大兴安岭森林覆盖区金矿土壤离子电导率异常特征离子成份的研究及找矿预测

为了解森林覆盖区金矿体土壤离子电导率异常特征,探讨金矿体土壤离子电导率成份是由哪些种类离子组成,弄清不同种类离子的含量变化关系对电导率的贡献大小,为解释金矿土壤离子电导率异常的形成机制提供理论依据.通过在大兴安岭森林覆盖区虎拉林金矿的研究:(1)在已知的金矿体上测出了清晰的电导率异常,异常呈典型双峰形态"兔耳"状或"锯齿"状, 异常垂直指示金矿体的赋存位置.(2)弄清了金矿体组成土壤离子电导率异常的离子成份特征,其成份主要是HCO-3、SO-24、Ca2 、Cl-、K 、Na 、F-、Mg2 、Mn2 等一套水可溶性离子,经过相关分析得出金矿电导率异常与各水可溶性离子的相关系数是HCO-3＞Ca2 ＞SO2-4＞Cl-＞K ＞F-＞Na ＞Mg2 ＞Mn2 .(3)在未知区的找矿预测中找到3个具有成矿远景的离子电导率异常.

IONIC CONDUCTIVITY ANOMALY CHARACTERISTICS AND IONIC COMPONENTS OF SOIL IN GOLD DEPOSITS IN THE DAXIN'ANLIN FOREST OVERBURDEN REGION

Knowing anomaly characteristics of the ion conductivity of soil (ICS) in Au deposits in forest overburden area, inquiring into components of ICS, and understanding relations between different ions and contributions to the soil conductivity, can provide evidences for forming mechanics of ionic conductivity anomaly of soil in gold deposits. A comprehensive study is carried out in the Hulalin Au deposit in Daxin'anlin forest overburden area. The research results show that a clear conductivity anomaly, demonstrating "rabbit ear" or "sawtooth", can be detected above known ore bodies. Ion components causing ion conductivity anomaly of soil are mainly soluble HCO~-_3, SO~(2-)_4, Ca~(2+), Cl~-, K~+, Na~+, F~-, Mg~(2+), and Mn~(2+), etc. Correlations between ion conductivity anomaly in gold deposit and soluble ions by correlation analysis are HCO~-_3> Ca~(2+)> SO~(2-)_4> Cl~-> K~+> F~->Na~+> Mg~(2+)>Mn~(2+). Three ion conductivity anomaly areas with ore prospecting in unknown mineralization regions have been found.