Abstract：The ooids in oolitic limestones of the Cambrian Mantou Formation in Yiyang area,western Henan can be divided,based on their mophology, structures and calcite composition, into 4 types,such as irregular radial micritic ooids, micritic envelope bright crystalline epidermis ooids,tangential-radial micritic ooids and regular radial microsparry ooids. They are mainly composed of micritic calcites that can be found in the different positions of ooids. These ooids are obviously different from those in the Zhangxia Formation that consist of sparry calcites. Under the SEM,the micritic calcites in ooids display hexagonal honeycomb texture and flake wall which are considered to be the cell structure of bacteria or cyanobacteria and the result of tangential arrangement of attached tiny grain around them. The mineral of honeycomb texture is mainly composed of calcium carbonate which is considered to be the result of cyanobacteria disintegration. The above features indicate that the micritic calcites in ooids are closely related to microbial activities,which is of great significance to elucidate the oolitic genesis affected by microbes.
Chen Bai-Bing,Qi Yong-An,Zheng Wei et al. Micritic calcites in ooids and their genetic analysis from the Cambrian Mantou Formation in Yiyang area, western Henan Province[J]. JOPC, 2019, 21(4): 603-612.
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