Re-Os Dating of Molybdenite from the Maoduan Lead-Zinc Polymetallic Deposit in Southwestern Zhejiang Province and Its Geological Significance
详细信息
- 责任者：Li Yanjun (Faculty of Earth Resources ; China University of Geosciences ; Wuhan 430074 ; China) ; Wei Junhao
- 刊名：Earth Science
- 出版年：2011
- 卷期：36(2)
- 关键词：铅锌矿床 ; lead-zinc deposit ; 多金属矿 ; polymetallic ores ; 铼—锇计时 ; Re-Os dating ; 浙江 ; Zhejiang Province
- 页码：p.289-298
- 图表：2 illus., 3 tables, 50 refs.
- 分类号：1001
- issnNo：ISSN1000-2383
- isbnNo：CN42-1233/P
摘要
The Maoduan lead-zinc polymetallic deposit, located in uplift area between the Jiangshan-Shaoxing and Zhenghe-Dabu deep faults in southwestern Zhejiang Province, is one of typical lead-zinc polymetallic deposits in this region. Re-Os dating of 5 molybdenite separated from the Maoduan lead-zinc polymetallic deposit gave model ages from (138.6±2.0) Ma to (140.0±1.9) Ma. These data yielded an isochron age of (137.7±2.7) Ma with MSWD=0.7, and a weighted average model age of (139.0±0.8) Ma (MSWD=0.5). This result is in agreement with the Maoduan concealed monzogranite, indicating that Pb-Zn polymetal mineralization was related to granite crystallization. According to the precise Re-Os ages, the authors reported and previous studies, the authors interpret the Maoduan Pb-Zn deposit formed in an extensional setting related to lithospheric extension during the Early Cretaceous in South China.