Characteristics of Ore-Forming Fluids and
详细信息
- 责任者：Lan Tingguang (Key Laboratory of Mineral Resources ; Institute of Geology and Geophysics ; Chinese Academy of Sciences ; Beijing 100029 ; China) ; Fan Hongrui
- 刊名：Acta Petrologica Sinica
- 出版年：2010
- 卷期：26(5)
- 关键词：金矿 ; gold ores ; 山东 ; Shandong Province
- 页码：p.1512-1522
- 图表：illus., 4 tables, 45 refs.
- 分类号：1001
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
摘要
Shicheng gold deposit, located in the Muping-Rushan gold belt of Jiaodong Peninsula, is a typical polymetallic sulphide gold deposit. Fluid inclusions studies show that three stages of inclusions which CO2-rich inclusions formed at the first stage, H2O and CO2-bearing inclusions formed at the second stage and only H2O inclusions formed in the third stage can be identified. The homogenization temperatures and salinities ranging from 256℃ to 360℃ and 3.7% NaCl to 6.9% NaCl for the first stage represent the character of the ore-forming fluid in the early time, 168℃ to 270℃ and 4.49% NaCl to 10.24% NaCl for the second stage represent the property of the main ore-forming fluid, and 123℃ to 178℃ and 0.4% NaCl to 7.6% NaCl for the third stage reflect the property of the ore-forming fluid in the late time. Hydrogen and oxygen stable isotopes indicate that the main ore-forming fluid of the Shicheng gold deposit is the result of mixing between magmatic fluid and meteoric water, while carbon stable isotopes imply that CO2-rich mantle fluid was involved in the ore forming process, and sulfur stable isotopes further reveal that the aurum came from the source induced by mantle-crust interaction. The appearance of Shicheng gold deposit indicates that at least two mineralization events exist in the research area. The earlier one characterized by pyrite-quartz ore happened at the age of about 120 Ma and the later one characterized by polymetallic sulphide ore occurred younger than 111 Ma.