Sedimentary characteristics and palaeoenvironmental significance of the Permian-Triassic transition at Niejiagou section of Shaanxi in eastern Qinling
LI Feiyang1,2, ZHANG Lijun1,2, LI Tairan1, YANG Qiqi1, NIU Yongbin1,2, SONG Huibo1,2
1 Institute of Resources and Environment,Key Laboratory of Biogenic Trace and Sedimentary Minerals of Henan Province, Henan Polytechnic University,Henan Jiaozuo 454003, China; 2 Collaborative Innovation Center of Coalbed Methane and Shale Gas for Central Plains Economic Region, Henan Jiaozuo 454003, China
Abstract：The marine carbonate strata of the Permian-Triassic transition were found in the Niejiagou section of Zhen'an,Shaanxi. It records the succession of biota and environmental changes of shallow-marine carbonate platform in the Permian-Triassic transition,and is a perfect area for studying the depositional response and palaeoenvironmental changes before and after the end-Permian mass extinction. Based on the detailed analysis of carbonate microfacies and biology combination in the Permian-Triassic transition of the Neijiagou section,11 microfacies types are identified,including patched agglomerates,stromatolites,oolitic-layered stromatolites,foraminiferal grainstone,algal-crinoid grainstone,wackestone containing coated and eroded bone debris particles,oolitic grainstone,aggregate grainstone,oolitic wackestone,mudstone and micrite. According to the characteristics of carbonate microfacies and sedimentary indicators,marginal shoal facies,open platform facies and restricted platform facies are divided in the Permian-Triassic transition. The microfacies characteristics reflect frequent sedimentary microfacies changes in the Permian-Triassic transition. The biological succession and stratigraphic sequence of the Permian-Triassic transition in the Niejiagou section have good uniformity correlation with other sections in South China. After the end-Permian mass extinction,low biodiversity and biological abundance,e.g.,small bivalves and crinoid,occur in the shallow-marine carbonate platform in the Early Triassic. The special microbial sedimentary structures dominated around the mass extinction event boundary. Afterwards,the microbialites disappeared and the bioclastic limestone reoccupied. This research can provide new understanding for the coevolution of organisms and the environment caused by the end-Permian mass extinction.
LI Feiyang,ZHANG Lijun,LI Tairan et al. Sedimentary characteristics and palaeoenvironmental significance of the Permian-Triassic transition at Niejiagou section of Shaanxi in eastern Qinling[J]. JOPC, 2022, 24(4): 649-662.
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