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学科主题: 地球科学::地质学
题名: 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
作者: Li, JX (Li, Jin-Xiang)1, 2; Qin, KZ (Qin, Ke-Zhang)3; Li, GM (Li, Guang-Ming)3; Xiao, B (Xiao, Bo)3, 4; Zhao, JX (Zhao, Jun-Xing)3; Chen, L (Chen, Lei)3, 5
通讯作者: Li, JX
刊名: GEOLOGICAL JOURNAL
发表日期: 2016
DOI: 10.1002/gj.2631
卷: 51, 期:2, 页:285-307
收录类别: SCI
合作性质: 国内
文章类型: 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.
语种: 英语
WOS记录号: WOS:000372734100007
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.itpcas.ac.cn/handle/131C11/7747
Appears in Collections:图书馆_期刊论文

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作者单位: 1.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
2.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100101, Peoples R China
4.China Nonferrous Met Min Grp Co Ltd, Beijing, Peoples R China
5.Chinese Acad Geol Sci, Inst Mineral Resources, MRL Key Lab Metallogeny & Mineral Assessment, Beijing, Peoples R China

Recommended Citation:
Li, JX ,Qin, KZ ,Li, GM ,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.
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文件名: V.51(2) 285-307 2016.pdf
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