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本文介绍了应用空载雷达(SIR-B)和数字磁场数据完成圭亚那地盾雨林区调查分析的结果。研究目标是尽可能对地球物理数据集做出解释,获取一张普查地质图,以便在此类恶劣环境下制定地面工作计划。在解释空载雷达图像的基础上,我们识别出了线状地貌特征。对磁场数据做数字处理后,可给出简化极磁异常的晕渲地形图、阶梯状磁异常图及虚拟重力梯度(磁化边界线)。最终结果为一张地质普查图,图中圈出了阶梯状结构,并确定了具地形异常和磁异常的地质断层。九十年代期间给出的空载雷达覆盖及大量的数字航磁勘探数据表明,上述方法可有效地应用于Guiana地盾其余地区的地质普查成图。
This article presents the results of a survey of the Guyana shield rainforest area using the no-load radar (SIR-B) and digital magnetic field data. The objective of the study is to interpret geophysical data sets as much as possible and to obtain a census geological map to develop a ground work plan in such harsh environments. Based on the interpretation of the no-load radar image, we have identified the linear topography. After digital processing of the magnetic field data, we can present the halo rendering topographic map, the staircase magnetic anomaly map and the virtual gravity gradient (magnetization boundary line) that simplify the pole magnetic anomaly. The end result is a geologic survey showing a staircase structure and a geological fault with topographic and magnetic anomalies. No-load radar coverage and a large number of digital aeromagnetic exploration data given during the 1990s show that the above method can be effectively applied to the geological mapping of the rest of the Guiana shield.