Fluid Inclusion Constraints on the Origin of Dongmozhazhua Pb-oft-com:office:smarttags" />
详细信息
- 责任者：Liu Yingchao (Institute of Geology ; CAGS ; Beijing 100037 ; China) ; Hou Zengqian
- 刊名：Acta Petrologica Sinica
- 出版年：2010
- 卷期：26(6)
- 关键词：铅锌矿床 ; lead-zinc deposit ; 流体包裹体 ; fluid inclusions ; 青海 ; Qinghai Province
- 页码：p.1805-1819
- 图表：7 illus., 5 tables, 44 refs.
- 分类号：1001
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
摘要
Based on detailed field work for geology of Dongmozhazhua Pb-Zn ore deposit and detailed observation of fluid inclusion sections of ores, the authors have done systematic work on fluid inclusions in this deposit. According to the fluid inclusion petrography there is just one type of fluid inclusions-liquid fluid inclusions in Dongmozhazhua Pb-Zn ore deposit. Based on the results of microscopic measuring temperature work, fluids before, at and after ore-forming stage are not continuous and they have different temperatures and salinities. Based on the results of gas chromatographic analysis, liquid chromatographic analysis and laser Raman spectrometry analysis, the gas compositions of group and single fluid inclusions are mainly H2O, CO2, N2, a little CO, CH4, C2H2, C2H4, C2H6 and a little O2 and the liquid part of ore forming fluid belongs to Ca2+-Mg2+-Na+-Cl--SO42--F-system. By analyzing the data above, the fluids were considered mainly derived from basin brine. The fluids changed from weak reducing to oxidizing and then to weak reducing again and the sulfides precipitated more in the oxidizing environment. The process of dolomitization made rock porosity increase and prepared first spaces for ore precipitation.
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