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 | |
Li, Jin-Xiang1; Qin, Ke-Zhang2; Li, Guang-Ming2; Xiao, Bo2,3; Zhao, Jun-Xing2; Cao, Ming-Jian2; Chen, Lei4 | |
刊名 | LITHOS
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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 |
DOI | 10.1016/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 |
出版者 | ELSEVIER SCIENCE BV |
WOS记录号 | WOS:000316035600013 |
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) |
内容类型 | 期刊论文 |
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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