摘要
高质量结晶鳞片状石墨矿床大多赋存于孔达岩系中,在空间上它们都沿着华北地台周边分布,在时间上都为早元古代,碳同位素组成表明这些石墨矿床均属有机成因,是地球上第一次大规模生物活动的产物。
Deposits of high-quality crystalline scaly graphite mostly occur in Khondalite Series. They are all distributed around the North China platform in space and are Early Proterozoic in age. The carbon-isotope composition indicates that these graphite deposits are biogenetic in origin and are the products of the first large-scale activity of organisms on the earth.
