Responses of ichnoassemblages to paleo-water-depth of the Taiyuan Formation in western North China Basin
Song Hui-bo1,2, Li Juan1, Hu Bin1
1 School of Resources and Environment,Henan Polytechnic University, Henan Jiaozuo 454003, China; 2 Collaborative Innovation Center of Coalbed Methane and Shale Gas for Central Plains Economic Region of Henan Province,Henan Jiaozuo 454003, China
Abstract：In this paper,we studied composition,appearance and distribution of ichnofossils in the carbonates of the Upper Carboniferous-Lower Permian Taiyuan Formation in the western North China Basin,and analyzed the relationships between Sr contents, Sr/Ba values,1000×(Sr/Ca), and δ13C in some ichnofossils burrow and paleo-water-depth. Three types of ichnoassemblages with different water-depths were established: (1)Nereites-Chondrites ichnoassemblage occurred in the lower zone of the shallow sea below the redox interface;(2)Zoophycos-Teichichnus ichnoassemblage formed in the middle zone of the shallow sea between the wave base and redox interface;(3)Zoophycos-Thalassinoides ichnoassemblage occurred in the upper zone of the shallow sea(between the sea level and wave base)or lagoonal environments. Based on various characteristics of these ichnoassemblages in different sections,and paleo-water-depth changes in different area,two major transgressions can be identified in the Taiyuan Formation in the study area. This research provides ichnology basis for detailed studies on evolution of depositional environments and stratigraphic correlation of the Taiyuan Formation in the western North China.
Song Hui-bo,Li Juan,Hu Bin. Responses of ichnoassemblages to paleo-water-depth of the Taiyuan Formation in western North China Basin[J]. JOPC, 2019, 21(6): 999-1012.
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