Episodic crustal anatexis and the formation of Paiku composite;leucogranitic pluton in the Malashan Gneiss Dome, Southern Tibet

doi:10.1007/s11434-013-5792-4

	Episodic crustal anatexis and the formation of Paiku composite;leucogranitic pluton in the Malashan Gneiss Dome, Southern Tibet
	Gao LiE 4; Zeng LingSen ; Hou KeJun 1; Guo ChunLi 1; Tang SuoHan ; Xie KeJia 2; Hu GuYue 1; Wang Li
刊名	CHINESE SCIENCE BULLETIN
	2013
卷号	58 期号:28-29 页码:3546-3563
关键词	Himalayan orogenic belt Northern Himalayan Gneiss Domes leucogranite crustal anatexis tectonic transition
ISSN号	1001-6538;EI 1861-9541
DOI	10.1007/s11434-013-5792-4
英文摘要	The Paiku composite leucogranitic pluton in the Malashan gneiss dome within the Tethyan Himalaya consists of tourmaline leucogranite, two-mica granite and garnet-bearing leucogranite. Zircon U-Pb dating yields that (1) tourmaline leucogranite formed at 28.2 +/- 0.5 Ma and its source rock experienced simultaneous metamorphism and anatexis at 33.6 +/- 0.6 Ma; (2) two-mica granite formed at 19.8 +/- 0.5 Ma; (3) both types of leucogranite contain inherited zircon grains with an age peak at similar to 480 Ma. These leucogranites show distinct geochemistry in major and trace elements as well as in Sr-Nd-Hf isotope compositions. As compared to the two-mica granites, the tourmaline ones have higher initial Sr and zircon Hf isotope compositions, indicating that they were derived from different source rocks combined with different melting reactions. Combined with available literature data, it is suggested that anatexis at similar to 35 Ma along the Himalayan orogenic belt might have triggered the initial movement of the Southern Tibetan Detachment System (STDS), and led to the tectonic transition from compressive shortening to extension. Such a tectonic transition could be a dominant factor that initiates large scale decompressional melting of fertile high-grade metapelites along the Himalayan orogenic belt. Crustal anatexis at similar to 28 Ma and similar to 20 Ma represent large-scale melting reactions associated with the movement of the STDS.
学科主题	火成岩岩石学
WOS关键词	NATURAL REFERENCE MATERIAL ; PLASMA-MASS SPECTROMETRY ; U-PB ; GEOLOGICAL ; IMPLICATIONS ; TECTONIC EVOLUTION ; DETACHMENT SYSTEM ; HIMALAYAN OROGEN ; NORTH HIMALAYA ; NEPAL HIMALAYA ; GRANITIC MELTS
WOS研究方向	Science & Technology - Other Topics
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000325689600016
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/40150]
专题	中国地质科学院地质研究所
作者单位	1.Chinese Acad Geol Sci, State Key Lab Continental Tecton & Dynam, Inst Geol, Beijing 100037, Peoples R China. 2.Chinese Acad Geol Sci, Inst Mineral Resources, Beijing 100037, Peoples R China. 3.Nonferrous Mineral Explorat Engn Res Ctr Henan Pr, Zhengzhou 450016, Peoples R China. 4.中国地质科学院地质研究所
推荐引用方式 GB/T 7714	Gao LiE,Zeng LingSen,Hou KeJun,et al. Episodic crustal anatexis and the formation of Paiku composite;leucogranitic pluton in the Malashan Gneiss Dome, Southern Tibet[J]. CHINESE SCIENCE BULLETIN,2013,58(28-29):3546-3563.
APA	Gao LiE.,Zeng LingSen.,Hou KeJun.,Guo ChunLi.,Tang SuoHan.,...&Wang Li.(2013).Episodic crustal anatexis and the formation of Paiku composite;leucogranitic pluton in the Malashan Gneiss Dome, Southern Tibet.CHINESE SCIENCE BULLETIN,58(28-29),3546-3563.
MLA	Gao LiE,et al."Episodic crustal anatexis and the formation of Paiku composite;leucogranitic pluton in the Malashan Gneiss Dome, Southern Tibet".CHINESE SCIENCE BULLETIN 58.28-29(2013):3546-3563.