GSA Connects 2021 in Portland, Oregon

Paper No. 73-4
Presentation Time: 8:55 AM


CUI, Ying1, SHEN, Shuzhong2, ZHANG, Feifei3, WANG, Wenqian2 and ZHANG, Hua4, (1)Department of Earth and Environmental Studies, Montclair State University: Department of Earth and Environmental Studies, 1 Normal Ave, Montclair, NJ 07043, (2)State Key Laboratory for Mineral Deposits Research and School of Earth Sciences and Engineering, Nanjing University, Nanjing, China, (3)Nanjing, NJ, China, (4)State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology and Center for Excellence in Life and Paleoenvironment, Chinese Academy of Sciences, 39 East Beijing Road, Nanjing, 210008, China

The extensive volcanic eruption of the Siberian Traps large igneous province (STLIP) and the felsic volcanic activity in southwest China are thought to be responsible for the end-Permian mass extinction (EPME), during which the temperature rose by ~10 oC1, surface ocean pH decreased by one unit2, and large area of the seafloor became anoxic3. These environmental deteriorations are likely caused by massive amount of CO2 emissions and associated carbon cycle feedbacks, with important implications for the ongoing climate change. The CO2 emission patterns and their links to the ST LIP, however, are still poorly understood. Here we use the known degassing history of the ST LIP from the literature to force an Earth system model of intermediate complexity to reconstruct the carbon cycle dynamics during the EPME and compare the model output to an exceptionally high-resolution geochemical record from South China. CO2 emission and sequestration rates were quantified based on the observed patterns of global carbon isotopes, sea surface temperature, pH, and anoxic areas.

1 Joachimski, M. M. et al. Climate warming in the latest Permian and the Permian–Triassic mass extinction. Geology 40, 195-198, doi:10.1130/g32707.1 (2012).

2 Jurikova, H. et al. Permian–Triassic mass extinction pulses driven by major marine carbon cycle perturbations. Nature Geoscience, doi:10.1038/s41561-020-00646-4 (2020).

3 Zhang, F. et al. Congruent Permian-Triassic δ238U records at Panthalassic and Tethyan sites: Confirmation of global-oceanic anoxia and validation of the U-isotope paleoredox proxy. Geology 46, 327-330, doi: