Re-Os Dating of Molybdenites from Chamuhan W-Mo Deposit, Inner Mongolia and Its Geological Implications
详细信息
- 责任者：Wang Mingyan (Department of Mineral Resources ; MINMETALS & HNG ; Changsha 410015 ; China) ; He Ling
- 刊名：Geotectonica et Metallogenia
- 出版年：2013
- 卷期：37(1)
- 关键词：钨矿 ; tungsten ores ; 钼矿 ; molybdenum ores ; 多金属矿 ; polymetallic ores ; 铼—锇计时 ; Re-Os dating ; 内蒙古 ; Inner Mongolia
- 页码：p.49-56
- 图表：illus., 3 tables, 39 refs.
- 分类号：1001
- issnNo：ISSN1001-1552
- isbnNo：CN44-1595/P
摘要
The newly discovered Chamuhan W-Mo deposit is located in the northwest of Keshiketeng county, Inner Mongonia. The Re-Os dating for five molybdenite samples constrains the age of the vein-type Mo mineralization to be (139.3±1.5) Ma (2σ, MSWD=3.3). Given the isotope model ages of between (137.8±2.3) and (139.4±2.1) Ma, averaging (138.8±2.8 ) Ma (2σ, MSWD=0.044), a perfect isochron line is created at 139.3 Ma. The data indicate that the mineralization in Chamuhan W-Mo deposit occurred in Late Jurassic, and is one of the massive Mo mineralization in East China. Comparing with other Mo or Mo-bearing deposits in the regional, it is believed that the Chamuhan W-Mo deposit is the result of the tectonic transaction in East China. The Re contents of molybdenites in Chamuhan vary in range of 0.127 μg/g to 2.317 μg/g, averaging 0.875 μg/g. As Re content in molybdenite can be used as an important indicator on source of ore-forming material, it is likely that the ore-forming material in the Chamuhan W-Mo deposit was derived from the upper crust.
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