Ichnonetwork analysis of the Lower-Middle Triassic in Jiyuan area,western Henan Province
XU Xin1, XING Zhifeng1,2, ZHENG Wei1,2, QI Yong’an1,2, LI Wanying1, WU Panpan1, ZHANG Xiangyun1, WAN Enzhao1, HE Junmiao1, LI Da1,2
1 Institute of Resources and Environment, Henan Polytechnic University,Henan Jiaozuo 454003,China; 2 Key Laboratory of Biogenic Traces and Sedimentary Minerals of Henan Province,Henan Jiaozuo 454003, China
Abstract The Lower Triassic Heshanggou Formation and Middle Triassic Ermaying Formation in western Henan Province represent terrestrial fluvial-lacustrine deposits. Six ichnospecies/five ichnogenera and nine ichnospecies/seven ichnogenera have been identified in the Heshanggou Formation and the lower-middle members of the Ermaying Formation in the Jiyuan area respectively. Based on ichnonetwork analysis,the ichnonetwork of the Heshanggou Formation and the lower-middle members of the Ermaying Formation was constructed to explore the variety of benthic metazoan after the Permian-Triassic Mass Extinction(PTME). The analysis of ichnonetwork shows that during the depositional period of the Heshanggou Formation to the lower-middle members of the Ermaying Formation,the number of nodes,the diameter,the average clustering coefficient and average path length of the ichnonetwork increase significantly. However,the average degree,average weighting degree and density of the ichnonetwork decrease slightly. The complexity of the ichnonetwork and the enhancement of the adaptability of trace makers to harsh environments of the Early and Middle Triassic ichnonetwork has become a potential sign of biological recovery after the mass extinction. Combined with previous studies,the biological recovery and ecological recovery after PTME may follow the similar pattern in North China, though this pattern still need to be corroborated and supplemented by the follow-up studies with more fossil evidences.
Fund:National Natural Science Foundation of China(Nos. 41772110,41872111),Youth Program of National Natural Science Foundation of China(No.41902113),Key Research Project of Higher Education Institutions in Henan Province(No.20A170010),Doctoral Fund of Henan Polytechnic University(No. B2020-54)
Corresponding Authors:
ZHENG Wei,born in 1979,Ph.D.,is a professor at Institute of Resources and Environment,Henan Polytechnic University. He is mainly engaged in researches on sedimentary geology and ichnology. E-mail: zhengw99@hpu.edu.cn.
About author: XU Xin,born in 1996,a masteral degree candidate,is mainly engaged in research on ichnology. E-mail: 3302386307@qq.com.
Cite this article:
. Ichnonetwork analysis of the Lower-Middle Triassic in Jiyuan area,western Henan Province[J]. JOPC, 2023, 25(2): 419-430.
. Ichnonetwork analysis of the Lower-Middle Triassic in Jiyuan area,western Henan Province[J]. JOPC, 2023, 25(2): 419-430.
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