博茨瓦纳杭济地区地表孔雀石化的成因

在博茨瓦纳杭济地区的一个矿区勘查中,地表发现了一条孔雀石化发育的矿(化)体,Cu含量最高可达20%,而该处的激电测深并未在深部发现明显的矿致异常,钻孔岩芯中也未发现明显的含铜矿物.笔者从铜在干旱气候条件下的表生地球化学行为特征方面对该现象进行了分析,认为由于气候干旱及地表的碱性环境造成了地表铜的富集,并指出了在非洲干旱地区寻找铜矿时所应注意的问题.

A discussion on the genesis of surface malachite mineralization in Ghanzi area,Botswana

The authors discovered an outcrop with malachite mineralization in Ghanzi area of Botswana, with the grade of Cu up to 20%.No mineral anomalies were found here with IP sounding method and no obvious copper mineral was found in the drilling core.The authors analyzed such phenomena from the geochemical characteristics of Cu in the dry climate and reached the conclusion that the richness of surface copper in this area results from the dry climate and alkaline environment.Several problems which deserve due attention in looking for copper deposits in dry areas of Africa were also put forward.