| 川西甲基卡和可尔因矿田稀有金属成矿特征差异性及成因探讨 |
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| 关键词:Songpan–Ganzi orogenic belt Jiajika ore field Keeryin ore field granite pegmatite rare metals spodumene |
| 基金项目:国家重点研发计划“战略性矿产资源开发利用”专项“我国西部伟晶岩型锂等稀有金属成矿规律与勘查技术”项目(编号: 2021YFC2901900; 2021YFC2901905);中国地质调查局地质调查项目“战略性矿产重点远景区矿产地质调查”(编号: DD20221684);“松潘-甘孜成锂带锂铍多金属大型资源基地综合调查评价”(编号: DD20190173);“中国矿产地质志”等项目(编号: DD20221695; DD20190379) |
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| Discussion on the Difference of Metallogenic Characteristics and Genesis of the Jiajika and Keeryin Rare Metals Ore Fields in Western Sichuan |
| The Songpan–Ganzi orogenic belt is mainly located in western Sichuan in China, and Middle–Upper Triassic strata are widely distributed in the region. Continental-continental collision crust-derived modified granitoids are unevenly concentrated in the strata, from which rare metal granitic pegmatites dominated by lithium are derived. The most representative are the Jiajika and Keeryin granitic pegmatite rare metal ore fields. At present, super-large lithium deposits have been explored in both of them. The mineralized pegmatite veins are mainly composed of spodumene-rich muscovite-albite-K-feldspar type granitic pegmatite veins, which are distributed in the Middle–Upper Triassic sedimentary rock series of thermal contact metamorphism in the periphery of the mother rock-two-mica granite. These veins are related to the intrusion of the surrounding rock and show different degrees of contact metasomatic alteration with the surrounding rock. In view of these common points, our understanding of the mineralization of these two ore fields and prospecting ideas have, for a long time, been unified with the metallogenic model of the Jiajika ore field. However, with advances in research, it has been found that they have both similarities and differences. For example, the structure-magma environment of the two ore fields, lithology and alteration of the surrounding rock produced by the granitic pegmatite, structure of the mineralized pegmatite vein, and diversity of ore-forming minerals have different characteristics. Based on a summary of their respective characteristics, this study describes a preliminary analysis of the causes of the differences, which provides a new basis for improving the diagenesis and mineralization theory of the granitic pegmatite in western Sichuan and opening new prospecting directions. |
| YANG Yue-qing,LIU Shan-bao,WANG Deng-hong,DAI Hong-zhang,LIU Li-jun,LI Xin.2023.Discussion on the Difference of Metallogenic Characteristics and Genesis of the Jiajika and Keeryin Rare Metals Ore Fields in Western Sichuan[J].Acta Geoscientica Sinica,44(3):419-433. |
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