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Petrogenesis and Metallogenic Implications of Neoproterozoic Granodiorite in the Super-Large Shimensi Tungsten-Copper Deposit in Northern Jiangxi, South China
Wenfeng Wei; Chunkit Lai; Bing Yan; Xiaoxi Zhu; Shengqiong Song; Lei Liu
2018
发表期刊Minerals
卷号8期号:10页码:1-22
摘要

The newly discovered Shimensi deposit is a super-large tungsten-copper (W-Cu) deposit with a metal reserve of 742.55 thousand tonnes (kt) W and 403.6 kt Cu. The orebodies are hosted in Mesozoic granites, which intruded the poorly documented Shimensi granodiorite belonging to the Jiuling batholith, the largest intrusion (outcrop > 2500 km(2)) in South China. Our new SHRIMP (Sensitive High Resolution Ion MicroProbe) zircon dating revealed that the granodiorite at Shimensi (ca. 830-827 Ma) was formed coeval (within analytical uncertainty) or slightly earlier than those in many other places (ca. 819-807 Ma) of the Jiuling batholith. The Neoproterozoic Shimensi granodiorite is peraluminous and high-K calc-alkaline, and contains low P content with no S-type trend (positive P2O5 vs. SiO2 correlation) displayed, thus best classified as peraluminous I-type. The I-type classification is also supported by the zircon REE patterns, largely (93%) positive epsilon Hf(t) (-0.87 to 6.60) and relatively low delta O-18 (5.8-7.7 parts per thousand). The Neoproterozoic Shimensi granodiorite was formed after the continental arc magmatism (ca. 845-835 Ma), but before the post-collisional S-type granite emplacement (ca. 825-815 Ma) in the Jiangnan Orogen. Therefore, we propose that the Shimensi granodiorite was formed in a collisional/early post-collisional setting. The delta O-18 increase from the Shimensi granodiorite to many younger (ca. 819-807 Ma) granodiorites (6.0-8.5 parts per thousand) in the Jiuling batholith probably reflects an increase of supracrustal rock-derived melts with the progress of collision. The Shimensi granodiorite contains low zircon Ce4+/Ce3+ and Eu/Eu*, suggesting a relatively reducing magma that does not favor porphyry Cu-Au mineralization. This left a high background Cu concentration (avg. 196 ppm) in the Neoproterozoic granodiorite, which may have contributed to the Mesozoic W-Cu mineralization, when the granodiorite is intruded and assimilated by the Mesozoic granites.

关键词Shimensi W–cu Deposit Neoproterozoic Granitoids Zircon Age And Hf–o Isotopes Granite Petrogenesis Jiangnan Orogen (South China)
收录类别SCI
语种英语
文献类型期刊论文
条目标识符http://ir.gyig.ac.cn/handle/42920512-1/8909
专题矿床地球化学国家重点实验室
作者单位1.Institute of Earth Sciences, Chengdu University of Technology, Chengdu 610059, China
2.State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
3.Centre of Excellence in Ore Deposits (CODES), University of Tasmania, Tasmania 7001, Australia
4.Faculty of Science, Universiti Brunei Darussalam, Gadong BE1410, Brunei
5.Guizhou Land Survey & Plan Institute, Guiyang 550005, China
推荐引用方式
GB/T 7714
Wenfeng Wei,Chunkit Lai,Bing Yan,et al. Petrogenesis and Metallogenic Implications of Neoproterozoic Granodiorite in the Super-Large Shimensi Tungsten-Copper Deposit in Northern Jiangxi, South China[J]. Minerals,2018,8(10):1-22.
APA Wenfeng Wei,Chunkit Lai,Bing Yan,Xiaoxi Zhu,Shengqiong Song,&Lei Liu.(2018).Petrogenesis and Metallogenic Implications of Neoproterozoic Granodiorite in the Super-Large Shimensi Tungsten-Copper Deposit in Northern Jiangxi, South China.Minerals,8(10),1-22.
MLA Wenfeng Wei,et al."Petrogenesis and Metallogenic Implications of Neoproterozoic Granodiorite in the Super-Large Shimensi Tungsten-Copper Deposit in Northern Jiangxi, South China".Minerals 8.10(2018):1-22.
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