Sr-Nd-Pb and zircon Hf isotopic constraints on petrogenesis of the Late Jurassic granitic porphyry at Qulong, Tibet

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	Sr-Nd-Pb and zircon Hf isotopic constraints on petrogenesis of the Late Jurassic granitic porphyry at Qulong, Tibet
	Yang, ZM (Yang ZhiMing); Hou, ZQ (Hou ZengQian); Jiang, YF (Jiang YingFei); Zhang, HR (Zhang HongRui); Song, YC (Song YuCai)
刊名	ACTA PETROLOGICA SINICA
	2011
卷号	27 期号:7 页码:2003-2010
关键词	Sr-Nd-Pb-Hf isotope Jurassic granite Regional comparison Gangdese Tibet
ISSN号	1000-0569
英文摘要	Recent investigations indicate there is a Late Triassic-Early Jurassic granite belt in the southern margin of the Lhasa terrane. Their petrogenesis is important to understand Mesozoic evolution history of Tibet plateau, but has not been well constrained by far. In the study, we report Sr-Nd-Pb and zircon isotopic compositions of the Late Jurassic granitic porphyries at Qulong, Tibet. The results show that the granitic porphyries have relatively low initial (87)Sr/(86)Sr values (0.7029 similar to 0.7050), slightly negative to positive epsilon(Nd)(t) values (-0.1 similar to 1.2), and positive zircon epsilon(Hf)(t) values (2.6 similar to 8.2), suggesting the magma was derived from partial melting of juvenile crust. By comparison with already-reported Hf (and part Sr-Nd) isotopic data of the Late Triassic-Early Jurassic granite, we find that the epsilon(Hf)(t) values of zircons from these granites decrease from west (Xietongmen) to east (Milin) in a 500km-wide belt, indicating contribution of mature crustal composition in formation of the granite increases from west to east. This probably attributes to heterogeneous Hf isotopic compositions of crystalline basement of south Lhasa subterrane at Late Triassic-Early Jurassic. However, geographical factor should also not be excluded because that the eastern granites (e. g., Qulong, Milin) are closer to the old central Lhasa subterrane, and thus easily result in involvement of more mature crustal material in their magma source.
学科主题	火成岩岩石学
WOS关键词	U-PB ; SOUTHERN TIBET ; VOLCANIC-ROCKS ; GANGDESE BATHOLITH ; LU-HF ; EVOLUTION ; GEOCHRONOLOGY ; TETHYS ; ORIGIN ; MANTLE
WOS研究方向	Geology
语种	中文
出版者	SCIENCE PRESS
WOS记录号	WOS:000293800900009
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/39408]
专题	中国地质调查局
作者单位	Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China
推荐引用方式 GB/T 7714	Yang, ZM ,Hou, ZQ ,Jiang, YF ,et al. Sr-Nd-Pb and zircon Hf isotopic constraints on petrogenesis of the Late Jurassic granitic porphyry at Qulong, Tibet[J]. ACTA PETROLOGICA SINICA,2011,27(7):2003-2010.
APA	Yang, ZM ,Hou, ZQ ,Jiang, YF ,Zhang, HR ,&Song, YC .(2011).Sr-Nd-Pb and zircon Hf isotopic constraints on petrogenesis of the Late Jurassic granitic porphyry at Qulong, Tibet.ACTA PETROLOGICA SINICA,27(7),2003-2010.
MLA	Yang, ZM ,et al."Sr-Nd-Pb and zircon Hf isotopic constraints on petrogenesis of the Late Jurassic granitic porphyry at Qulong, Tibet".ACTA PETROLOGICA SINICA 27.7(2011):2003-2010.