| 内蒙古炭窑口硫化物矿床Fe、S同位素组成及对硫化物成矿的制约 |
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| 关键词:Langshan ore belt Tanyaokou Fe isotope S isotope diagenetic replacement genetic model |
| 基金项目:国家重点研发计划项目(编号: 2019YFA0708400);国家自然科学基金项目(编号: 41803025; 41873027);中国地质科学院基本科研业务费专项经费(编号: J2012);自然资源部深地动力学重点实验室自主研究课题(编号: J1901-20-1) |
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| 摘要: |
| Fe-S Isotope Compositions of the Tanyaokou Sulfide Deposit in Inner Mongolia and Their Constraints on Sulfide Formations |
| Mid–Proterozoic massive sulfides represent the most important Zn metallogenic event in geologic history and are characterized by common occurrence of 34S enrichments. Significantly, several giant Zn-Pb deposits in the Langshan polymetallic ore district of Inner Mongolia, especially the Tanyaokou and adjacent Dongshengmiao deposits seem to be the most heavy sulfide ore deposits in the world. Detailed Fe-S isotope analyses of the Tanyaokou deposit have demonstrated that the origin of disseminated pyrite and the generally high δ34S values represent closed-system pyrite production in sediment porewater, whereas roughly negative δ56Fe values represent diagenetic conversion of ferric (oxyhydr) oxides, which were totally oxidized by the Fe2+ in the seawater. Given that there is a 13C-depletion anomaly in the carbonate associated with sulfide mineralization, strong TSR, or SR-AOM involving organic matter in closed-system conditions in the sediment pile, together with basin restriction, provides a plausible explanation for the world’s most heavy ore sulfur. Although the role of BSR cannot be completely ruled out, the complete lack of light S isotopes in sediments and ores of the Tanyaokou—Dongshengmiao basin indicates that the open system BSR is unlikely the dominant metallogenic mechanism. |
| GAO Zhao-fu,ZHU Xiang-kun,SUN Jian,ZHOU Zi-long.2020.Fe-S Isotope Compositions of the Tanyaokou Sulfide Deposit in Inner Mongolia and Their Constraints on Sulfide Formations[J].Acta Geoscientica Sinica,41(5):675-685. |
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