Sporopollen assemblage of the Upper Permian Sunjiagou Formation in Yiyang area,western Henan Province and its geological significance
Xing Zhi-Feng1,2,3,4, Fu Yu-Xin1,4, Zheng Wei1,2,3,4, Li Da1,2,3,4, Li Su-Ping5, Liu Yun-Long1,4, Qi Yong-An1,3,4, Li Wan-Ying1,4, Xu Xin1,4, Wu Pan-Pan1,4, Zhang Xiang-Yun1,4
1 College of Resources and Environment,Henan Polytechnic University,Henan Jiaozuo 454003,China; 2 Shandong University of Science and Technology,Shandong Key Laboratory of Sedimentary Mineralization and Sedimentary Minerals,Shandong Qingdao 266590,China; 3 Central Plains Economic Zone Coalbed Methane and Shale Gas Collaborative Innovation Center,Henan Jiaozuo 454003,China; 4 Key Laboratory of Biological Trace and Metallogenic Process,Henan Jiaozuo 454003,China; 5 Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,China
Abstract：A set of continental clastic rocks developed in the Upper Permian Sunjiagou Formation in Yiyang area, western Henan Province. A large number of plant fossils and sporopollen fossils are preserved in the interbedded sandstone and mudstone of the middle member(the Tumen Member)of the Sunjiagou Formation. Based on the sedimentary characteristics and the regional stratigraphic correlation of Sporopollen assemblage, the geological age of the Tumen Member is determined. Furthermore, according to the relationship of sporopollen fossils and their information function, combined with the value of trace element Sr/Cu, the palaeoclimatic environment of the Yiyang area is qualitatively and semi-quantitatively analyzed. A total of 52 genera of sporopollen fossils were found, with gymnosperm pollen dominant, which are similar to the characteristics of the Late Permian sporopollen assemblage in North China. It is inferred that the Tumen Member of Sunjiagou Formation in the Dayulin section belongs to the Changxing Age of the Late Permian. The above results may provide a reference for the study of continental sedimentary environment, palaeobotanical background and palaeoclimate evolution in the Late Permian of North China.
Xing Zhi-Feng,Fu Yu-Xin,Zheng Wei et al. Sporopollen assemblage of the Upper Permian Sunjiagou Formation in Yiyang area,western Henan Province and its geological significance[J]. JOPC, 2021, 23(5): 901-918.
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