阳山矿区水文地球化学特征及成因分析  

Analysis on the characteristics and genesis of hydrogeochemistry in Yangshan gold district in Gansu Province

作　　者：李石桥[1] 余金元 王涛[1] 毛世东[1] 刘多林[1] 朱斌[1] 

机构地区：[1]中国人民武装警察部队黄金第十二支队

出　　处：《黄金》2013年第10期30-34,共5页Gold

摘　　要：对阳山矿区内38件水样进行分析,结合区内地层岩石的地球化学特征,发现区内地下水组成以Ca2+、Mg2+、HCO-3、SO2-4为主,其水化学类型则以HCO3-Ca为主,地下水化学特征与区内地层岩石化学特征相一致。研究还发现,区内地下水在空间分布上也有一定的特征,在地下水的补给区地表分水岭附近形成了以HCO3-Ca为主的地下水,而在径流区及排泄区地下水类型不一,总体而言,地下水水化学成分的形成以区内岩石的分解和水解等化学风化作用为主。区内含砷矿物及黄铁矿的溶解,导致水中SO2-4及As元素含量的异常,也反映了矿区的2种金矿化蚀变现象,为下一步水化学异常圈定及水文地球化学找矿提供了依据。Based on Yangshan gold district studies, analysis of the 38 groundwater samples as well as the geo- chemistry of stratum rock in the region,it is discovered that the groundwater is made up with Ca2 ＋ , Mg2 ＋ , HCO3- , and SO42- ; the primary groundwater type is HCO3-Ca; and the characteristics of hydrogeochemistry are in conformity with geochemistry that of the stratum rock. Moreover, the groundwater interspace distribution also is characterized by that HCO3-Ca dominates at groundwater supply area of the earth＇s surface watershed and the groundwater types are different in the run off area or drainage area. In general, chemical composition of the groundwater is determined mainly by chemical weatherings such as resolving and hydrolysis of the silicate mineral in the district. The resolution of arsenic mineral and pyrite leads to the abnormal contents of SO42- and As in the groundwater, and also explains the two miner- alization alteration in mine, which paves the groundwork for the following work such as determining the hydrogeochemi- cal anomaly area and looking for gold with hydrogeochemistry.

关 键 词：地下水 水文地球化学 成因过程 阳山金矿区 

分 类 号：P641.4[天文地球—地质矿产勘探] TD12[天文地球—地质学]