Study on the Fluid Inclusions of Baiyangping Poly-Metallic Deposit in
详细信息
- 责任者：Xue Wei (State Key Laboratory of Geological Processes and Mineral Resources ; School of Earth Sciences and Resources ; China University of Geosciences ; Beijing 100083 ; China) ; Xue Chunji
- 刊名：Acta Petrologica Sinica
- 出版年：2010
- 卷期：26(6)
- 关键词：多金属矿 ; polymetallic ores ; 流体包裹体 ; fluid inclusions ; 兰坪盆地 ; Lanping Basin
- 页码：p.1773-1784
- 图表：6 illus., 1 table, 48 refs.
- 分类号：1001
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
摘要
Based on the petrology and mineragraphy studies by the method of staining of carbonate minerals, the mineral assemblages Baiyangping poly-metallic deposit are sphalerite-galena-dolomite-quartz, as well as Ag-bearing minerals and Cu-bearing minerals, and calcite is mainly a product of mineralization in late stage. The fluid inclusion in the sphalerite as well as the associate gangue minerals is mainly rice-shaped, oval, negative crystal and irregular. According to the analysis of the microthermometry and Laser Raman spectroscopy, the system of the ore-forming fluids is H2O-NaCl-CaCl2, peak value of salinity is in the range of 22.00%～25.00% NaCleqv, ore-forming temperature concentrated between 110.0～180.0℃, and its density over 1.00 g·cm-3. Therefore, Baiyangping is a low-temperature, high-salinity, and low-density poly-metallic deposit. Ore-forming fluid is always in relatively reducing environment, and metal ions together with reducing sulfur start precipitation to form deposits under the changes of the physical and chemical conditions, even though they coexist stably in the same fluid system privately. The factors of geologic background, ore-forming sources and ore-controlling structure lead to the conclusion that Baiyangping poly-metallic deposit has the characteristics of Mississippi Valley type.
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