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| 新疆东天山小白石头钨(钼)矿辉钼矿Re-Os同位素年龄及成矿时代 | |
| 引用本文： | 李宁,杨富全,李超,张志欣,杨成栋.新疆东天山小白石头钨(钼)矿辉钼矿Re-Os同位素年龄及成矿时代[J].岩矿测试,2019,38(1):112-122. |
| 作者姓名： | 李宁 杨富全 李超 张志欣 杨成栋 |
| 作者单位： | 中国地质科学院矿产资源研究所, 自然资源部成矿作用与资源评价重点实验室, 北京 100037,中国地质科学院矿产资源研究所, 自然资源部成矿作用与资源评价重点实验室, 北京 100037,国家地质实验测试中心, 北京 100037,中国科学院新疆生态与地理研究所, 新疆矿产资源研究中心, 新疆 乌鲁木齐 830011,中国地质科学院矿产资源研究所, 自然资源部成矿作用与资源评价重点实验室, 北京 100037 |
| 基金项目： | 国家自然科学基金项目（41672072） |
| 摘 要： | 小白石头钨(钼)矿床位于新疆东天山造山带中的中天山地块南缘,该矿床是一个由黑云母花岗岩和花岗闪长岩侵入中元古界卡瓦布拉格群形成的矽卡岩型钨(钼)矿床。辉钼矿作为其主要的矿石矿物之一,呈不同产出状态分布于花岗闪长岩、黑云母花岗岩、矽卡岩和石英脉中。目前,对于小白石头钨(钼)矿成矿时代尚有争议,特别是与花岗闪长岩有关的辉钼矿化形成时代缺乏精确的限定。本文选取与花岗闪长岩有关的不同产状辉钼矿进行Re-Os同位素定年,获得Re-Os加权平均模式年龄为245. 0±1. 7Ma,Re-Os等时线年龄为245. 5±4. 3Ma。准确的Re-Os同位素定年限定小白石头钨(钼)矿床的成矿年龄和花岗闪长岩的侵位年龄为245Ma左右,为矿床模型建立和找矿方向确定提供了关键依据,同时也为东天山区域成矿规律总结提供了重要的年代学证据,并指出新疆东天山—甘肃北山地区存在一条找矿潜力巨大的三叠纪钨钼成矿带。 |
| 关 键 词： | 东天山 小白石头钨(钼)矿床 辉钼矿 Re-Os同位素年龄 花岗闪长岩 三叠纪 |
| 收稿时间： | 2018/5/25 0:00:00 |
| 修稿时间： | 2018/7/23 0:00:00 |
Re-Os Isotopic Age of Molybdenite from the Xiaobaishi W-(Mo) Deposit, Eastern Tianshan, Xinjiang and Its Geological Implication |
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| LI Ning,YANG Fu-quan,LI Chao,ZHANG Zhi-xin and YANG Cheng-dong.Re-Os Isotopic Age of Molybdenite from the Xiaobaishi W-(Mo) Deposit, Eastern Tianshan, Xinjiang and Its Geological Implication[J].Rock and Mineral Analysis,2019,38(1):112-122. | |
| Authors: | LI Ning YANG Fu-quan LI Chao ZHANG Zhi-xin and YANG Cheng-dong |
| Institution: | Institute of Mineral Resources, Chinese Academy of Geological Sciences;Key Laboratory of Metallogeny and Mineral Assessment, Ministry of National Resources, Beijing 100037, China,Institute of Mineral Resources, Chinese Academy of Geological Sciences;Key Laboratory of Metallogeny and Mineral Assessment, Ministry of National Resources, Beijing 100037, China,National Research Center for Geoanalysis, Beijing 100037, China,Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences;Xinjiang Research Center for Mineral Resources, Urumqi 830011, China and Institute of Mineral Resources, Chinese Academy of Geological Sciences;Key Laboratory of Metallogeny and Mineral Assessment, Ministry of National Resources, Beijing 100037, China |
| Abstract: | BACKGROUND: The Xiaobaishitou W-(Mo) deposit is located in the Central Tianshan Massif of the Eastern Tianshan, Northwestern China. The deposit is a skarn-type tungsten-molybdenum deposit formed by biotite granite and granodiorite intruding into the Mesoproterozoic Kawabulag Group. As one of the most important ore minerals, molybdenite is distributed in granodiorite, biotite granite, skarn and quartz veins. OBJECTIVES: To use molybdenite in order to constrain the mineralization age of the Xiaobaishitou W-(Mo) deposit by Re-Os dating. METHODS: Different molybdenite grains associated with the granodiorite from the Xiaobaishitou W-(Mo) deposit were selected for Re-Os isotopic dating. The results were compared with the Xiaobaishitou biotite granite age and the chronological data of other Triassic tungsten-molybdenum deposits in the Eastern Tianshan. RESULTS: The molybdenite Re-Os weighted average model age and Re-Os isochron age are 245.0±1.7Ma and 245.5±4.3Ma, respectively. CONCLUSIONS: The dating results indicate that the molybdenite age for mineralization and the emplacement age of the granodiorite are around 245Ma, which is similar to the age of the Xiaobaishitou biotite granite. It provides a key basis for the establishment of an ore deposit model and the determination of the direction for ore prospecting. It also provides important chronological evidence for the ore-forming laws in the eastern Tianshan, and points out that there is a great prospecting potential for a Triassic tungsten and molybdenum metallogenic belt in the eastern Tianshan-Beishan of Gansu. |
| Keywords: | East Tianshan Xiaobaishitou W-(Mo) deposit molybdenite Re-Os isotopic age granodiorite Triassic |
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