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| 南秦岭宁陕地区月河坪夕卡岩型钼矿Re-Os年龄和矿床学特征 | |
| 引用本文： | 李双庆,杨晓勇,屈文俊,陈福坤,孙卫东.南秦岭宁陕地区月河坪夕卡岩型钼矿Re-Os年龄和矿床学特征[J].岩石学报,2010,26(5):1479-1486. |
| 作者姓名： | 李双庆 杨晓勇 屈文俊 陈福坤 孙卫东 |
| 作者单位： | 1. 中国科学技术大学地球与空间科学学院壳幔物质与环境重点实验室,合肥,230026 2. 国家地质实验测试中心,北京,100037 3. 中国科学技术大学地球与空间科学学院壳幔物质与环境重点实验室,合肥,230026;中国科学院广州地球化学研究所,同位素年代学和地球化学重点实验室,广州,510640 |
| 基金项目： | 中国科学院知识创新工程重要方向项目 (KZCX2-YW-QN509)、国家科技部973项目(2006CB403505)及国家自然科学基金项目(40921002,90814008)联合资助 |
| 摘 要： | 宁陕地区月河坪钼矿床位于南秦岭多金属成矿带,属于夕卡岩型钼矿。本文采用辉钼矿Re-Os同位素定年方法,精确地测定月河坪钼矿的成矿时代。分析结果显示,5件辉钼矿样品Re-Os同位素模式年龄的变化范围小,集中在189.8Ma和195.4Ma之间,获得加权平均年龄值191.4±1.6Ma,与等时线回归计算得到的年龄值193.6±3.5Ma在误差范围内相吻合。结果说明成矿时代为早侏罗纪,成矿作用属于中国北部燕山期大规模成矿期的一部分。结合已报道的成矿年龄资料,月河坪钼矿床可能形成于扬子板块与华北板块的后碰撞造山作用过程,但有可能受到后期岩浆活动的改造和破坏。同时推测在南秦岭地区存在印支末期到燕山早期的成矿事件,这对于秦岭造山带尤其是南秦岭地区钼矿资源勘探具有借鉴意义。 |
| 关 键 词： | 秦岭 月河坪钼矿 辉钼矿 Re-Os同位素定年 |
| 收稿时间： | 2/1/2010 12:00:00 AM |
| 修稿时间： | 4/1/2010 12:00:00 AM |
Molybdenite Re-Os age and metallogeny of the Yueheping skarn molybdenum deposit in Ningshan, southern Qinling |
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| Li SQ,Yang XY,Qu WJ,Chen FK and Sun WD.Molybdenite Re-Os age and metallogeny of the Yueheping skarn molybdenum deposit in Ningshan, southern Qinling[J].Acta Petrologica Sinica,2010,26(5):1479-1486. | |
| Authors: | Li SQ Yang XY Qu WJ Chen FK and Sun WD |
| Institution: | CAS Key Laboratory of Crust-Mantle Materials and Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China;CAS Key Laboratory of Crust-Mantle Materials and Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China;National Analytical Laboratory, Beijing 100037, China;CAS Key Laboratory of Crust-Mantle Materials and Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China;CAS Key Laboratory of Crust-Mantle Materials and Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China |
| Abstract: | The Yueheping molybdenum deposit is located in the multi-metal metallogenic belt of South Qinling orogenic belt, close to the giant molybdenum mining in eastern Qinling belt. 5 molybdenite samples of this deposit yield Re-Os isotopic model ages ranging from 189.8Ma to 195.4Ma, with a weighted mean age of 191.4±1.6Ma. A similar isochron age of 193.6±3.5Ma is also obtained by the isochron regression. This result suggests that the Mo mineralization occurred in Early Jurassic and this ore deposit belongs to the Early Yanshanian large-scale mineralization period in northern China. The Yueheping molybdenum deposit is likely a part of the post-collisional Mo mineralization in the Qinling orogen, which is formed by the collision of the Yangtze and North China plates. On the basis of a summary of previously reported isotopic age data of the Mo deposits in the Qinling area, it is suggested that a mineralization event occurred in Late Indosinian to Early Yanshanian in the Qinling area, but the deposits were probably modified or destroyed in Late Yanshanian events. Hence, the geochronological study of the Yueheping Mo deposit is of significance in the exploration of Mo deposits in south Qinling orogenic belt. |
| Keywords: | Qinling Yueheping Mo deposit Molybdenite Re-Os age |
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