Isotopic Characteristics of Noble Gases of the Fuchuan-Hezhou-Zhongshan W-Sn-Polymetallic Ore Concentration Area in Northeastern Guangxi and Their Geological Significance
详细信息
- 责任者：Cai Minghai (College of Resources and Metallurgy ; Guangxi University ; Nanning 530004 ; China) ; Peng Zhenan
- 刊名：Acta Geoscientica Sinica
- 出版年：2013
- 卷期：14(3)
- 关键词：钨矿 ; tungsten ores ; 锡矿 ; tin ores ; 广西 ; Guangxi Province
- 页码：p.287-294
- 图表：illus., 2 tables, 29 refs.
- 分类号：1001
- issnNo：ISSN1006-3021
- isbnNo：CN11-3474/P
摘要
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 3 He/ 4 He ratios are 0.53～4.53 Ra, 40 Ar/ 36 Ar ratios are 315.58～600.55, 38 Ar/ 36 Ar ratios are 0.18688～0.19102, 20 Ne/ 22 Ne ratios are 9.737～9.848, and 21 Ne/ 22 Ne ratios are 0.0291～0.0304. The data obtainedsuggests 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.
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