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五台—恒山地区是Au的低背景区,但五台群变火山岩在成岩、变质和风化—再沉积过程中曾发生过3次活化再分配,其中由区域变质导致的Au矿化形成了工业矿床。该区与中生代过渡同熔型花岗岩类有关的金矿床与区域变质热液金矿具有明显的地质—地球化学差异,显示出金矿化的规模和强度与花岗岩体的Au丰度呈正消长关系,该类矿床中的Au来源于被重熔或被同熔的下地壳—上地幔分布不均匀的Au及重金属硫化物聚集体。
The Wutai-Hengshan area is a low-lying area of Au. However, activation and redistribution of Wutai group volcanic rocks occurred during the diagenesis, metamorphism and weathering-redeposition processes. Au mineralization caused by regional metamorphism formed the industrial Deposits. This area has obvious geo-geochemical differences with Mesozoic metamorphic migmatitic granites and regional metamorphic hydrothermal gold deposits. It shows that the scale and intensity of gold mineralization positively correlate with the Au abundance of granitoids, The Au in this type of deposit comes from Au and heavy metal sulfide aggregates that are re-melted or are not uniformly distributed in the same crust-upper mantle.