赣南新塘萤石矿区地下水元素钙氟变化及其成矿意义

对新塘脉状矿床及其附近地下水的钙、氟元素进行了系统检测,发现钙、氟含量存在明显的空间分布差异.采矿矿床及其附近地下水的钙、氟含量偏高,而2 km远的地下水钙、氟含量低且接近流域平均值,两处平均含量相差近10倍.钙、氟的相关性分析显示,水体中钙、氟含量具有很好的相关性,揭示该区萤石矿成矿受沉积物钙氟控制,并与地下水运动密切相关,通过热液循环不断淋滤溶蚀围岩获取钙氟形成萤石矿.由此,矿区的钙氟异常变化可以作为找矿的重要指标.

Changes and ore-forming significance of calcium and fluoride in Gannan Xintang fluorite mining area

Gannan is one of the most important areas of high quality fluorite in China.The systematic analysis on the calcium and fluorine ions of groundwater in Xintang fluorite mining area can not only reveal the properties of the mine itself,but also be important for the exploring of new mine areas.Our study results indicated that the ion contents of calcium and fluorine had obviously different spatial distribution.The abundance of calcium and fluorine in the groundwater of deposits and around was much higher,compared to that in the underground water 2 kilometers away from the deposit.The former’s figure was almost ten times the latter’s.The analysis also showed that the contents of calcium have a higher correlation with that of fluorine in the groundwater.The paper revealed that the fluorite was mineralized by calcium and fluorine produced in the process that hydrothermal circulation incessantly leached the wall crack.Hence fluorite mineralization was determined by calcium and fluorine,and was closely related with the groundwater activity in this area as well.We finally reached the conclusion that the abnormal changes of calcium and fluorine could be used as an important indicator for exploring orgs.