Petrogenesis of Daxiong pluton in western Gangdese, Tibet: zircon U-Pb dating and Hf isotopic constraints

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	Petrogenesis of Daxiong pluton in western Gangdese, Tibet: zircon U-Pb dating and Hf isotopic constraints
	Zhou, CY (Zhou ChangYong); Zhu, DC (Zhu DiCheng); Zhao, ZD (Zhao ZhiDan); Xu, JF (Xu JiFeng); Wang, LQ (Wang LiQuan); Chen, HH (Chen HaiHong); Xie, LW (Xie LieWen); Dong, GC (Dong GuoChen); Zhou, S (Zhou Su)
刊名	ACTA PETROLOGICA SINICA
	2008
卷号	24 期号:2 页码:348-358
关键词	zircon U-Pb age zircon Hf isotope petrogenesis Daxiong pluton Western Gangdese Tibet
ISSN号	1000-0569
英文摘要	LA-ICP-MS zircon U-Pb age, whole-rock major and trace element, Sr-Nd and zircon Hf isotopic compositions from the Daxiong pluton, western Cangdese are used to constrain its origin. The predominant lithology observed in Daxiong pluton is granodiorite, in which dioritic enclaves are well developed. Zircon U-Pb dating for one granodiorite sample yields an emplacement age of 107 +/- 1 Ma. Zircon I-If isotopic analysis yields epsilon(Hf) ( t) values of - 1. 0 to + 3. 0, with two-stage model age ranging from 974 to 1226Ma. Granodiorites are silica enriched in composition ( SiO2 = 70. 65% similar to 71. 10%), with high contents of CaO ( 3. 21 % similar to 3.26%) and low contents of K2O (2.81 similar to 2.99%) and P2O5 (0.09%). Both granodiorite and dioritic enclave are medium-K calcalkaline, and exhibit similar epsilon(Nd) (t) values ( - 4. 6, and - 3. 2, respectively). Their two-stage model ages are identical, consistent with the zircon Hf isotope model age. Geochemical characteristics combined with field and petrographic observations show that the dioritic enclave can be considered as the mafic microgranular enclave. Our data indicate that an important magmatic mixing event probably occurred in middle-western Gangdese belt during the late of Early Cretaceous time.
学科主题	火成岩岩石学
WOS关键词	NORTHEAST CHINA ; MAFIC ENCLAVES ; ROCKS ; GRANITE ; DISCRIMINATION ; ORIGIN ; MANTLE
WOS研究方向	Geology
语种	中文
出版者	SCIENCE CHINA PRESS
WOS记录号	WOS:000259117600014
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/38619]
专题	中国地质调查局
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	Zhou, CY ,Zhu, DC ,Zhao, ZD ,et al. Petrogenesis of Daxiong pluton in western Gangdese, Tibet: zircon U-Pb dating and Hf isotopic constraints[J]. ACTA PETROLOGICA SINICA,2008,24(2):348-358.
APA	Zhou, CY .,Zhu, DC .,Zhao, ZD .,Xu, JF .,Wang, LQ .,...&Zhou, S .(2008).Petrogenesis of Daxiong pluton in western Gangdese, Tibet: zircon U-Pb dating and Hf isotopic constraints.ACTA PETROLOGICA SINICA,24(2),348-358.
MLA	Zhou, CY ,et al."Petrogenesis of Daxiong pluton in western Gangdese, Tibet: zircon U-Pb dating and Hf isotopic constraints".ACTA PETROLOGICA SINICA 24.2(2008):348-358.