| 山西代县滩上钼多金属矿床辉钼矿Re-Os同位素测年及其地质意义 |
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| 关键词:Re-Os isotopic dating molybdenite Daixian County, Shanxi Province |
| 基金项目:由国家自然科学基金(编号: 90914002) |
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| Re-Os Isotopic Dating of Molybdenite from the Tanshang Mo-polymetallic Deposit in Daixian County, Shanxi Province, and Its Geological Significance |
| The Tanshang molybdenium-polymetallic deposit in Daixian County of Shanxi Province is one of the most typical ore deposits in Wutai Mountain-Hengshan Mountain polymetallic ore-forming area within the northern part of North China Craton. The deposit is situated in the contact zone and adjacent rock fractures between the Tanshang complex and Hutuo Group metamorphic gravel-bearing meta-arkose, with the lumpy, veinlet and dotted molybdenites as the ore minerals. On the basis of an investigation of the geological features of the deposit, Re-Os isotopic dating was conducted for seven representative molybdenite samples, which yielded model ages of (129.3±2.0) to (132.3±1.8) Ma, weighted mean age of (131.09±0.98) Ma, MSWD=1.2, initial 187Os of (–0.041±0.036) ng/g and an isochron age of (131.60±0.72) Ma, MSWD=1.08, respectively. Thus the isochron age is interpreted as the formation time of the molybdenite, i.e., Mo-polymetallic mineralization occurred in Early Cretaceous. Similar to other Mo deposits in the Wutai Mountain, Hengshan Mountain of the northern part of North China Craton, the Tanshang molybdenium-polymetallic deposit was closely associated with the Yanshanian large-scale tectonic-magmatic activity and related to the thinning of the North China Craton since Mesozoic. |
| PANG Er-cheng,XI Wei-jie,SHI Guang-hai,YUAN Ye,GUO Jian-feng.2012.Re-Os Isotopic Dating of Molybdenite from the Tanshang Mo-polymetallic Deposit in Daixian County, Shanxi Province, and Its Geological Significance[J].Acta Geoscientica Sinica,33(5):787-793. |
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