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- W2360265392 abstract "Yongping deposit is a large copper deposit located in the Qiantangjiang-Xinjiang intracontinental rift basin.The magmatic rocks in this deposit include porphyric biotite granite body and quartz porphyry dykes.Within and around the biotite granite body occurred porphyry-type and skarn-type Cu-Mo-W polymetallic mineralization.Biotite analysis by electron microprobe reveals that the biotites in the porphyric biotite granite are characteristic with high-Mg,low-Fe,and high-Ti,with Fe/(Fe+Mg)ratios of 0.21～0.33 and TiO_2 contents of 2.12%～4.28%.The biotites in the quartz porphyry contain even higher Mg with Fe/(Fe+Mg)ratios of 0.10 ～0.15 and similar TiO_2 contents(2.43%～3.86%).The biotite chemistry suggests a very high oxygen fugacity for the granitic magma,which is similar to those copper mineralization related granites in the Middle-Lower Yangtze regions.Various degrees of hydrothermal alteration took place in the Yongping granites,which caused biotite altered into chlorite.The chlorites from the quartz porphyry show Fe-rich,Mg-poor,Ti-poor features,with Fe/(Fe+Mg)ratios of 0.72～0.76 and TiO_2 contents of 0.02%～0.06%, and the calculated temperatures are between 139℃ and 224℃.In contrast,the chlorites from the porphyric biotite granite show lower Fe/(Fe+Mg)ratio(0.36～0.44)and higher TiO_2 contents(0.05%～0.36%),and the formation temperatures are higher from 229℃ to 346℃,which are in the same range as those mineralization temperatures(220～400℃)deduced from fluid inclusion study. A systematic Sr-Nd-Hf isotope study indicates that the porphyric biotite granite has a wider range and higher e_(Hf)(t)and e_(Nd)(t)values of-0.1～-10.3 and-5.83～-7.95,respectively,which suggest a crust-mantle mixing characteristic for the petrogenesis. The quartz porphyry show lower e_(Hf)(t)and e_(Nd)(t)values of-8.4～-12.5 and-9.93～-10.2,respectively,suggesting little or less contribution from the mantle source.Overall,the granitic rocks at Yongping are mainly products of remelting of basement rocks of Middle Proterozoic age in the area,with small but variable amounts of mantle contributions." @default.
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- W2360265392 date "2008-01-01" @default.
- W2360265392 modified "2023-09-23" @default.
- W2360265392 title "Hydrothermal alteration and petrogenesis of granites in the Yongping copper deposit,Jiangxi Province:Constraints from mineral chemistry,element geochemistry,and Sr-Nd-Hf isotopes" @default.
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