金有明显的亲铁、亲镁性、异氧性和向心性。因此,它在地壳中的平均含量仅3.5ppb,地幔中为5ppb,地核中则高达2600ppb。前寒武纪地壳因富含中基性火山岩,较偏基性,又因古老地壳代表着地壳发育的初始阶段,那时地壳厚度不大,较富金的地幔物质容易到达地壳,所以金的丰度较高,大于3.5ppb。国内外重要金矿,几乎都与前寒武纪地壳有 Gold has a clear pro-iron, magnesium, oxygen and concentric. Therefore, it has an average content of only 3.5 ppb in the crust, 5 ppb in the mantle and up to 2600 ppb in the core. Because the Precambrian crust is rich in medium-volcanic rocks and is more basal, and because the ancient crust represents the initial stage of crustal development, when the crust thickness is small and the richer mantle material easily reaches the crust, gold Abundance is higher than 3.5ppb. Important gold deposits at home and abroad, almost all with the Precambrian crust