Himalayan leucogranite: Petrogenesis and implications to orogenesis and plateau uplift

	Himalayan leucogranite: Petrogenesis and implications to orogenesis and plateau uplift
	Wu FuYuan; Liu ZhiChao; Liu XiaoChi; Ji WeiQiang
刊名	ACTA PETROLOGICA SINICA
	2015
卷号	31 期号:1 页码:1-36
关键词	Crustal channel flow Highly fractional crystallization Leucogranite Himalaya
ISSN号	1000-0569
文献子类	Article
英文摘要	The Himalayan orogenic belt is characterized by widespread of leucogranites which are mostly peraluminous with mafic mineral less than 5%. Two sub-parallel belts, i.e., Higher Himalayan and Tethyan Himalayan, have been recognized according to their distribution. Petrologically, this kind of granitic rocks can be classified as three sub-groups of muscovite-, tourmaline- and garnet-bearing rocks. It was previously thought that the Himalayan leucogranite was formed during India-Asia continental collision by in situ partial melting of the Higher Himalayan paragneisses at amphibolite- to granulite-facies metamorphic conditions, since it locates near the minimum eutectic point in the granitic Q-Ab-Or system. It was also proposed that the muscovite-granite was formed at higher temperature than those of the tourmaline- and garnet-bearing granites. However, the detailed investigations indicate that this granite might be in fact a kind of high temperature magma, which had undergone an intensive crystal fractionation, and could be considered as an end-member of fractionated granites on our Earth. It is almost impossible to constrain its genetic type due to later fractional crystallization although it is mostly accepted that it is an S-type granite of purely crustal derived. The available geochronological data indicate that this granite can be subdivided into Eohimalayan, Neohimalayan and Posthimalayan with a duration of similar to 40Ma. The Eohimalayan(44 similar to 26Ma) leucogranite was formed during the India-Asia collision and subsequent slab breakoff, and the Neohimalayan (26 similar to 13Ma), as the main part of the Himalayan leucogranites, is closely related to delamination of the thickened Himalaya-Tibetan Plateau and induced exhumation of the subducted Higher Himalayan material. The Posthimalayan(13 similar to 7Ma) was probably resulted from the east-west extension during the ongoing convergence. Whatever, the Himalayan leucogranite cannot be considered as a representive of syn-collisional granitic magmatism in the continental-continental collisional zones. In addition, no documentation is found from these leucogranites to support model of the crustal channel flow beneath the Himalaya-Tibetan Plateau. In contrast, the partial melting of the subducted Higher Himalaya in depth, and the subsequent fractional crystallization associated with the exhumation of the partially molten rocks is more reasonably to be used to explain the development of the Himalayan leucogranites and their source characters.
WOS关键词	SOUTH TIBETAN DETACHMENT ; EAST-WEST EXTENSION ; S-TYPE GRANITES ; U-PB GEOCHRONOLOGY ; CONTINENTAL COLLISION ZONES ; HF ISOTOPIC CONSTRAINTS ; CENTRAL NEPAL MANASLU ; MALASHAN GNEISS DOME ; INDO-ASIAN COLLISION ; TETRAD REE PATTERNS
WOS研究方向	Geology
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000349509300001
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/86982]
专题	中国科学院地质与地球物理研究所
通讯作者	Wu FuYuan
作者单位	Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Wu FuYuan,Liu ZhiChao,Liu XiaoChi,et al. Himalayan leucogranite: Petrogenesis and implications to orogenesis and plateau uplift[J]. ACTA PETROLOGICA SINICA,2015,31(1):1-36.
APA	Wu FuYuan,Liu ZhiChao,Liu XiaoChi,&Ji WeiQiang.(2015).Himalayan leucogranite: Petrogenesis and implications to orogenesis and plateau uplift.ACTA PETROLOGICA SINICA,31(1),1-36.
MLA	Wu FuYuan,et al."Himalayan leucogranite: Petrogenesis and implications to orogenesis and plateau uplift".ACTA PETROLOGICA SINICA 31.1(2015):1-36.