| 东天山红石金矿区石英钠长斑岩Ar-Ar和U-Pb年龄及构造和成矿意义讨论 |
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| 关键词:Eastern Tianshan Hongshi gold deposit Gandun Formation Early Carboniferous strike-slip |
| 基金项目:国土资源部公益性行业科研专项经费课题(编号: 200911043-13, 201211074-02);地质矿产调查评价项目(编号: 1212011120293, 1212011120294) |
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| Ar-Ar and Zircon U-Pb Dating of Quartz Albitophyres in the Hongshi Gold Ore District of Eastern Tianshan and Its Metallogenic Significance |
| The Hongshi gold deposit is located in Qiugemingtashi-Huangshan ductile shear zone of Qoltag area, Eastern Tianshan. Quartz albitophyres constitute the wall rock of the ore bodies. The ore-bearing strata are Gandun Formation consisting of a series of flysch sediments. Both the quartz albitophyres and the ore-bearing strata have experienced mylonitization. Zircon SHRIMP U-Pb dating shows the age of quartz albitophyres is (344±4) Ma, indicating that the strata of Gandun Formation, which was intruded by the quartz albitophyres, were formed before (344±4) Ma. It means that the Qiugemingtashi-Huangshan area was of bathyal-abyssal facies in the Early Carboniferous period. The mylonitic quartz albitophyres were analyzed by 40Ar-39Ar step incremental heating method, and an 40Ar-39Ar value of (262±1) Ma was obtained. This age is in accordance with the age of dextral strike-slip of the middle and west part of Qiugemingtashi-huangshan ductile shear zone, suggesting that the mineralization of the Hongshi gold deposit was probably related to the strike-slip. In combination with previous research achievements obtained for the metallogenic epoch of the Hongshi gold deposit, the authors have come to the conclusion that dextral strike-slip of Qiugemingtashi-huangshan ductile shear zone was the main factor responsible for the mineralization of the Hongshi gold deposit. |
| SUN Jing-bo,CHEN Wen,LIU Xin-yu,ZHANG Yan,LI Jie,JI Hong-wei,ZHANG Bin.2012.Ar-Ar and Zircon U-Pb Dating of Quartz Albitophyres in the Hongshi Gold Ore District of Eastern Tianshan and Its Metallogenic Significance[J].Acta Geoscientica Sinica,33(6):907-917. |
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