Zircon U-Pb and Molybdenite Re-Os Dating for the Beiya Gold-Polymetallic Deposit in the Western Yunnan Province and Its Geological Significance
详细信息
- 责任者：He Wenyan (State Key Laboratory of Geological Processes and Mineral Resources ; School of Earth Sciences and Resources ; China University of Geosciences ; Beijing 100083 ; China) ; Mo Xuanxue
- 刊名：Acta Petrologica Sinica
- 出版年：2013
- 卷期：29(4)
- 关键词：金矿 ; gold ores ; 辉钼矿 ; molybdenite ; 云南 ; Yunnan Province
- 页码：p.1301-1310
- 图表：illus., 2 tables, 57 refs.
- 分类号：1001
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
摘要
The Beiya gold-polymetallic deposit lies in the middle of the Cenozoic Jinshajiang-Ailaoshan alkali-rich intrusion belt in the western Yunnan Province. It is a representative ore deposit in studying Himalaya epoch mineralization and shows bright future for further prospecting. The first highly precise dating of the rock-forming and mineralization in Beiya gold-polymetallic deposit is provided in this paper. The U-Pb LA-ICP-MS dating of the zircon from Hongnitang quartz syenite porphyry yields an age of 36.48±0.26Ma. Re-Os dating of molybdenite separated from the skarn ore bodies gives a model age of 36.87±0.76Ma. These ages suggest that the mineralization in the Beiya gold-polymetallic deposit is genetically associated to the quartz syenite porphyry. The Re contents of molybdenite indicate that the ore-forming materials are derived from mantle and crust. Based on the same ages of the rock-forming and mineralization in Beiya gold-polymetallic deposit and other deposits in jingshajiang-Ailaoshan metallogenic belt, it is proposed that these deposits all occurred under the background of India-Eurasia collision when the tectonic regime changing make the thickened lower crust and upper mantle melt partially.