Characteristic and Geological Significance of Microbially Induced Sedimentary Structures(MISS) in Terrestrial P-T Boundary in Xingyang,Western He’nan Province |
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| Authors: | Zheng Wei Qi Yongan Zhang Zhonghui Xing Zhifeng |
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| Institution: | 1.Institute of Resource and Environment, Key Laboratory of Biogenic Traces & Sedimentary Minerals of He’nan Province, He’nan Polytechnic University, Jiaozuo 454003, China; 2.He’nan Shanshui Geological Tourism Resources Development Co., Ltd, Zhengzhou 450008, China |
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| Abstract: | Microbially Induced Sedimentary Structures (MISS) are primary sedimentary structures that arise syndepositionally from microbial community activity. Especially valuable are MISS for the analysis of early Archean (and extraterrestrial) deposits. However, most reports of MISS have focused on the Precambrian and Phanerozoic mass extinction marine sediments, and only a few and terrestrial MISS have been studied. The MISS presented in this paper, which mainly consists of mat growth feature, mat destruction feature and mat decay feature, are well preserved in terrestrial clastic rocks around the P-T boundary in Xiyang area, western Henan. Large U ridges, oriented sand quartz, mica grains and thin clayey laminae arranged parallel to bedding plane are the main features visible under the microscope. Several lines of evidence indicate that the Xingyang MISS are of biogenic origin. Abundant MISS in Xingyang may indicate the degradation of terrestrial ecosystems and proliferation of microbial mats immediately after the severe Permian-Triassic mass extinction. Study aiming at MISS helps to analyze their space distribution in the globe and to probe into links between microbial proliferation and environmental stresses following the end-Permian mass extinction in terrestrial ecosystems. |
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| Keywords: | Microbially Induced Sedimentary Structures Terrestrial ecosystems Premian-Triassic boundary Western Henan Province |
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