Abstract As the main type of microbial carbonates,it has become the consensus that stromatolites are mainly constructed by microbial mats. The stromatolitic bioherm of the Second Member of the Tieling Formation in Jixian section,Tianjin,are made of fine-grained stromatolites, interpreted as a microbial structure formed by trapping carbonate muds on microbial mats; they are different from the modern stromatolites and most of the Phanerozoic stromatolites. Particularly, the glauconite and pyrite preserved in the stromatolites represent two types of special mineralization. As a result of sulfate-reducing bacteria,pyrite commonly produced in the study area,is a window to understand the ancient microorganisms. Glauconite that is developed in the high-energy shallow sea is different from the modern glauconite in the production environment; it may not be used as the indicator mineral of the slow depositional rate,nor has the geological significance of sedimentary discontinuity. The two types of mineralization directly suggest that the Tieling stromatolites are formed by precipitation,rather than the capture of carbonate muds. This study provides some useful clues for understanding the characteristics and formation of the Mesoproterozoic stromatolites.
Fund:Financially supported by the National Natural Science Foundation of China(Nos. 41472090,40472065)
Cite this article:
Mei Chao-Jia. Glauconitization and pyritization of stromatolites:A case of the Mesoproterozoic Tieling Formation at Jixian section, Tianjin, North China[J]. JOPC, 2018, 20(3): 453-464.
Mei Chao-Jia. Glauconitization and pyritization of stromatolites:A case of the Mesoproterozoic Tieling Formation at Jixian section, Tianjin, North China[J]. JOPC, 2018, 20(3): 453-464.
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