Pb同位素组成打靶法示踪隐伏热液型铀矿有效性研究

Study on effectiveness of Pb isotope composition targeting method for tracing concealed hydrothermal uranium deposits

建立了热液型铀矿Pb同位素组成打靶方法。该方法主要包括研究勘查区不同类型岩石的204Pb、206Pb、207Pb、208Pb同位素组成、建立成矿208Pb/204Pb-206Pb/204Pb、208Pb/204Pb-207Pb/204Pb、208Pb/206Pb-207Pb/206Pb靶标范围及Ⅰ—Ⅳ共4个评级等级、实施测量剖面样品取样及Pb同位素组成分析、按Ⅰ—Ⅳ等级评价测量剖面测量点4个实施步骤。在桃山铀矿田大布矿床进行了方法有效性试验,结果表明该方法在区域上能够反映出矿化点或矿床的位置,是一种有效的土壤覆盖区范围区域热液型隐伏铀矿勘查方法。在该矿田王泥田地区进行了剖面勘查,预测王泥田东南部鱼成排及其附近为重点找矿有利区段。

A target tracing method for 204Pb,206Pb,207Pb,208Pb isotope composition of hydrothermal uranium deposits has been established.This method includes four main steps:studying the lead isotope composition of different types of rocks in the exploration area,establishing the range of 208Pb/204Pb-206Pb/204Pb,208Pb/204Pb-207Pb/204Pb,208Pb/206Pb-207Pb/206Pb isotope composition of metallogenic targets inⅠ-Ⅳgrades,sampling and analysis of isotope composition in the survey section and evaluating the samples accordingⅠ-Ⅳgrades range.The results of validity test in Dabu deposit of Taoshan uranium ore field showed that the method can reflect the location of mineralization point or deposit regionally,and it is an effective regional hydrothermal prospecting method for concealed uranium deposits in soil-covered areas.Profile exploration has been carried out in Wangnitian area of this ore field,and the Yuchengpai area and its vicinity in southeastern Wangnitian area are predicted to be favorable areas for uranium prospecting.