Petrogenesis of Cretaceous igneous rocks from the Duolong porphyry Cu-Au deposit, central Tibet: evidence from zircon U-Pb geochronology, petrochemistry and Sr-Nd-Pb-Hf isotope characteristics

doi:10.1002/gj.2631

	Petrogenesis of Cretaceous igneous rocks from the Duolong porphyry Cu-Au deposit, central Tibet: evidence from zircon U-Pb geochronology, petrochemistry and Sr-Nd-Pb-Hf isotope characteristics
	Li, JX (Li, Jin-Xiang)3,4; Li, JX ; Chen, L (Chen, Lei)2,5; Zhao, JX (Zhao, Jun-Xing)5; Xiao, B (Xiao, Bo)1,5; Li, GM (Li, Guang-Ming)5; Qin, KZ (Qin, Ke-Zhang)5
刊名	GEOLOGICAL JOURNAL
	2016
卷号	51 期号:2 页码:285-307
关键词	Ore-bearing Porphyries Mafic Alkaline Magmas Copper-gold Deposit Southern Tibet Northern Tibet Arc Magmas Lu-hf Volcanic-rocks Eastern Tibet Mo Deposit
DOI	10.1002/gj.2631
文献子类	Article
英文摘要	The Duolong porphyry Cu-Au deposit (5.4Mt at 0.72% Cu, 41t at 0.23g/t Au) was recently discovered in the southern Qiangtang terrane, central Tibet. Here, new whole-rock elemental and Sr-Nd-Pb isotope and zircon Hf isotopic data of syn- and post-ore volcanic rocks and barren and ore-bearing granodiorite porphyries are presented for a reconstruction of magmas associated with Cu-Au mineralization. LA-ICP-MS zircon U-Pb dating yields mean ages of 117.0 +/- 2.0 and 120.9 +/- 1.7Ma for ore-bearing granodiorite porphyry and 105.2 +/- 1.3Ma for post-ore basaltic andesite. All the samples show high-K calc-alkaline compositions, with enrichment of light rare earth elements (LREE) and large ion lithophile elements (LILE: Cs and Rb) and depletion of high field strength elements (HFSE: Nb and Ti), consistent with the geochemical characteristics of arc-type magmas. Syn- and post-ore volcanic rocks show initial Sr ratios of 0.7045-0.7055, epsilon(Nd)(t) values of -0.8 to 3.6, (Pb-206/Pb-204)(t) ratios of 18.408-18.642, (Pb-207/Pb-204)(t) of 15.584-15.672 and positive zircon epsilon(Hf)(t) values of 1.3-10.5, likely suggesting they dominantly were derived from metasomatized mantle wedge and contaminated by southern Qiangtang crust. Compared to mafic volcanic rocks, barren and ore-bearing granodiorite porphyries have relatively high initial Sr isotopic ratios (0.7054-0.7072), low epsilon(Nd)(t) values (-1.7 to -4.0), similar Pb and enriched zircon Hf isotopic compositions [epsilon(Hf)(t) of 1.5-9.7], possibly suggesting more contribution from southern Qiangtang crust. Duolong volcanic rocks and granodiorite porphyries likely formed in a continental arc setting during northward subduction of the Bangong-Nujiang ocean and evolved at the base of the lower crust by MASH (melting, assimilation, storage and homogenization) processes. Copyright (c) 2014 John Wiley & Sons, Ltd.
学科主题	地质学
语种	英语
WOS记录号	WOS:000372734100007
内容类型	期刊论文
源URL	[http://ir.itpcas.ac.cn/handle/131C11/7747]
专题	青藏高原研究所_图书馆
通讯作者	Li, JX
作者单位	1.China Nonferrous Met Min Grp Co Ltd, Beijing, Peoples R China 2.Chinese Acad Geol Sci, Inst Mineral Resources, MRL Key Lab Metallogeny & Mineral Assessment, Beijing, Peoples R China 3.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Continental Collis & Plateau Uplift, Bldg 3,Courtyard 16,Lin Cui Rd, Beijing 100101, Peoples R China 4.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing, Peoples R China 5.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100101, Peoples R China
推荐引用方式 GB/T 7714	Li, JX ,Li, JX,Chen, L ,et al. Petrogenesis of Cretaceous igneous rocks from the Duolong porphyry Cu-Au deposit, central Tibet: evidence from zircon U-Pb geochronology, petrochemistry and Sr-Nd-Pb-Hf isotope characteristics[J]. GEOLOGICAL JOURNAL,2016,51(2):285-307.
APA	Li, JX .,Li, JX.,Chen, L .,Zhao, JX .,Xiao, B .,...&Qin, KZ .(2016).Petrogenesis of Cretaceous igneous rocks from the Duolong porphyry Cu-Au deposit, central Tibet: evidence from zircon U-Pb geochronology, petrochemistry and Sr-Nd-Pb-Hf isotope characteristics.GEOLOGICAL JOURNAL,51(2),285-307.
MLA	Li, JX ,et al."Petrogenesis of Cretaceous igneous rocks from the Duolong porphyry Cu-Au deposit, central Tibet: evidence from zircon U-Pb geochronology, petrochemistry and Sr-Nd-Pb-Hf isotope characteristics".GEOLOGICAL JOURNAL 51.2(2016):285-307.