Zircon U-Pb age and Sr-Nd-Hf isotope geochemistry of the Panzhihua A-type syenitic intrusion in the Emeishan large igneous province, southwest China and implications for growth of juvenile crust

doi:10.1016/j.lithos.2008.12.006

	Zircon U-Pb age and Sr-Nd-Hf isotope geochemistry of the Panzhihua A-type syenitic intrusion in the Emeishan large igneous province, southwest China and implications for growth of juvenile crust
	Zhong, Hong 1; Zhu, Wei-Guang 1; Hu, Rui-Zhong 1; Xie, Lie-Wen 2; He, De-Feng 1; Liu, Feng 3; Chu, Zhu-Yin 2
刊名	LITHOS
	2009-06-01
卷号	110 期号:1-4 页码:109-128
关键词	A-type syenitic intrusion Zircon U-Pb dating Sr-Nd-Hf isotope Petrogenesis Emeishan large igneous province
ISSN号	0024-4937
DOI	10.1016/j.lithos.2008.12.006
文献子类	Review
英文摘要	The late Permian Panzhihua syenitic stock in the Pan-Xi area, SW China, showing the typical association of mantle-derived mafic and alkaline rocks along with silicic units, is genetically related to the upwelling Emeishan plume head. This syenitic intrusion consists mainly of metaluminous syenite, metaluminous to peralkaline quartz syenite with subordinate syenite porphyry and alkali-feldspar granite. SHRIMP U-Pb zircon analysis reveal that the Panzhihua syenitic pluton was emplaced at 253.1 +/- 1.9 Ma, and is slightly younger than the crystallization age of the spatially associated gabbroic intrusion. These syenitic and granitic rocks have a distinctive A-type chemistry characterized by elevated high-field-strength elements (HFSE) contents and high Ga/Al ratios (3.95 to 6.79). Nb/Ta and Zr/Hf ratios of the syenitic and granitic rocks, gabbros and syenodiorites are similar to those typical of oceanic island basalt (OIB). These granitoids all have relatively low initial Sr-87/Sr-86 ratios (0.7037-0.7058), positive epsilon(Nd)(t) values (+ 2.4 to + 3.5). The magmatic zircons from the syenites exhibit Positive epsilon(Hf)(t) values between 5.9 and 10.4, which correspond to single-stage depleted mantle Hf model ages (T-DM1) of 494 to 671 Ma. In contrast, the magmatic zircons from the syenite porphyries are characterized by positive epsilon(Hf)(t) values of 11.4 to 12.9 with younger Tom, model ages of 382 to 449 Ma than those of the syenites. The positive epsilon(Nd)(t) and epsilon(Hf)(t) values of the Panzhihua syenitic intrusion indicate a significant contribution of plume-derived basaltic underplating to magma genesis. The similarity of the Nd isotopic compositions of the syenitic and granitic rocks, gabbros and syenodiorites suggests that their parental magmas were derived from a common reservoir. We propose that the Panzhihua syenitic intrusion was predominantly generated by the emplacement of two distinct syenitic melts from differentiation of newly underplated, mildly alkaline basaltic magmas ponded at depth, with incorporation of little Neoproterozoic lower crustal melts, and Subsequent fractional crystallization of individual melts. It is therefore demonstrated that the growth of juvenile crust through mantle-derived underplating during the late Permian was significant in the inner zone of the Emeishan large igneous province. (C) 2008 Elsevier B.V. All rights reserved,
WOS关键词	PAN-XI AREA ; PLUME-LITHOSPHERE INTERACTION ; LARAMIE ANORTHOSITE COMPLEX ; NORTHERN SHERMAN BATHOLITH ; PERMIAN-TRIASSIC BOUNDARY ; HONGGE LAYERED INTRUSION ; BIMODAL VOLCANIC-ROCKS ; FLOOD-BASALT PROVINCE ; SW CHINA ; TRACE-ELEMENT
WOS研究方向	Geochemistry & Geophysics ; Mineralogy
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000266541500008
资助机构	National Key Basic Research Program of China(2007CB411401) ; National Key Basic Research Program of China(2007CB411401) ; Chinese Academy of Sciences(KZCX2-YW-111-02) ; Chinese Academy of Sciences(KZCX2-YW-111-02) ; National Natural Science Foundation of China(40673030 ; National Natural Science Foundation of China(40673030 ; 40473025 ; 40473025 ; 40673031) ; 40673031) ; National Key Basic Research Program of China(2007CB411401) ; National Key Basic Research Program of China(2007CB411401) ; Chinese Academy of Sciences(KZCX2-YW-111-02) ; Chinese Academy of Sciences(KZCX2-YW-111-02) ; National Natural Science Foundation of China(40673030 ; National Natural Science Foundation of China(40673030 ; 40473025 ; 40473025 ; 40673031) ; 40673031) ; National Key Basic Research Program of China(2007CB411401) ; National Key Basic Research Program of China(2007CB411401) ; Chinese Academy of Sciences(KZCX2-YW-111-02) ; Chinese Academy of Sciences(KZCX2-YW-111-02) ; National Natural Science Foundation of China(40673030 ; National Natural Science Foundation of China(40673030 ; 40473025 ; 40473025 ; 40673031) ; 40673031) ; National Key Basic Research Program of China(2007CB411401) ; National Key Basic Research Program of China(2007CB411401) ; Chinese Academy of Sciences(KZCX2-YW-111-02) ; Chinese Academy of Sciences(KZCX2-YW-111-02) ; National Natural Science Foundation of China(40673030 ; National Natural Science Foundation of China(40673030 ; 40473025 ; 40473025 ; 40673031) ; 40673031)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/71164]
专题	中国科学院地质与地球物理研究所
通讯作者	Zhong, Hong
作者单位	1.Chinese Acad Sci, Inst Geochem, State Key Lab Ore Deposit Geochem, Guiyang 550002, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 3.Chengdu Univ Technol, Chengdu 610059, Peoples R China
推荐引用方式 GB/T 7714	Zhong, Hong,Zhu, Wei-Guang,Hu, Rui-Zhong,et al. Zircon U-Pb age and Sr-Nd-Hf isotope geochemistry of the Panzhihua A-type syenitic intrusion in the Emeishan large igneous province, southwest China and implications for growth of juvenile crust[J]. LITHOS,2009,110(1-4):109-128.
APA	Zhong, Hong.,Zhu, Wei-Guang.,Hu, Rui-Zhong.,Xie, Lie-Wen.,He, De-Feng.,...&Chu, Zhu-Yin.(2009).Zircon U-Pb age and Sr-Nd-Hf isotope geochemistry of the Panzhihua A-type syenitic intrusion in the Emeishan large igneous province, southwest China and implications for growth of juvenile crust.LITHOS,110(1-4),109-128.
MLA	Zhong, Hong,et al."Zircon U-Pb age and Sr-Nd-Hf isotope geochemistry of the Panzhihua A-type syenitic intrusion in the Emeishan large igneous province, southwest China and implications for growth of juvenile crust".LITHOS 110.1-4(2009):109-128.