Fluid Evolution of Alteration and Mineralization at the Duobaoshan Porphyry Cu(Mo) Deposit, Heilongjiang Province
详细信息
- 责任者：Wei Hao (Resource Engineering Department ; University of Science and Technology ; Beijing 100083 ; China) ; Xu Jiuhua
- 刊名：Acta Petrologica Sinica
- 出版年：2011
- 卷期：27(5)
- 关键词：斑岩铜矿床 ; porphyry copper deposit ; 斑岩钼矿床 ; porphyry molybdenum deposit ; 流体包裹体 ; fluid inclusions ; 多宝山 ; Duobao Mountains
- 页码：p.1361-1374
- 图表：7 illus., 2 tables, 49 refs.
- 分类号：1001
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
摘要
The Duobaoshan porphyry Cu (Mo) deposit,located in the eastern part of Xingmeng orogenic belt, is the largest porphyry deposit in the Duobaoshan-Aershan metallogenic belt on the central and northern of Daxinganling. According to the vein types and their crosscutting relationships, wallrock alterations, mineral assemblages,alteration and mineralization of the Duobaoshan porphyry Cu (Mo) deposit can be divided into four stages from early to late stage:ⅠPotassium silicification stage; Ⅱsilicification-molybdenum mineralizing stage; Ⅲ phyllic-copper mineralizing stage; and Ⅳ carbonate-quartz stage. Fluid inclusions in quartz can be identified as aqueous water, CO2-rich, daughter mineral-bearing and pure CO2 inclusions. In this paper, trapping pressures of fluid inclusions are estimated to be 110~160 MPa, 58~80 MPa, and 8~17 MPa for stage I, II and III. Microthermomatic with the phenomenon of field and inclusion petrography indicate: Duobaoshan porphyry Cu (Mo) deposit is a complex tectonic-magmatic ore-forming system with thermal fluids from different sources; tectonic fracture system provided a good space for ore-forming fluids to migrate and precipitate.