Re-Os Dating of Molybdenite from the Luoboling Porphyry Cu-Mo Deposit in the Zijinshan Ore Field of Fujian Province and Its Geological Significance
详细信息
- 责任者：Liang Qingling ( Institute of Mineral Resources ; CAGS ; Beijing 100037 ; China) ; Jiang Sihong
- 刊名：Acta Geologica Sinica
- 出版年：2012
- 卷期：86(7)
- 关键词：斑岩钼矿床 ; porphyry molybdenum deposit ; 斑岩铜矿床 ; porphyry copper deposit ; 铼—锇计时 ; Re-Os dating ; 福建 ; Fujian Province
- 页码：p.1113-1118
- 图表：illus., 1 table, 27 refs.
- 分类号：1001
- issnNo：ISSN0001-5717
- isbnNo：CN11-1951/P
摘要
Located in the northeastern Zijinshan ore field, the Luoboling Cu-Mo deposit is a large-scale porphyry deposit hosted by the Sifang granodiorite and Luoboling granodiorite porphyry. Re-Os dating of eleven molybdenite separates collected from different depths of ore bodies in the Luoboling Cu-Mo deposit shows that the isochron age is 104. 9±1. 6 Ma and the model ages ranging from 104. 7±1. 6 Ma to 106. 5±1. 5 Ma, with an average age of 105. 64±0. 46 Ma. It indicates that the Luoboling Cu-Mo deposit formed in Early Cretaceous, consistent with the emplacement age of the host rocks, and that the magmatism and mineralization took place under the same geological setting. Since the Zijinshan ore field is composed of several porphyry and epithermal deposits, it is suggested that the ore fluid evolution of Zijinshan ore field may started from 105 Ma, when the Luoboling porphyry Cu-Mo deposit formed. [