综合找矿方法在河台金矿找矿预测中的应用

河台金矿是一个典型的与韧性剪切带有关的金矿床,也是目前粤西、桂东南已发现的最大的金矿床。为了给深边部的找矿提供科学依据,本文应用伽马能谱、地电化学及数值模拟产生的体积应变异常带对本区进行了找矿预测实验研究。伽马能谱K异常带指示了本区糜棱岩化及热液蚀变过程中引起的钾化蚀变作用,金矿体与糜棱岩化带主要分布在K异常带中;地电化学异常带可能代表了本区不同深度矿体在地表的垂直投影;体积应变异常带及其附近有利于发展为本区的含矿糜棱岩化带。在同一构造成矿体系中,根据相似类比原则,表明以上三种方法在本区进行找矿预测可行。综合以上三种方法,圈定了3个可能的含矿带,建议对其进行验证。

Implication of Synthetical Methods in Prospecting for the Hetai Goldfield, Western Guangdong

The Hetai gold deposit is the largest gold mine in Western Guangdong and Southeastern Guangxi, which is related to the ductile shear zone. The anomalous belts of K, geo-electrochemical value and volumetric strain increment were used for prospecting in order to find more gold orebodies in the Hetai goldfield. The anomalous belts of K indicate the K alteration took place during mylonitization and hydrothermal alteration. Auriferous veins and mylonitized zones commonly occur within or nearby the anomalous high value belts of K. The anomalous belts of geo-electrochemical value represent the vertical projection of allopelagic orebodies. The anomalous belts of volumetric strain increment and adjacent areas are possible auriferous mylonitized zone. The anomalous belts of K, geo-electrochemical value and volumetric strain increment correspond well with 9# mylonitized zone. These anomalous belts have been partially or locally proved to be closely related to gold mineralization. These demonstrate that the methods are feasible for prospecting of the deposit. By the contrast researches of the anomalous belt of K, geo-electrochemical value and volumetric strain increment, three possible auriferous anomalous belts are outlined, which might be plausible Au-bearing mineralized mylonitized zones.