| 黔东早寒武世早期重晶石富集机制研究——来自硫同位素的约束 |
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| 关键词:Guizhou Tianzhu barite ore-controlling factors sulfur isotope |
| 基金项目:国家自然科学基金委-贵州省联合基金项目(编号: U1812402);国家自然科学基金项目(编号: 41763006) |
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| 摘要: |
| A Study of the Enrichment Mechanism of Early Cambrian Barite in Eastern Guizhou: Constraint from Sulfur Isotope |
| The barite deposits formed in Early Cambrian are mainly distributed in the north (Qinling–Dabashan area) and southeast (Hunan–Guizhou border area) margin of the Yangtze platform in China. Distributed in the east of Guizhou Province, the barite deposits of Dahebian and Tianzhu have reached more than 200 million tons, which constitute a rare superlarge barite orefield both in China and in the world. The Yundong barite deposit in the same horizon has also been found in the northwest wing of the Dahebian barite deposit in recent years, but there are significant differences between them in metallogenic characteristics. In this paper, the authors compared the Yundong barite deposit with the Dahebian barite deposit by the correlation work of ore-bearing rock series, sedimentary facies and geochemical characteristics. The results show that the difference of ore-bearing potential is affected by the degree of hypoxia and the intensity of hot water action. Based on the characteristics of organic matter and sulfur isotopes, this paper discusses the metallogenic mechanism of barite deposits in Tianzhu area. SO2– 4 in the deposit was derived from seawater sulfate and Ba2+ came from seawater and submarine hydrothermal solution. Compared with the Yundong barite deposit, the Dahebian barite deposit is characterized by shallower water level, higher oxygen fugacity, weaker sulfate reduction and higher residual sulfate concentration. As a result, the Yundong barite deposit shows the characteristics of poor metallogeny compared with the Dabian barite deposit. |
| WANG Fu-liang,HUANG Yi,FU Yong,LONG Ke-shu,WEN Xing-qiao.2020.A Study of the Enrichment Mechanism of Early Cambrian Barite in Eastern Guizhou: Constraint from Sulfur Isotope[J].Acta Geoscientica Sinica,41(5):686-698. |
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