中国科学院南京地质古生物研究所机构知识库

Black carbon content and carbon isotope were first reported in the Permian-Triassic boundary strata at Meishan, Changhsing County, Zhejiang Province, China. A main black carbon peak occurs in bed 26 with the value of 0.51% and a minor in bed 24 of 0.20%. The ratio of blcak carbon to totall organic carbon steady rises from the bollom of bed 25 and reaches its peak in bed 26 with the value above 0.40. Carbon isotope of black carbon decreases 2 parts per thousand sharply from bed 24 (MSC24f0) to bed 25 (MSC25a) and then 3 parts per thousand steadily from bed 25 to bed 26. Black carbon record in the Permian-Triassic boundary section at Meishan, a natural record of biomass and fossil material burning, reveals abrupt ecosystem collapse on and and intensive wildfires occurring at the end of the Permian. According to the long lasting or frequent wildifres and large carbon isotope shift of about 5 parts per thousand at event bed (bed 25 and bed 26), coal and methane bydrale are possible materials for burning besides biomass on land. The black carbon record in Meishan Permian-Triassic boundary, indicating abrupt changes of the Earth's surface environment, contributes to understanding the process and cause of mass extinction.