Genesis and tectonic significance of the Early Jurassic magmatic rocks;from the southern Lhasa terrane

	Genesis and tectonic significance of the Early Jurassic magmatic rocks;from the southern Lhasa terrane
	Dong Xin 2; Zhang ZeMing
刊名	ACTA PETROLOGICA SINICA
	2013
卷号	29 期号:6 页码:1933-1948
关键词	Lhasa terrane Early Jurassic Magmatism Petrology Chronology
ISSN号	1000-0569
英文摘要	This paper reports a suit of the Early Jurassic magmatic rocks, which were interpreted previously as the Precambrian metamorphic basement of the Lhasa terrane. The zircon U-Pb chronology indicates that these magmatic rocks crystallized at the Early Jurassic of 202Ma to 180Ma. These magmatic rocks include gabbro-diorite, monzonite and granodiorite, and belong to intermediate-acid, metaluminous, calc-alkaline and I type granitoids. The trace elements of the magmatic rocks are rich in large ion lithophile elements and depleted in high field strength elements, with volcanic arc granite affinity. The Hf isotope composition of zircon suggests that the intermediate-acid rocks from Jiacha were derived from the melting of the juvenile crust, the mafic rock from Jiacha from the melting of depleted mantle, whereas the acid rocks from Sangri were derived from the reworking of old crust. We account that the Late Triassic to Early Jurassic magmatic rocks in the southern Lhasa subterrane, including the rocks of this study, are the products of the melting of mantle wedge with the overlying crust heated by the upwelling asthenospheric mantle that caused by the breaking off or rolling back of Sumdo oceanic crust subducted beneath the southern Lhasa subterrane.
学科主题	火成岩岩石学
WOS关键词	ZIRCON U-PB ; EASTERN HIMALAYAN SYNTAXIS ; GANGDESE BATHOLITH ; CRUSTAL ; EVOLUTION ; TIBETAN PLATEAU ; TRACE-ELEMENTS ; ICP-MS ; HF ; METAMORPHISM ; CONSTRAINTS
WOS研究方向	Geology
语种	中文
出版者	SCIENCE PRESS
WOS记录号	WOS:000322427000006
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/40149]
专题	中国地质科学院地质研究所
作者单位	1.Chinese Acad Geol Sci, Inst Geol, State Key Lab Continental Tecton & Dynam, Beijing 100037, Peoples R China. 2.中国地质科学院地质研究所
推荐引用方式 GB/T 7714	Dong Xin,Zhang ZeMing. Genesis and tectonic significance of the Early Jurassic magmatic rocks;from the southern Lhasa terrane[J]. ACTA PETROLOGICA SINICA,2013,29(6):1933-1948.
APA	Dong Xin,&Zhang ZeMing.(2013).Genesis and tectonic significance of the Early Jurassic magmatic rocks;from the southern Lhasa terrane.ACTA PETROLOGICA SINICA,29(6),1933-1948.
MLA	Dong Xin,et al."Genesis and tectonic significance of the Early Jurassic magmatic rocks;from the southern Lhasa terrane".ACTA PETROLOGICA SINICA 29.6(2013):1933-1948.