特殊地质地貌区填图物化探技术应用

基于物化探技术方法在特殊地质地貌区填图中的应用实验，介绍从区域物化探数据提取地质填图信息的方法，指出重磁与氡-汞气测联合应用是覆盖区探测隐伏岩体、断裂的高效低成本物化探技术组合。运用基于地球化学理论方法的元素地球化学判别技术，在强烈风化区定量划分风化等级为:基岩-弱风化-中度风化-强风化-全风化-残积土等；指出风化壳元素地球化学行为对原生矿物分解、次生矿物形成具有示踪效应；不同风化层稀土元素富集分异显著，强烈富集于全风化层（岩土界面或风化岩石顶界）中的稀土元素分布模式，可作为界定风化壳分层的重要地球化学判别指标。 

APPLICATION OF GEOPHYSICAL AND GEOCHEMICAL PROSPECTING TECHNIQUES IN SPECIAL GEOLOGICAL AND GEOMORPHIC AREAS

Based on the application experiment of geophysical and geochemical prospecting technique in special geological and geomorphic areas mapping, this paper introduces the methods of extracting geologic information from regional geophysical and geochemical data. It is pointed out that the combination of gravity and Rn-Hg survey is efficient and low-cost for detecting concealed rock and fault in coverage areas. The weathering grades of intensely weathered areas can be clarified into bedrock, weak weathering, moderate weathering, strong weathering, total weathering, residual soil, and so on. Besides that, the geochemical behavior of weathered crust has a trace effect on the decomposition of primary minerals and the formation of secondary minerals. Due to the significant differentiation of REE in different weathered layers, the distribution pattern of REE which are strongly enriched in the whole weathering layer (rock-soil interface or weathering rock top) can be used as an important geochemical identification index for delimiting weathering crust.