Early Ordovician strongly peraluminous granite in the middle section of the Yarlung Zangbo junction zone and its geological significance

doi:10.1007/s11430-013-4721-3

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	Early Ordovician strongly peraluminous granite in the middle section of the Yarlung Zangbo junction zone and its geological significance
	Zhang ShiZhen 2; Li FenQi ; Li Yong ; Liu Wei ; Qin YaDong
刊名	SCIENCE CHINA-EARTH SCIENCES
	2014
卷号	57 期号:4 页码:630-643
关键词	Yarlung Zangbo Junction Zone Early Ordovician strongly peraluminous granite collisional setting crustal basement
ISSN号	1674-7313
DOI	10.1007/s11430-013-4721-3
英文摘要	LA-ICP-MS zircon U-Pb isotopic dating and rock geochemical analysis were done of the Xarru granite in the middle section of the Yarlung Zangbo junction zone. Zircon Pb-206/U-238 weighted mean ages of 474.9 +/- 2.3 and 478.3 +/- 1.7 Ma have been obtained for two gneiss granite samples respectively, which represent the formation age of the granite. This is the first discovery of the Early Ordovician magmatism in the Yarlung Zangbo junction zone. The rocks are high-K calcic-alkalic granite, contain tourmaline but not hornblende, with aluminum saturation index (ASI) of A/CNK > 1.1 (1.10-1.20), and are enriched in Rb, Th and U and relatively depleted in Ba, Nb, Sr, Zr, Ti and Eu. They are strongly peraluminous S-type granite, resulting from partial melting of argillaceous components in the crust in a syn-collisional setting. According to previous studies as well as the analysis in this paper, the formation of the Xarru granite is probably related to the Andean-type orogeny in the process of subduction of the Proto-Tethys Ocean towards the Gondwanaland, and it is a product of partial melting of the thickened upper crust as a result of collision between blocks or micro-blocks in the northern margin of the Gondwana supercontinent in the process of oceanic subduction. The Xarru granite is identified as the Early Ordovician granite, indicating that the wall rocks had probably formed in the Cambrian or Precambrian. A crustal basement may exist in the Xarru region.
学科主题	火成岩岩石学
WOS关键词	EASTERN HIMALAYAN SYNTAXIS ; U-PB ZIRCON ; HF ISOTOPIC CONSTRAINTS ; NAMCHE BARWA COMPLEX ; A-TYPE GRANITES ; I-TYPE GRANITES ; LA-ICP-MS ; LHASA TERRANE ; PAN-AFRICAN ; TECTONIC IMPLICATIONS
WOS研究方向	Geology
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000334176800006
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/40352]
专题	中国地质调查局成都地质调查中心
作者单位	1.Chengdu Inst Geol & Mineral Resources, Chengdu 610081, Peoples R China 2.中国地质调查局成都地质调查中心
推荐引用方式 GB/T 7714	Zhang ShiZhen,Li FenQi,Li Yong,et al. Early Ordovician strongly peraluminous granite in the middle section of the Yarlung Zangbo junction zone and its geological significance[J]. SCIENCE CHINA-EARTH SCIENCES,2014,57(4):630-643.
APA	Zhang ShiZhen,Li FenQi,Li Yong,Liu Wei,&Qin YaDong.(2014).Early Ordovician strongly peraluminous granite in the middle section of the Yarlung Zangbo junction zone and its geological significance.SCIENCE CHINA-EARTH SCIENCES,57(4),630-643.
MLA	Zhang ShiZhen,et al."Early Ordovician strongly peraluminous granite in the middle section of the Yarlung Zangbo junction zone and its geological significance".SCIENCE CHINA-EARTH SCIENCES 57.4(2014):630-643.