气候变化领域集成服务门户(CCPortal): 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

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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, Jin-Xiang; Qin, Ke-Zhang; Li, Guang-Ming; Xiao, Bo; Zhao, Jun-Xing; Chen, Lei
通讯作者	Li, JX (通讯作者)
发表日期	2016
ISSN	0072-1050
EISSN	1099-1034
起始页码	285
结束页码	307
卷号	51 期号:2
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.
关键词	ORE-BEARING PORPHYRIES MAFIC ALKALINE MAGMAS COPPER-GOLD DEPOSIT SOUTHERN TIBET MO DEPOSIT LU-HF TECTONIC EVOLUTION MINERAL CHEMISTRY HIGH-TEMPERATURE VOLCANIC-ROCKS
英文关键词	ore-bearing porphyries; zircon Hf isotope; MASH; Bangongco metallogenetic belt; Tibet
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000372734100007
来源期刊	GEOLOGICAL JOURNAL
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/258749
推荐引用方式 GB/T 7714	Li, Jin-Xiang,Qin, Ke-Zhang,Li, Guang-Ming,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]. 中国科学院青藏高原研究所,2016,51(2).
APA	Li, Jin-Xiang,Qin, Ke-Zhang,Li, Guang-Ming,Xiao, Bo,Zhao, Jun-Xing,&Chen, Lei.(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).
MLA	Li, Jin-Xiang,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).