The Hercynian geochemical domain is subdivided into the Dachang geoche-mical stage and the Heshan geochemical stage, four geochemical cycles and12 geochemical facies.

• 对海西地球化学域划分为大厂和合山两个地球化学阶、进而划分了罗富、大厂、石炭、合山四个地球化学旋回,12个地球化学相。