrust. These data are in favor of a wedge extrusion or thrust system rather than a crustal flow model for the building of the Himalaya. We propose that the kinematics of south Tibet Cenozoic extension phases is fundamentally driven by the direction and rate of India underthrusting. Citation: Kali, E., P. H. Leloup, N. Arnaud, G. Maheo, D. Liu, E. Boutonnet, J. Van der Woerd, X. Liu, J. Liu-Zeng, and H. Li (2010), Exhumation history of the deepest central Himalayan rocks, Ama Drime range: Key pressure-temperature-deformationtime constraints on orogenic models, Tectonics, 29, TC2014, doi:10.1029/2009TC002551.
关键词	MAIN CENTRAL THRUST TIBETAN DETACHMENT SYSTEM EASTERN NEPAL HIMALAYA SOUTHERN TIBET INVERTED METAMORPHISM TECTONIC EVOLUTION SHEAR ZONE PETROLOGICAL CONSTRAINTS PROGRADE METAMORPHISM ZIRCON GEOCHRONOLOGY
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000276831700002
来源期刊	TECTONICS
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/257836
推荐引用方式 GB/T 7714	Kali, E.,Leloup, P. H.,Arnaud, N.,et al. Exhumation history of the deepest central Himalayan rocks, Ama Drime range: Key pressure-temperature-deformation-time constraints on orogenic models[J]. 中国科学院青藏高原研究所,2010,29.
APA	Kali, E..,Leloup, P. H..,Arnaud, N..,Maheo, G..,Liu, Dunyi.,...&Li, Haibing.(2010).Exhumation history of the deepest central Himalayan rocks, Ama Drime range: Key pressure-temperature-deformation-time constraints on orogenic models.TECTONICS,29.
MLA	Kali, E.,et al."Exhumation history of the deepest central Himalayan rocks, Ama Drime range: Key pressure-temperature-deformation-time constraints on orogenic models".TECTONICS 29(2010).