Preliminarily Study on the Origin of Spodumene-bearing Pegmatite Sediments in Jiajika Orefield and Some Enlightenment
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摘要: 甲基卡矿区是川西稀有金属资源量最丰富的地区之一，前人在矿区开展野外地质调查工作时，因矿区第四系覆盖严重，加之矿区所处自然地理环境十分恶劣，部分砾石中又见到磨光面、冰川擦痕等标志。因此，认为矿区出露的含矿伟晶岩堆积体是第四系冰碛物。然而，在对甲基卡矿区开展了细致的野外地质勘查工作后，结合堆积体分布形态、地形地貌特征、找矿勘探结果等证据，认为矿区含矿伟晶岩堆积体并非第四系冰碛物，而是伟晶岩原地堆积物。基于这一认识，不仅促使甲基卡矿区地质找矿工作实现了较大突破，而且为川西地区今后的地质找矿工作提供了新思路、新方向，值得深入总结和探讨。Abstract: The Jiajika orefield is located in the western part of Sichuan province, which has abundant rare metal resources.The most of the Jiajika orefield is covered by Quaternary stratum and has terrible natural geographical environment, while the polished surface and glacial striation were found on the surface of some conglomerate, which caused the spodumene-bearing pegmatite sediments had been classified as the glacial till of Quaternary when the predecessors carried out geological field work there. However, after carrying out the geological field work carefully, it's believed that these spodumene-bearing pegmatite sediments are not the glacial till of Quaternary and they belong to native pegmatite sediments by combining morphology of spodumene-bearing pegmatite sediments, landform characteristics and prospecting exploration results.This cognition transition not only promotes great breakthrough for years' geological prospecting work in the Jiajika orefield, but also provides new idea, new direction for future geological prospecting work in the western part of Sichuan province, which is worth to be further summarized and discussed.
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