Abstract:

Microbial calcification has become a hot topic of the study on microbial carbonate rocks. In the micro, abundant microbial fossils were discovered in Cambrian carbonate stromatolites of western Henan, which are Girvanella and Renalcis of Cyanobacteria with filamentous and spherical features. According to the state of microbial fossils in laminated stromatolites and related fossil evidence in western Henan, the Cambrian stromatolites calcification is of microbial interaction, including physical calcification and chemical calcification. The physical calcification includes 2 calcification pathways, and the chemical calcification includes chemical inducing and chemical control or more calcification pathways. The result of various calcification and the evidence caused by microbial initiative building effect can be clearly seen by using SEM, which are lower psephicity particles and dark stucco, etc. The results show that the stromatolites’ organic genesis and the hydrodynamic condition are important factors affecting calcification way of those stromatolites.