Calcified Biofilms from Cambrian Oolitic Limestones in China

作     者：LIU Wei ZHANG Xingliang 

作者机构：State Key Laboratory of Continental Dynamics and Department of Geology Northwest University 

出 版 物：《Acta Geologica Sinica(English Edition)》 (地质学报（英文版）)

年 卷 期：2015年第89卷第1期

页      面：70-76页

核心收录：

学科分类：0710[理学-生物学] 071010[理学-生物化学与分子生物学] 07[理学] 

基　　金：financial support from the Major Basic Research Project of the Ministry of Science and Technology of China(Grant:2013CB835002) the Natural Science Foundation of China(Grants:41272036) the China Postdoctoral Science Foundation(Grant:2014M552481) the"Sanqin Scholarship"project of the Shaanxi Authority 

主　　题：geobiology ooids micrite cyanobacteria Cambrian Hubei and Shaanxi provinces 

摘      要：Calcified biofiims are preserved as thin micritic coatings in the Cambrian oolitic limestone of two sections in North and South China. Standard petrographic examination revealed that the biofilms were developed during the early diagenetic stage immediately after the freshly deposited ooids, proceeding in the continuous sequence of depositional processes. The biofilm outlines are highly irregular, with steep sides, tower-like structures and overhanging projections; the internal fabric of the biofilms is composed of roughly laminated micrite aggregates with channel-like structures. Biofilms exhibit a strong fluorescent reaction. Detailed SEM examination suggests that the biofilms are biotically dominated by cyanobacteria. Our study demonstrates that microbial colonies, such as biofilms, can develop on ooid cortices and influence the formation and microstructures of those ooids.