铅同位素特征与隐伏矿预测评价

Application of Lead Isotope Features to Forecasting Concealed Ore Deposits

基于矿体不同部位的铅同位素组成具有随深度明显变化的效应,提出了"正异常以深部找矿为主,负异常注意扩大横向找矿"的隐伏矿深部预测评价原则。运用铅同位素三维空间拓扑投影特征值V_1和V_2,对汤丹铜矿和龙脖河铜矿的尝试研究获得了初步成功,表明铅同位素特征可应用于隐伏矿体深度的预测。

The method dealing with the eigenvalues of 3-D topological projection for Pb isotopic data could be used not only to divide Pb isotopic province and identify the geochemical steep zones, but also in the geochemical exploration , especially in the forecasting and evaluation of concealed deposits. Due to the correlation between the Pbisotopic features of the various parts of the ore body and the mineralization depth, and based on the successful experience in evaluating buried Cu ore deposits from the Tangdan copper deposits in Dongchuan, and the Longbohe copper deposits in Jinping, Yunnan province, a principle on forecasting concealed deposits was established. There are positive anomalies of eigenvectors for prospecting deep seated ore body and negative anomalies of eigenvectors for enlarging lateral exploration surrounding known deposit. The Pb-isotopic features are applicable to forecasting the depth of concealed orebody.