Quantitative characterization of ichnological parameters for indicating palaeo-ocean redox conditions: a case study of the end-Permian mass extinction in South China
DING Yi1,2, ZHANG Lijun3
1 College of Environment and Life Sciences,Weinan Normal University,Shaanxi Weinan 714099,China; 2 Geology Department,Northwest University,Xi'an 710069,China; 3 Institute of Resources and Environment,Henan Polytechnic University, Key Laboratory of Biogenic Traces and Sedimentary Minerals of Henan Province,Henan Jiaozuo 454003,China
Abstract：Major biotic and environmental events in Earth history are often accompanied by palaeo-ocean redox condition changes,as biogenetic sedimentary structures in situ,trace fossils play a significant role in reconstructing palaeo-ocean redox conditions. This study analyzes and summarizes the previous ichnological parameters,and suggests the ichnodiversity,bioturbation degree,burrow size,and key ichnotaxa can be quantitatively used to indicate the palaeo-ocean redox conditions. Additionally,Lopingian trace fossils and bioturbation structures in South China are systematically analysed in order to reconstruct the redox conditions during the end-Permian mass extinction. The quantitative ichnological parameters reveal that the ocean anoxic event occurs in late Wuchiapingian,and the ocean anoxia is not permanent in Changhsingian,instead,obvious periodic fluctuations between anoxic/dysoxic and oxic can be observed. The high-resolution quantitative ichnological proxies at Meishan section suggest that ocean anoxia occurs in the top of Bed 24e in the Changhsing Formation,appears to correlate with the biotic mass extinction. The above examples show that the application of ichnological parameters in the reconstruction of palaeo-ocean redox conditions has broad prospects.
DING Yi,ZHANG Lijun. Quantitative characterization of ichnological parameters for indicating palaeo-ocean redox conditions: a case study of the end-Permian mass extinction in South China[J]. JOPC, 2023, 25(2): 405-418.
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