Climate Change Data Portal
DOI | 10.1016/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 |
ISSN | 1367-9120 |
EISSN | 1878-5786 |
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). |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。