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DOI	10.1144/SP412.11
	New constraints on the timing of partial melting and deformation along the Nyalam section (central Himalaya): implications for extrusion models
	Leloup, Philippe Herve; Liu, Xiaobing; Maheo, Gweltaz; Paquette, Jean-Louis; Arnaud, Nicolas; Aubray, Alexandre; Liu, Xiaohan
通讯作者	Leloup, PH (通讯作者)
发表日期	2015
ISSN	0305-8719
起始页码	131
结束页码	175
卷号	412
英文摘要	New structural, U-Th/Pb and Ar/Ar data along the Nyalam section constrain the timing of partial melting, crystallization and deformation in the Greater Himalayan Sequence. Prograde metamorphism was followed by the onset of partial melting at c. 30 Ma. In the central Greater Himalayan Sequence, in situ melts crystallized between 24 and 18 Ma. Subsequent cooling was very fast (c. 200 degrees C Ma(-1)) and coeval with the emplacement of undeformed dykes that lasted until c. 15 Ma. In the upper Greater Himalayan Sequence, fast cooling continued until c. 13 Ma. Combined with published P-T and thermochronological data from the Langtang and Dudh Kosi valleys, these data imply that: (a) the partial melt zone thinned over time; (b) the end of melting preceded the end of motion on the Main Central Thrust and the South Tibetan Detachment by 6 and 2 Ma, respectively; (c) the South Tibetan Detachment possibly initiated at c. 25 Ma, probably reactivating a pre-existing thrust; and (d) the present-day topography has been established for,6 Ma and focused erosion on the present-day southern slopes of the Himalaya was not active at the time of the exhumation of the Greater Himalayan Sequence. These observations suggest that the Main Central Thrust/South Tibetan Detachment systems are not passive structures induced by focused erosion, as has been suggested previously by some lower crustal channel flow models.
关键词	SOUTH TIBETAN DETACHMENT MAIN CENTRAL THRUST LANGTANG-NATIONAL-PARK U-PB ISOTOPE CENTRAL NEPAL EVEREST REGION METAMORPHIC CORE IN-SITU MANASLU LEUKOGRANITE CRYSTALLINE SEQUENCE
语种	英语
WOS研究方向	Geology
WOS类目	Geology
WOS记录号	WOS:000359401900010
来源期刊	TECTONICS OF THE HIMALAYA
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/258603
推荐引用方式 GB/T 7714	Leloup, Philippe Herve,Liu, Xiaobing,Maheo, Gweltaz,et al. New constraints on the timing of partial melting and deformation along the Nyalam section (central Himalaya): implications for extrusion models[J]. 中国科学院青藏高原研究所,2015,412.
APA	Leloup, Philippe Herve.,Liu, Xiaobing.,Maheo, Gweltaz.,Paquette, Jean-Louis.,Arnaud, Nicolas.,...&Liu, Xiaohan.(2015).New constraints on the timing of partial melting and deformation along the Nyalam section (central Himalaya): implications for extrusion models.TECTONICS OF THE HIMALAYA,412.
MLA	Leloup, Philippe Herve,et al."New constraints on the timing of partial melting and deformation along the Nyalam section (central Himalaya): implications for extrusion models".TECTONICS OF THE HIMALAYA 412(2015).