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DOI10.1016/j.jseaes.2013.03.029
Multiple mineralization events at the Jiru porphyry copper deposit, southern Tibet: Implications for Eocene and Miocene magma sources and resource potential
Zheng, Youye; Sun, Xiang; Gao, Shunbao; Zhao, Zhidan; Zhang, Gangyang; Wu, Song; You, Zhiming; Li, Jiandong
通讯作者Zheng, YY (通讯作者)
发表日期2014
ISSN1367-9120
EISSN1878-5786
起始页码842
结束页码857
卷号79
英文摘要The Jiru porphyry copper deposit in the Gangdese Porphyry Copper Belt (GPCB) is hosted by monzogranite and monzogranite porphyry with SHRIMP U-Pb ages of 48.6 +/- 0.8 Ma and 16.0 +/- 0.4 Ma, respectively. Rhenium-Os ages of molybdenite from the monzogranite and monzogranite porphyry are 44.9 +/- 2.6 Ma and 15.2 +/- 0.4 Ma, slightly younger than ages of the host rocks, respectively. These geochronological data indicate that there are two mineralization events at the Jiru deposit, in contrast to other porphyry deposits in the eastern part of the GPCB that are only Miocene in age. The Eocene monzogranite is characterized by high SiO2 (63.0-71.4%) and K2O (3.7-5.9%), enrichment in LILEs, depletion in Nb, Ta, and Ti, moderate negative Eu anomalies (delta Eu = 0.55-0.94), and relatively low Sr/Y (14-39) and (La/Yb) (9-20) ratios. It also has young epsilon(Nd)(t) values (-0.43 to -0.25), low initial Sr-87/Sr-86 ratios (0.7044-0.7048), and young depleted-mantle model ages T-DM (742-821 Ma), compared to Eocene melts derived from mature continental crust in the central Lhasa subterrane. These geochemical features suggest that the Jiru monzogranite was most likely derived from the hydrated asthenospheric mantle wedge with involvement of subducted sediments related to the Neo-Tethyan oceanic slab breakoff. The Miocene monzogranite porphyry contains hydrous phenocryst phases (hornblende and biotite) and displays LREE-enrichment patterns, with high Sr/Y (131-183) and (La/Yb)(n) (22-72) ratios, and weak or absent Eu anomalies. The porphyry has slightly negative epsilon(Nd)(t) values (-3.8 to -3.5), low initial Sr-87/Sr-86 ratios (0.7057-0.7058), and young T-DM (952-974 Ma). The Miocene porphyry is likely the product of remelting of the stalled Neo-Tethyan oceanic slab, with input from the lower crust during the convective removal of thickened lithosphere below southern Tibet. Recognition of the Eocene magmatic-hydrothermal ore-forming event indicates a newly recognized potential for copper resources of that age in the eastern GPCB. (C) 2013 Elsevier Ltd. All rights reserved.
关键词SR-ND-PBRE-OS AGESCONTINENTAL COLLISION ZONESHF ISOTOPIC CONSTRAINTSZIRCON U-PBCU-AUSLAB BREAKOFFULTRAPOTASSIC MAGMATISMGEOCHEMICAL CONSTRAINTSLITHOSPHERIC MANTLE
英文关键词Porphyry copper deposit; Miocene; Eocene; Petrogenesis; Gangdese; Tibet
语种英语
WOS研究方向Geology
WOS类目Geosciences, Multidisciplinary
WOS记录号WOS:000330605000018
来源期刊JOURNAL OF ASIAN EARTH SCIENCES
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/258305
推荐引用方式
GB/T 7714
Zheng, Youye,Sun, Xiang,Gao, Shunbao,et al. Multiple mineralization events at the Jiru porphyry copper deposit, southern Tibet: Implications for Eocene and Miocene magma sources and resource potential[J]. 中国科学院青藏高原研究所,2014,79.
APA Zheng, Youye.,Sun, Xiang.,Gao, Shunbao.,Zhao, Zhidan.,Zhang, Gangyang.,...&Li, Jiandong.(2014).Multiple mineralization events at the Jiru porphyry copper deposit, southern Tibet: Implications for Eocene and Miocene magma sources and resource potential.JOURNAL OF ASIAN EARTH SCIENCES,79.
MLA Zheng, Youye,et al."Multiple mineralization events at the Jiru porphyry copper deposit, southern Tibet: Implications for Eocene and Miocene magma sources and resource potential".JOURNAL OF ASIAN EARTH SCIENCES 79(2014).
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