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 ...

 
  • 圍巖中特別是中石碳統的含碳沉積巖被海西中期花崗巖巖漿同化,使碳質(zhì)聚集并重結晶成石墨。
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