The Re-Os Isotope System of the Xiongcun Porphyry Copper-Gold Deposit, Tibet
详细信息
- 责任者：Huang Yong (Chengdu University of Technology ; Chengdu 610059 ; China) ; Tang Juxing
- 刊名：Geology in China
- 出版年：2013
- 卷期：40(1)
- 关键词：斑岩铜矿床 ; porphyry copper deposit ; 铼—锇计时 ; Re-Os dating ; 西藏 ; Tibet
- 页码：p.302-311
- 图表：illus., 2 tables, 34 refs.
- 分类号：1001
- issnNo：ISSN1000-3657
- isbnNo：CN11-1167/P
摘要
Re-Os dating of molybdenite is an efficient means to restrict the time of mineralization. The age of mineralization of the Xiongcun porphyry copper-gold deposit is confined between 171 Ma and 175 Ma based on this study and other data available. No. Ⅰ ore body of the Xiongcun deposit was affected by later magmtic thermal event. Molybdenite contains trace K-Si silicate enriched in Re. As a result of this event, the Re content of molybdenite is one to four times higher than that of molybdenite in No. Ⅱ ore body and No. Ⅲ ore body, and the age of molybdenite in No. Ⅰ ore body is younger than the real age. The authors also compared the Re content of molybdenite between this deposit and other porphyry-skarn deposits within this belt and found that the content of Re shows systematic variation. The Re content of the Xiongcun porphyry copper-gold deposit is one order of magnitude high than that of Miocene porphyry deposits and two order of magnitude higher than Paleocene to Eocene porphyry-skarn deposits. The Re variation is related to the source of metal, the content of molybdenum, the composition of magma and the physical/chemical condition of magmatic -hydrothermal solution.