Rapid carbonate depositional changes following the Permian-Triassic mass extinction: Sedimentary evidence from South China

摘要: Various environmental changes were associated with the Permian-Triassic mass extinction at 252.2 Ma. Diverse unusual sediments and depositional phenomena have been uncovered as responses to biotic changes. Lithological detailed conodont biostratigraphic correlations within six boundary sections in South China indicate rapid fluctuations carbonate deposition. Four distinct phases can be recognized: (1) normal deposition on platform slope during latest Permian; (2) reduced onset of main horizon; (3) expanded areas Hindeodus changxingsensis Zone H. parvus Zone; (4) persistent mud-enriched aftermath transition. Although availability skeletal was significantly extinction, increase did not behave same way. The changes, presented this study, suggest that diverse played key roles its aftermath. An overview hypotheses explain these implies enhanced terrestrial input, abnormal ocean circulation various geobiological processes contributed saturation fluctuations, sedimentary response large volcanic eruptions.