| 西藏洞嘎金矿床地质特征、原位硫同位素组成及成因探讨 |
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| 关键词:Dongga gold deposit geological characteristics in-situ sulfur isotopes ore-forming material source deposit genesis |
| 基金项目:四川省科技计划项目(编号: 2020JDJQ0042);国家自然科学基金项目(编号: 41972084);成都理工大学珠峰科学研究计划(编号: 2020ZF11407) |
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| Geological Characteristics, In-situ Sulfur Isotope Composition, and Genesis of the Dongga Gold Deposit in Xiongcun Area, Tibet |
| The Dongga gold deposit is located in the Xiongcun ore collection area, which is a previously discovered gold mine that is a part of the Gangdese metallogenic belt. However, less research has been conducted in this area, and the genesis of the deposit has not been uniformly agreed upon. A special systematic geological study of the deposit was conducted on the Dongga gold deposit, and the source of the mineralized material was explored by conducting an in-situ sulfur isotope analysis of the sulfides. Subsequently, the genesis of the Dongga gold deposit was discussed. The Dongga gold deposit is controlled by a fracture fissure system of a volcanic mechanism, and 9.55 tons of gold metal have been detected, suggesting a medium-sized scale. The ore bodies are vein-like and nearly parallel to each other. The gold is mainly in the form of inclusions and intergranular gold in pyrite and chalcopyrite. According to the vein interpenetration relationship and mineral coeval combination, the Dongga gold deposit formation process can be divided into hydrothermal metallogenic and epithermal oxidation stages. The hydrothermal metallogenic stage is the general metallogenic stage, which can be further divided into the early metallogenic, main metallogenic, and late metallogenic stages. The δ34S of the Dongga gold deposit ranges from –1.57‰ ~ +5.26‰, with an average value of +1.69‰; it shows a clear tower distribution, indicating a magmatic sulfur source. Combined with previously published data, we believe that the Dongga gold deposit belongs to the hydrothermal vein-type gold deposit on the periphery of the porphyry Cu ± Au metallogenic system. Porphyry type Cu-Au deposits may be present at depths, with considerable potential for the presence of ore. The source of its mineralized material is majorly the mantle, with a small amount of crustal material added in the form of subduction sediments. The gold in the Dongga gold deposit is closely related to chlorite, which is mainly formed by the dissolution migration crystallization mechanism. The formation process of chlorite changes the composition and physical and chemical properties of gold-bearing hydrothermal fluid, which makes the gold in the ore-forming fluid unload, and finally forms Dongga gold deposits in the tuff fracture system. |
| HE Qing,LANG Xing-hai,WANG Xu-hui,DENG Yu-lin,WANG Yong-tao,WU Wei-zhe,XIE Hong-ru,ZHAN Hong-yu,LIU Zhou-ji,JIANG Kai.2023.Geological Characteristics, In-situ Sulfur Isotope Composition, and Genesis of the Dongga Gold Deposit in Xiongcun Area, Tibet[J].Acta Geoscientica Sinica,44(6):1000-1016. |
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