Petrogenesis and implication of the andesites at similar to 113Ma in the Nagqu region in the northern Lhasa subterrane

	Petrogenesis and implication of the andesites at similar to 113Ma in the Nagqu region in the northern Lhasa subterrane
	Huang Yu 1; Zhu DiCheng 1; Zhao ZhiDan 1; Zhang LiangLiang 2; DePaolo, Don 3; Hu ZhaoChu 4; Yuan HongLin 5; Mo XuanXue 1
刊名	ACTA PETROLOGICA SINICA
	2012-05-01
卷号	28 期号:5 页码:1603-1614
关键词	Ancient lithosphere mantle Early Cretaceous andesites Nagqu Amdo microcontinent Northern Lhasa subterrane
ISSN号	1000-0569
文献子类	Article
英文摘要	The nature of magma source region and petrogenesis of the Early Cretaceous igneous rocks, which are widely distributed in the northern Lhasa subterrane, are not well constrained so far largely due to the limitation of high quality geochronological and geochemical data. This paper reports the petrological, zircon U-Pb dating, whole-rock geochemical and zircon Hf isotopic data of the andesites from Nagqu area, northern Lhasa subterrane. The andesites have been dated to be 112. 7 +/- 0. 7Ma by zircon U-Pb dating method. These rocks are high-K calc-alkaline, enriched in large-ion lithophile elements (LILEs), Th, U, and light rare earth elements (LREEs), and depleted in high field strength elements (e. g., Nb, Ta, P, and Ti; HFSEs). The andesites show high (Sr-87/Sr-86) values (0. 7100 similar to 0. 7126), negative epsilon(Nd)(t) values (-10. 5 similar to -7. 8), and negative zircon epsilon(Hf)(t) values (-9. 9 similar to -4. 7), yielding ancient two-stage Nd model ages of 1. 5 similar to 1. 8Ga and zircon Hf isotope mantle model ages of 1. 0 similar to 1. 6Ga. The data reported here, combined with regional geological background of the northern Lhasa subterrane, we propose that the Nagqu andesites can be considered as the products of partial melting of ancient lithospheric mantle of the Amdo microcontinent that was modified by fluids or/and melts of the sediments, and subsequently experienced varying degrees of fractional crystallization. This magma event is most likely resulted from the slab break-off of the southward subduction of the Bangong-Nujiang Ocean seafloor.
WOS关键词	LA-ICP-MS ; IN-SITU ANALYSIS ; U-PB ISOTOPE ; HF ISOTOPES ; LU-HF ; CRETACEOUS GRANITOIDS ; TRACE-ELEMENTS ; TIBET ; ZIRCON ; CONSTRAINTS
WOS研究方向	Geology
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000304784400022
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/84374]
专题	中国科学院地质与地球物理研究所
通讯作者	Huang Yu
作者单位	1.China Univ Geosci, Sch Earth Sci & Mineral Resources, State Key Lab Geol Proc & Mineral Resources, Beijing 100083, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 3.Univ Calif Berkeley, Berkeley, CA 94720 USA 4.China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Fac Earth Sci, Wuhan 430074, Peoples R China 5.NW Univ Xian, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Peoples R China
推荐引用方式 GB/T 7714	Huang Yu,Zhu DiCheng,Zhao ZhiDan,et al. Petrogenesis and implication of the andesites at similar to 113Ma in the Nagqu region in the northern Lhasa subterrane[J]. ACTA PETROLOGICA SINICA,2012,28(5):1603-1614.
APA	Huang Yu.,Zhu DiCheng.,Zhao ZhiDan.,Zhang LiangLiang.,DePaolo, Don.,...&Mo XuanXue.(2012).Petrogenesis and implication of the andesites at similar to 113Ma in the Nagqu region in the northern Lhasa subterrane.ACTA PETROLOGICA SINICA,28(5),1603-1614.
MLA	Huang Yu,et al."Petrogenesis and implication of the andesites at similar to 113Ma in the Nagqu region in the northern Lhasa subterrane".ACTA PETROLOGICA SINICA 28.5(2012):1603-1614.