| 广西富贺钟钨锡多金属矿集区稀有气体同位素特征及其地质意义 |
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| 关键词:ore-forming fluid noble gases isotope W-Sn deposit Fuchuan-Hezhou-Zhongshan area of Guangxi |
| 基金项目:广西科技厅自然基金项目“广西富贺钟钨锡矿集区壳幔成矿作用研究”(编号: 桂科自0728024) |
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| Isotopic Characteristics of Noble Gases of the Fuchuan-Hezhou-Zhongshan W-Sn-polymetallic Ore Concentration Area in Northeastern Guangxi and Their Geological Significance |
| Located at the conjunction of Fuchuan County, Hezhong City and Zhongshan County in northeastern Guangxi, the Fuchuan-Hezhou-Zhongshan W-Sn-polymetallic ore concentration area is one of the important nonferrous metal producing areas in Guangxi. It consists of three W-Sn-polymetallic orefields (Xinlu, Shuiyanba and Sanhu) lying on the southwestern margin of the Guposhan composite granite mass. In order to study the material sources and metallogenic mechanism of W-Sn-polymetallic deposits in the Fuchuan-Hezhou-Zhongshan ore concentration area, the authors analyzed the noble gases isotopic components of fluid inclusions in pyrite from the Baimianshan Sn-Zn deposit, the Shuiyanba W-Sn deposit and the Changyingling W-Sn deposit. The results indicate that 3He/4He ratios are 0.53~4.53 Ra, 40Ar/36Ar ratios are 315.58~600.55, 38Ar/36Ar ratios are 0.18688~0.19102, 20Ne/22Ne ratios are 9.737~9.848, and 21Ne/22Ne ratios are 0.0291~0.0304. The data obtained suggests that the ore-forming fluid was mixed with meteoric water, mantle fluid and crustal fluid, and the proportion of He derived from the mantle was 8.7%~75.7%. A synthetic analysis of the dating results of the Guposhan granites and mineralization as well as the genesis of granites shows that the Fuchuan-Hezhou-Zhongshan ore concentration area experienced poly-phase crust-mantle interaction in Mesozoic, and the crust-mantle interaction underwent the evolution from high intensity through low intensity to high intensity, resulting in the magmatic emplacement of Guposhan granites (165~160 Ma) and late fine-grained granite (154~151 Ma) as well as mineralization of the W-Sn-polymetallic deposit (136~100 Ma) respectively. The metallogenic epoch was later than that of late fine-grained granite, whereas the W-Sn-polymetallic ore bodies occurred in the same place as the late fine-grained granite. |
| CAI Ming-hai,PENG Zhen-an,NAGAO Keisuke,WANG Xian-bin,GUO Teng-fei,LIU Hu.2013.Isotopic Characteristics of Noble Gases of the Fuchuan-Hezhou-Zhongshan W-Sn-polymetallic Ore Concentration Area in Northeastern Guangxi and Their Geological Significance[J].Acta Geoscientica Sinica,34(3):287-294. |
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