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Petrogenesis of ore-forming granites with implications for W-mineralization in the super-large Shimensi tungsten-dominated polymetallic deposit in northern Jiangxi Province, South China
Wen-Feng Wei; Neng-Ping Shen; Bing Yan; Chun-Kit Lai; Jie-Hua Yang; Wei Gao; Feng Liang
2018
Source PublicationOre Geology Reviews
Volume95Pages:1123-1139
Abstract

The Shimensi deposit is a newly discovered, super-large tungsten (W) polymetallic deposit in northwestern Jiangxi Province, South China. In this paper, we reported new zircon U-Pb ages for the ore-bearing porphyritic biotite granite (151.3 +/- 2.8 Ma) and fine-grained granite (150.1 +/- 1.2 Ma and 150.7 +/- 2.4 Ma), which represent the oldest Mesozoic granitic magmatism reported at Shimensi. Our ore-bearing granite porphyry ages (142.7 +/- 2.3 Ma and 143.3 +/- 1.5 Ma) have better constrained the timing of the Jurassic-Early Cretaceous ore-forming magmatism. Geochemically, the Shimensi granitoids are strongly peraluminous, with high contents of SiO2 (70.7-78.7 wt%) and K2O (> 4.0 wt%), P2O5, Rb, Ta and U, and low contents of Ti, Sr, Ba and HREEs. The rocks also show positive P2O5 vs. SiO2 correlation, suggesting a highly-fractionated S-type affinity. Different from most W-bearing granites in the Jiangxi region, the calculated zircon epsilon Hf(t) (-10.0 to -2.4; two-stage model ages: 1350-1824 Ma) and delta O-18(zircon) values (+ 6.40 to + 8.87 parts per thousand) of the Shimensi granites suggest that the latter were mainly derived from the partial melting of heterogeneous source rocks, probably with combined contributions from the Neoproterozoic Shuangqiaoshan Group metamorphic rocks and Jiuling granodiorite. The calculated zircon Eu/Eu* (0.05-0.58; mean = 0.20) and Ce4+/Ce3+ (3.83-96.49; mean = 20.99) ratios of the granites indicate very low oxygen fugacity (fO(2)) for the ore-forming magmas, a highly favorable factor for W mineralization. Potentially W and Cu-rich source rocks, and highly-fractionated and reducing granitic magmas, were important factors that triggered super-large W mineralization at Shimensi.

KeywordShimensi w Deposit zircon U-pb Dating zircon Geochemistry And Hf-o Isotopes granite Petrogenesis And Mineralization south China
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/8783
Collection矿床地球化学国家重点实验室
Affiliation1.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.Faculty of Science, Universiti Brunei Darussalam, Gadong BE1410, Brunei Darussalam
4.ARC Centre of Excellence in Ore Deposits (CODES), University of Tasmania, Hobart, Tasmania 7001, Australia
Recommended Citation
GB/T 7714
Wen-Feng Wei,Neng-Ping Shen,Bing Yan,et al. Petrogenesis of ore-forming granites with implications for W-mineralization in the super-large Shimensi tungsten-dominated polymetallic deposit in northern Jiangxi Province, South China[J]. Ore Geology Reviews,2018,95:1123-1139.
APA Wen-Feng Wei.,Neng-Ping Shen.,Bing Yan.,Chun-Kit Lai.,Jie-Hua Yang.,...&Feng Liang.(2018).Petrogenesis of ore-forming granites with implications for W-mineralization in the super-large Shimensi tungsten-dominated polymetallic deposit in northern Jiangxi Province, South China.Ore Geology Reviews,95,1123-1139.
MLA Wen-Feng Wei,et al."Petrogenesis of ore-forming granites with implications for W-mineralization in the super-large Shimensi tungsten-dominated polymetallic deposit in northern Jiangxi Province, South China".Ore Geology Reviews 95(2018):1123-1139.
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