中性盐溶液提取土壤中金属活动态及其对隐伏矿的指示:以甲基卡稀有金属矿区为例  

Neutral Salt Solution Extraction of Mobile Forms of Metals in Soils and Its Indication of Concealed Orebody: A Case Study of the Jiajika Rare Metal Deposits

作　　者：耿艳 梁斌[1] 徐志强[1] 王秋波 刘婷 户双节 GENG Yan;LIANG Bin;XU Zhiqiang;WANG Qiubo;LIU Ting;HU Shuangjie(School of Environment and Resource, Southwest University of Science and Technology, Mianyang 621010, China)

机构地区：[1]西南科技大学环境与资源学院,绵阳621010

出　　处：《高校地质学报》2019年第1期51-57,共7页Geological Journal of China Universities

基　　金：国家重点研发计划(2017YFC0602702)

摘　　要：以甲基卡稀有金属矿区X03号超大型稀有金属矿体以及804号脉等两个典型隐伏矿体作为研究对象,采用硫酸钾(K_2SO_4)中性盐溶液作为金属活动态提取剂,进行了土壤中Li元素活动态的提取试验。结果表明,Li元素活动态的地球化学异常很好地对应了隐伏矿体的位置,能够有效地指示隐伏矿体的存在。在甲基卡土壤中目标元素内生组分/外生组分比值很高的稀有金属矿区,采用中性盐溶液这类弱提取剂,才能最大程度地排除土壤内生组分的干扰,有效识别隐伏矿体。通过提取条件优化实验,在甲基卡地区采用硫酸钾(K_2SO_4)溶液提取土壤中Li元素活动态的最佳技术参数为:提取剂浓度0.2 mol/L,粒级200目,pH为6.82,固液比为1:5,提取时间为48 h。In the present study, potassium sulfate (K2SO4) solution was used to selectively extract the mobile forms of lithium (Li) element from two soil samples collected from Jiajika, a rare metal mining area (No.X03 super-large rare metal orebody and No. 804 vein). The results show that the geochemical anomaly of Li mobile form is well corresponded to the position of concealed orebody, which can effectively indicate the existence of a concealed orebody. For soils containing high content of endogenous component/exogenous component of target elements in Jiajika area, weak extracts such as neutral salt solution are the best choice to maximally eliminate the disturbance of endogenous components. The best extraction procedure of the mobile forms of Li element in the soil samples is as follows. 2g soil(200 mesh) is extracted by 10 mL 0.2mol/LK2SO4 solution (pH = 6.82) for 48 h.

关 键 词：金属活动态 稀有金属矿 隐伏矿 甲基卡 

分 类 号：P618.6[天文地球—矿床学]