评价金地球化学异常的新方法

A NEW TECHNIQUE FOR EVALUATING GOLD ANOMALY

评价金地球化学异常的新方法主要适用于热液型金矿床 ,其原理系基于测得Au与它的共生矿物如黄铁矿、毒砂、黄铜矿、方铅矿、闪锌矿等的相关密切程度以查明金是否呈集中状态存在 ;测定石英包裹Au的含量以了解原始热液中Au的浓度 ,以查明是否具有成矿的地质条件。基于这些勘查地球化学原理 ,拟订了评价Au地球化学异常的新方法。在评价举例中介绍了应用这套评价程序在新疆找到了Au品位高达 2 0 0g/t的金矿体。使用新方法已在我国西北地区评价过 30个金化探异常 ,表明新方法具有准确率高、效率高。

A new geochemical method for evaluating gold anomaly in hydrothermal type gold deposit was presented.The principles of the method lies in that,determing the paragenesis relationship between Au and the heavy minerals as pyrite, arsenopyrite, chalcopyrite, limonite etc to understand whether the gold exists in concentration state or not;determing the contents of Au enclosed in separated quartz to identify roughly whether Au is enriched in original, hydrothermal liquid and to understand the geological condition of Au oreformining.Based on those principles of geochemical explorations, a new method of Au anomaly evaluations were carried out. And an application example was introduced which showed that using this method a gold deposit containing 200g/t of Au was found in Xinjiang Uygur Autonomous Region and thirty Au anomalies from Northwest China have been evaluated, indicating this method is accurate, efficient and low cost.