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Petrogenesis of ore-bearing porphyries from the Duolong porphyry Cu-Au deposit, central Tibet: Evidence from U-Pb geochronology, petrochemistry and Sr-Nd-Hf-O isotope characteristics

文献类型：期刊论文

作者Li, Jin-Xiang1; Qin, Ke-Zhang2; Li, Guang-Ming2; Xiao, Bo2,3; Zhao, Jun-Xing2; Cao, Ming-Jian2; Chen, Lei4
刊名LITHOS
出版日期2013-02-01
卷号160页码:216-227
关键词Duolong Porphyry Cu-au Deposit Zircon Hf-o Isotope Petrogenesis Tibet
ISSN号0024-4937
DOI10.1016/j.lithos.2012.12.015
文献子类Article
英文摘要The Duolong porphyry Cu-Au deposit (5.4 Mt at 0.72% Cu, 41 t at 0.23 g/t Au), which is related to the granodiorite porphyry and the quartz-diorite porphyry from the Bangongco copper belt in central Tibet, formed in a continental arc setting. Here, we present the zircon U-Pb ages, geochemical whole-rock, Sr-Nd whole-rock and zircon in-situ Hf-O isotopic data for the Duolong porphyries. Secondary ion mass spectrometry (SIMS) zircon U-Pb analyses for six samples yielded consistent ages of similar to 118 Ma, indicating a Cretaceous formation age. The Duolong porphyries (SiO2 of 58.81-68.81 wt.%, K2O of 2.90-5.17 wt%) belong to the high-K calc-alkaline series. They show light rare earth element (LREE)-enriched distribution patterns with (La/Yb)(N) = 6.1-11.7, enrichment in large ion lithophile elements (e.g., Cs, Rb, and Ba) and depletion of high field strength elements (e.g., Nb), with negative Ti anomalies. All zircons from the Duolong porphyries share relatively similar Hf-O isotopic compositions (delta O-18 = 5.88-727%.; epsilon Hf(t) =3.6-7.3), indicating that they crystallized from a series of cogenetic melts with various degrees of fractional crystallization. This, along with the general absence of older inherited zircons, rules out significant crustal contamination during zircon growth. The zircons are mostly enriched in delta O-18 relative to mantle values, indicating the involvement of an O-18-enriched crustal source in the generation of the Duolong porphyries. Together with the presence of syn-mineralization basaltic andesite, the mixing between silicic melts derived from the lower crust and evolved H2O-rich mafic melts derived from the metasomatized mantle wedge, followed by subsequent fractional crystallization (FC) and minor crustal contamination in the shallow crust, could well explain the petrogenesis of the Duolong porphyries. Significantly, the hybrid melts possibly inherited the arc magma characteristics of abundant F, Cl, Cu, and Au elements and high oxidation state, which contributed to the formation of the Duolong porphyry Cu-Au deposit. (C) 2013 Elsevier B.V. All rights reserved.
WOS关键词MAGMATIC-HYDROTHERMAL EVOLUTION ; ZIRCON REFERENCE MATERIAL ; PAPUA-NEW-GUINEA ; COPPER-DEPOSIT ; LOWER CRUST ; SOUTHERN TIBET ; TRACE-ELEMENT ; ARC MAGMAS ; LU-HF ; FRACTIONAL CRYSTALLIZATION
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
WOS记录号WOS:000316035600013
出版者ELSEVIER SCIENCE BV
资助机构Ministry of Science and Technology of China (973 Project)(2011CB403100) ; Ministry of Science and Technology of China (973 Project)(2011CB403100) ; Tibetan large deposit metallogenic specialization(1212011221073) ; Tibetan large deposit metallogenic specialization(1212011221073) ; Natural Science Foundation Project(41072059 ; Natural Science Foundation Project(41072059 ; 40902027) ; 40902027) ; Ministry of Science and Technology of China (973 Project)(2011CB403100) ; Ministry of Science and Technology of China (973 Project)(2011CB403100) ; Tibetan large deposit metallogenic specialization(1212011221073) ; Tibetan large deposit metallogenic specialization(1212011221073) ; Natural Science Foundation Project(41072059 ; Natural Science Foundation Project(41072059 ; 40902027) ; 40902027) ; Ministry of Science and Technology of China (973 Project)(2011CB403100) ; Ministry of Science and Technology of China (973 Project)(2011CB403100) ; Tibetan large deposit metallogenic specialization(1212011221073) ; Tibetan large deposit metallogenic specialization(1212011221073) ; Natural Science Foundation Project(41072059 ; Natural Science Foundation Project(41072059 ; 40902027) ; 40902027) ; Ministry of Science and Technology of China (973 Project)(2011CB403100) ; Ministry of Science and Technology of China (973 Project)(2011CB403100) ; Tibetan large deposit metallogenic specialization(1212011221073) ; Tibetan large deposit metallogenic specialization(1212011221073) ; Natural Science Foundation Project(41072059 ; Natural Science Foundation Project(41072059 ; 40902027) ; 40902027)
源URL[http://ir.iggcas.ac.cn/handle/132A11/86533]  
专题中国科学院地质与地球物理研究所
通讯作者Li, Jin-Xiang
作者单位1.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Continental Collis & Plateau Uplift, Beijing 100085, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
3.China Nonferrous Met Min Grp Co Ltd, Beijing 100029, Peoples R China
4.Chinese Acad Geol Sci, Inst Mineral Resources, MRL Key Lab Metallogeny & Mineral Assessment, Beijing 100037, Peoples R China
推荐引用方式
GB/T 7714		 Li, Jin-Xiang,Qin, Ke-Zhang,Li, Guang-Ming,et al. Petrogenesis of ore-bearing porphyries from the Duolong porphyry Cu-Au deposit, central Tibet: Evidence from U-Pb geochronology, petrochemistry and Sr-Nd-Hf-O isotope characteristics[J]. LITHOS,2013,160:216-227.
APA Li, Jin-Xiang.,Qin, Ke-Zhang.,Li, Guang-Ming.,Xiao, Bo.,Zhao, Jun-Xing.,...&Chen, Lei.(2013).Petrogenesis of ore-bearing porphyries from the Duolong porphyry Cu-Au deposit, central Tibet: Evidence from U-Pb geochronology, petrochemistry and Sr-Nd-Hf-O isotope characteristics.LITHOS,160,216-227.
MLA Li, Jin-Xiang,et al."Petrogenesis of ore-bearing porphyries from the Duolong porphyry Cu-Au deposit, central Tibet: Evidence from U-Pb geochronology, petrochemistry and Sr-Nd-Hf-O isotope characteristics".LITHOS 160(2013):216-227.

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来源：地质与地球物理研究所

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