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底岩型砂矿的主要形成机制在于,当河流穿过含金沉积-变质岩及侵入岩时,深侵蚀时期由于金粒在磨损之前沿着坚硬岩石中不断张开的裂隙下沉,从而造成金在底岩裂隙中的残积聚集。在深侵蚀阶段由于冲积层的运移而生成原生砂金矿,但不是在侵蚀地段的河床沉积层中,而是在距河底一定深度(2～20～50m)的河床岩石中。因此,金的这种富集属于“残积-基岩”型。
The main formation mechanism of the bedrock type sandstone is that when the river passes through the gold-bearing sedimentary-metamorphic rocks and intrusive rocks, the gold grains sink along the continuously open fractures in the hard rock prior to wear during the deep erosion period, resulting in the formation of gold The residual accumulation in the fissures of the rock. In the deep erosion stage, because of the alluvial layer migration, the native gold and gold deposits are generated, but not in the sediments of the riverbed in the erosion area, but in the river bed rocks with a certain depth (2 ~ 20 ~ 50m) from the river bottom. Therefore, this enrichment of gold belongs to the “residual plot - bedrock” type.