The Mid-Eocene subvolcanic field in the Lhunze-Qiaga area, Tethyan Himalaya, southern Tibet A high-level magmatic suite related to the Yardio two-mica granite

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	The Mid-Eocene subvolcanic field in the Lhunze-Qiaga area, Tethyan Himalaya, southern Tibet A high-level magmatic suite related to the Yardio two-mica granite
	Hu, GY (Hu GuYue); Zeng, LS (Zeng LingSen); Qi, XX (Qi XueXiang); Hou, KJ (Hou KeJun); Gao, L (Gao LiE)
刊名	ACTA PETROLOGICA SINICA
	2011
卷号	27 期号:11 特刊 SI 页码:3308-3318
关键词	Tethyan Himalaya Subvolcanic rocks Zircon U-Pb dating Hydrothermal reactions High U zircon
ISSN号	1000-0569
英文摘要	Recent studies in the Yardoi gneiss dome (YGD) of the Tethyan Himalaya, have demonstrated that the Tethyan Himalayan belt experienced a major episode of crustal melting at Mid-Eocene (44 similar to 40Ma) time, represented by the formation of a suite of high Sr/Y two-mica granites. Further south of YGD, a suite of subvolcanic rocks of rhyolitic composition occurs in the Lhunze-Qiaga area and intruded into black sandstones and yellow-greenish shales of the Tethyan sedimentary sequence. Petrographic observations, zircon U-Pb age and geochemical data show that; (1) the Lhunze-Qiaga rhyolitic subvolcanic rocks formed at ca. 43 similar to 41Ma and may represent the shallow counterpart of the two-mica granites crystallized at a much deeper level; (2) in contrast with the two-mica granites, the subvolcanic rocks had experienced intensive hydrothermal-magmatic interactions as well as An-rich plagioclase fractional crystallization as evidenced by pronounced negative Eu anomalies, much lower Sr concentrations, and enhanced common Pb and U concentrations in the magmatic zircon; and (3) these two suites of rocks formed a Mid-Eocene igneous edifice under crustal thickened conditions.
学科主题	火成岩岩石学
WOS关键词	GEOLOGICAL IMPLICATIONS ; TECTONIC EVOLUTION ; EXHUMATION HISTORY ; CONTINENTAL-CRUST ; CHANNEL FLOW ; GNEISS DOME ; ZIRCON AGES ; ORIGIN ; ANATEXIS ; OROGEN
WOS研究方向	Geology
语种	中文
出版者	SCIENCE PRESS
WOS记录号	WOS:000297822900012
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/39413]
专题	中国地质调查局
作者单位	Chinese Acad Geol Sci, Inst Mineral Resources, Key Lab Metallogeny & Mineral Resource Assessment, Beijing 100037, Peoples R China
推荐引用方式 GB/T 7714	Hu, GY ,Zeng, LS ,Qi, XX ,et al. The Mid-Eocene subvolcanic field in the Lhunze-Qiaga area, Tethyan Himalaya, southern Tibet A high-level magmatic suite related to the Yardio two-mica granite[J]. ACTA PETROLOGICA SINICA,2011,27(11 特刊 SI):3308-3318.
APA	Hu, GY ,Zeng, LS ,Qi, XX ,Hou, KJ ,&Gao, L .(2011).The Mid-Eocene subvolcanic field in the Lhunze-Qiaga area, Tethyan Himalaya, southern Tibet A high-level magmatic suite related to the Yardio two-mica granite.ACTA PETROLOGICA SINICA,27(11 特刊 SI),3308-3318.
MLA	Hu, GY ,et al."The Mid-Eocene subvolcanic field in the Lhunze-Qiaga area, Tethyan Himalaya, southern Tibet A high-level magmatic suite related to the Yardio two-mica granite".ACTA PETROLOGICA SINICA 27.11 特刊 SI(2011):3308-3318.