豫西登封地区寒武系张夏组中部生物扰动构造及其地质意义

doi:10.13278/j.cnki.jjuese.20200163

Abstract

Abstract: Burrowing animals as the builders of ecosystem engineering, their bioturbation structures affect the physical and chemical properies of sediments, which are important for the benthic ecosystems. Abundant of bioturbation structures are preserved in the laminated microcrystalline limestone in the middle part of the Cambrian Miaolingian Zhangxia Formation, Dengfeng area, western Henan Province. In this paper, the methods of geobiology, paleontology and bioturbation index (BI) are used to investigate the depositional environment of the bioturbation structures and their influence on sediments. Most of bioturbation structures have blurred boundaries. The bioturbation index is 2-5, indicating sufficient food supply and high oxygen content in the sediments during the deposition period. In addition, three types of trace fossils are recognized:Thalassinoides bacae, Planolites isp. and Rhizocorallium isp, indicate that the bioturbation sturctures are created by more than one trace maker. The research on the trace fossils and sedimentary characteristics of the Zhangxia Formation indicates a restricted platform environment between oolitic banks that occasionally affected by storms.

Key words: bioturbation structures, Zhangxia Formation, western Henan, Cambrian, trace fossils, restricted platform

CLC Number:

Wang Yujie, Wang Min. Bioturbation Structure and Their Geological Implications from Zhangxia Formation of Cambrian in Dengfeng Area,Western Henan Province[J].Journal of Jilin University(Earth Science Edition), 2021, 51(4): 1019-1029.

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Bioturbation Structure and Their Geological Implications from Zhangxia Formation of Cambrian in Dengfeng Area,Western Henan Province

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