The deposit is thought to be resulted from the assimilation of the Middle Carboniferous carbonaceous sediments by the Middle Hercynian granite.Boiling and rolling of the assimilated carbon in the ...

• 围岩中特别是中石碳统的含碳沉积岩被海西中期花岗岩岩浆同化，使碳质聚集并重结晶成石墨。