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近十年,由于黄金价格不断上涨,世界范围内的砂金勘探活动日趋频繁。砂矿常赋存于古河道和河床的凹陷处,往往被后来的侵蚀成因或冰川成因的砂土和砾石覆盖。使用高分辨率地球物理勘探技术,填制基岩和土壤层图,以增加寻找砂金工业矿床的可能性。基岩面常常是控制砂金矿形成的重要因素。 地面探测雷达(GPR)和地震测深法是两种相互辅助的高分辨率技术,可用来填制基岩起伏图及土壤层图。现代雷达探测设备在粗粒土壤中应用效果最佳,探测深度可达30米,所测绘的地层层位之空间分辨率>0.5米。地震折射的空间分辨率大大低于雷达,
In the recent ten years, due to the continuous rise of the gold price, the worldwide gold exploration activities have become more frequent. Sand plains are often found in depressions of ancient rivers and river beds and are often covered by later erosions or glaciers of sand and gravel. Use high-resolution geophysical prospecting techniques to fill bedrock and soil maps to increase the likelihood of finding a gold-bearing industrial deposit. Bedrock surface is often an important factor controlling the formation of placer gold. Ground-penetrating radar (GPR) and seismic sounding are two high-resolution techniques that complement each other and can be used to fill bedrock relief maps and soil layers. Modern radar detection equipment works best in coarse-grained soils with probing depths of up to 30 meters and spatial resolution of> 0.5 meters for stratigraphic beds measured. The spatial resolution of seismic refraction is much lower than radar,