川西甲基卡稀有金属矿田地表水中稀有金属元素分布特征及意义

2016～2018年系统采集川西甲基卡稀有金属矿田及周边地表水样品88件,测试分析了样品中Li、Be、Rb、Sr、Zr、Nb、Cs、Hf、Ta九种稀有金属元素含量及八种主要阴阳离子含量。结果表明:甲基卡矿田地表水水化学类型主要为HCO_3-Ca型。甲基卡矿区地表水中Li、Be、Nb、Rb、Cs、Ta等稀有金属元素平均含量明显高于川西河流平均值,Zr、Hf元素含量与川西河流均值相近,Sr含量远低于川西河流均值。经甲基卡矿区地表水稀有金属含量与矿脉分布空间耦合验证,地表水中Li、Rb、Cs、Be元素含量对矿脉的存在有明显的响应特征,其含量分布可以有效地服务于稀有金属矿产勘查,针对甲基卡外围地形高差大、切割深的特点,认为根据水地球化学异常来找矿也不失为一种有效方法,可以尝试运用地表水中稀有金属元素异常来缩小找矿靶区。

Distribution characteristics and implication of rare metal elements in surface water of Jiajikamine in western Sichuan Province

From 2016 to 2018, 88 surface water samples of Jiajika rare metal mine and surrounding areas were collected systematically, and the concentration of rare metal elements such as Li, Be, Rb, Sr, Zr, Nb, Cs, Hf, Ta and main ions in the surface water were analyzed. The results show that: 1) the average concentration of rare metal elements such as Li, Be, Rb, Nb, Cs and Ta in the surface water of Jiajika mining area is much higher than that of the rivers in western Sichuan Province; 2) The concentration of Li in surface water in Jiajika mine were sensitive to both surface and deep lithium veins. The high value of the Li concentration in the surface water of Jiajika mine is consistent with the location of the lithium vein and lithium- bearing area; 3) The enrichment characteristics of Li, Be, Rb, Cs in surface water can be used to the prospecting of rare metal mineral resources efficiently. The peripheral working area of Jiajika has to pographical fluctuations so that it is difficult to conducting geological survey work. In this condition, the geochemical anomalies of rare metal in surface water can be tried to used to minify the prospecting area.