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矿床地质  2008 

铅同位素在矿产资源评价中的应用——以甘肃省鹰嘴山金矿区为例

Keywords: 地球化学,铅同位素示踪,隐伏矿定量预测,鹰嘴山金矿,甘肃,铅同位素,矿产资源评价,应用,甘肃省,鹰嘴山,金矿区,mineralresources,evaluation,Pbisotopes,Application,golddeposit,casestudy,Province,大型金矿床,预测资源量,系数,侧伏,尾部,下部,代表

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Abstract:

文章在铅同位素示踪的有关理论和隐伏矿预测方法的基础上,以甘肃省鹰嘴山金矿区为例,提出了利用铅同位素进行隐伏矿深度、形态与资源量预测的方法.在鹰嘴山金矿区共采样122个,分析结果显示:①地表铅同位素勘探线剖面的V1与V2值在矿体及其相邻蚀变带均出现了明显的负异常,并接近区域地壳平均值,且显示出一个明显的变化规律,即自东至西,矿体的V1与V2值存在着从高到低的规律变化.②V2平均值从122线的43.57(蚀变带上)到46线下降至35.67,标志着矿体的揭示深度从东到西存在着由浅至深的变化规律.从116线到90线,矿体V2平均值从40呈线性下降至36.62,表明116线以东进入隐伏区,90~116线达到矿体出露的中上部,而80线以西出露的矿脉已代表了矿体的下部,并趋向于尾部.③从46线向东到116线,地表可见矿体向下的延深变大,从200m增大到1049m,说明矿体整体西高东低,向东侧伏(隐伏).④矿区总平均隐伏系数Rs为3.68,46线至116线,矿体的预测资源量为42.5t,表明鹰嘴山金矿床应为大型-特大型金矿床.

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