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| 四川甲基卡稀有金属矿床134号脉锡石U-Pb定年与地质意义 | |
| 引用本文： | 周雄,周玉,孙宝伟,谭洪旗,岳相元,朱志敏.四川甲基卡稀有金属矿床134号脉锡石U-Pb定年与地质意义[J].岩矿测试,2021(1):156-164. |
| 作者姓名： | 周雄 周玉 孙宝伟 谭洪旗 岳相元 朱志敏 |
| 作者单位： | 中国地质科学院矿产综合利用研究所, 四川 成都 610041;中国地质调查局稀土资源应用技术创新中心, 四川 成都 610041;中国地质调查局金属矿产资源综合利用技术研究中心, 四川 成都 610041;四川省地质矿产勘查开发局四〇五地质队, 四川 都江堰 611830 |
| 基金项目： | 中国地质调查局地质调查项目（DD20190185） |
| 摘 要： | 伟晶岩型锂矿是重要的新兴产业资源,具有重要的战略价值,是我国亟需紧缺的关键矿产。然而,成矿年代学制约了该类型锂矿的成矿作用和成矿机理研究。四川甲基卡稀有金属矿床是我国最大的锂矿床,以134号伟晶岩脉为典型代表。134号伟晶岩脉主要由锂辉石、钽铌铁矿、锆石、曲晶石、绿柱石、锡石、微斜长石、正长石、石英、白云母等组成。本文采集了134号脉中部矿石样品,分选获得锡石,通过LA-MC-ICP-MS锡石U-Pb测年,获得134号伟晶岩脉的锡石U-Pb年龄为203.7±4.6Ma(n=19,MSWD=2.8),代表了该伟晶岩型锂矿床的成矿年龄,表明其成矿作用发生在印支晚期。印支运动晚期稳定的构造环境,为稀有金属的聚集、成矿创造了有利条件,有助于形成甲基卡超大型稀有金属矿床。 |
| 关 键 词： | 锡石U-Pb定年 年代学 伟晶岩型锂矿床 甲基卡 川西 |
| 收稿时间： | 2020/4/25 0:00:00 |
| 修稿时间： | 2020/7/14 0:00:00 |
Cassiterite U-Pb Dating of No.134 Pegmatite Vein in the Jiajika Rare Metal Deposit, Western Sichuan and Its Geological Significances |
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| ZHOU Xiong,ZHOU Yu,SUN Bao-wei,TAN Hong-qi,YUE Xiang-yuan,ZHU Zhi-min.Cassiterite U-Pb Dating of No.134 Pegmatite Vein in the Jiajika Rare Metal Deposit, Western Sichuan and Its Geological Significances[J].Rock and Mineral Analysis,2021(1):156-164. | |
| Authors: | ZHOU Xiong ZHOU Yu SUN Bao-wei TAN Hong-qi YUE Xiang-yuan ZHU Zhi-min |
| Institution: | Institute of Multipurpose Utilization of Mineral Resources, Chinese Academy of Geological Sciences, Chengdu 610041, China;Technology Innovation Center of Rare Earth Resources Application, China Geological Survey, Chengdu 610041, China;Technology Innovation Center of Rare Earth Resources Development and Utilization, China Geological Survey, Chengdu 610041, China;The 405 Geological Brigade of Sichuan Bureau of Geology&Mineral Resources, Dujiangyan 611830, China |
| Abstract: | BACKGROUND: The pegmatite lithium deposit has become important for modern industries with strategic value, which is a key mineral resource in urgent need in China. However, the mineralization age restricts the research on the mineralization process and mechanism of this type of lithium deposit. The Jiajika rare metal deposit is the largest pegmatite lithium deposit of China in the western Sichuan, and the No.134 vein is the most typical pegmatite vein. The No.134 pegmatite vein is mainly composed of spodumene, tantalite, zircon, beryl, cassiterite, plagioclase, orthoclase, quartz and muscovite. OBJECTIVES: To accurately constrain the mineralization age of the No.134 pegmatite vein. METHODS: Laser ablation-multiple collector-inductively coupled plasma-mass spectrometry (LA-MC-ICP-MS) U-Pb geochronology was used on cassiterite. RESULTS: The concordant age in the ore samples was 203.7±4.6Ma, which represented the mineralization age of No.134 pegmatite vein. This age indicated mineralization in the Late Indosinian period. CONCLUSIONS: The stable tectonic environment in the Late Indosinian movement is the favorable condition for accumulation and mineralization of rare metals, which is beneficial for the formation of the super-large Jiajika rare metal deposit. |
| Keywords: | cassiterite U-Pb dating|geochronology|pegmatitic lithium deposit|Jiajika|western Sichuan |
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