区域化探数据在浅覆盖区地质填图中的应用方法研究

区域化探数据包含丰富的地质信息,可用于浅覆盖区区域地质填图。笔者系统研究了浅覆盖区水系沉积物化学成分与基岩化学成分的关系,利用水系沉积物氧化物成分,以区域岩石化学成分为约束,提出了基岩化学成分推断方法;根据水系沉积物与其矿物化学成分间质量平衡关系,提出了基岩矿物组成推断方法。在此基础上提出了地球化学推断地质图的编制方法,并在典型森林-沼泽浅覆盖区进行了试验,地质调查和钻探工程验证了该方法的有效性。充分利用区域化探资料,提取地质填图信息,是提高浅覆盖区地质填图质量的有效途径。

Method of using regional geochemical data in geological mapping in shallow overburden areas

Regional geochemical data contain abundant geological information and can be used in regional geological mapping in shallow overburden areas. The relationship between the chemical composition of stream sediments and bedrocks in shallow overburden areas is studied and the method of inferring the chemical composition of bedrocks is proposed by using the oxide composition of stream sediments and the chemical composition of regional rocks as the constraint. According to the mass balance between the chemical compositions of stream sediment and its minerals,the inference method of the mineral composition of bedrocks is presented. The compilation method of inferring geological maps according to the regional geochemical data is put forward and is tested in the typical forest-swamp overburden area and the validity of the method is verified by geological survey and drilling. Thus making full use of regional geochemical data to extract geological mapping information is a valid approach to improving the geological mapping quality in shallow overburden areas.