Intensive Wildfire Associated With Volcanism Promoted the Vegetation Changeover in Southwest China During the Permian−Triassic Transition

Palaeo-wildfire, which had an important impact on the end Permian terrestrial ecosystems, became more intense in latest globally, evidenced by extensive occurrence of fossil charcoals. In this study, we report abundant charcoals from upper part Xuanwei Formation and Permian–Triassic transitional Kayitou Lengqinggou section, western Guizhou Province, Southwest China. These are well-preserved with anatomical structures can be classified into seven distinctive types according to their characteristics. Organic carbon isotopic analyses both bulk rocks show that δ 13 C org values notably negative than those Formation, a excursion 4.08‰ immediately above volcanic ash bed middle uppermost coal Formation. Charcoals high reflectance (Ro mean = 2.38%) discovered below bed. By contrast, 1.51%) much lower indicating palaeo-wildfire have changed crown fires surface fires, was probably due retrogression vegetation systems during extinction. Based evidence, suppose palaeo-wildfires frequent severe since climate drier China, eventual changeover ecosystems China could caused volcanism.