Microbes Can Mask Concentric Layers in Ooids.
All articles by Wretch Fossil are here: http://www.wretch.cc/blog/lin440315&category_id=0
### Microbial Influence on Ooid Formation
1. **Micritization**:
- **Definition**: Micritization refers to the alteration of ooid surfaces or internal structures by microbes, resulting in the formation of micrite. This process often masks the original concentric layering with a microcrystalline texture.
- **Process**: Microbes such as cyanobacteria and other biofilm-forming organisms can induce the precipitation of calcium carbonate as micrite. The microbial metabolism, particularly through photosynthesis and respiration, alters the local pH and carbonate saturation state, promoting micrite formation.
2. **Impact on Ooid Structure**:
- **Micritic Coatings**: Instead of distinct concentric layers, ooids can develop micritic coatings due to microbial activity. These coatings may appear as a homogeneous micrite envelope around the nucleus.
- **Micritized Ooids**: Over time, the continuous action of microbes can result in ooids that are completely micritized, losing their original layered structure. Such ooids may appear as fine-grained carbonate grains with little to no visible layering.
### Examples and Studies
- **Reid et al. (1992)**: In their study on micritized ooids, Reid and colleagues discuss how microbial activity leads to the micritization of ooids, highlighting that this process is prevalent in many carbonate platforms.
- **Chafetz and Guidry (1999)**: This study explores microbial influences on carbonate precipitation and the formation of micrite, emphasizing the role of microbes in altering ooid structures.
### References
- **Reid, R.P., Macintyre, I.G., and Post, J.E. (1992). Micritized Ooids: A Major Component of Many Carbonate Platforms. Journal of Sedimentary Petrology, 62(5), 809-818.** [Link](https://www.researchgate.net/publication/262342349_Micritized_Ooids_A_Major_Component_of_Many_Carbonate_Platforms)
- **Chafetz, H.S., and Guidry, S.A. (1999). Bacterial shrubs, crystal shrubs, and ray-crystal shrubs: Bacterial vs. abiotic precipitation. Sedimentary Geology, 126(1-4), 57-74.** [Link](https://www.sciencedirect.com/science/article/abs/pii/S0037073899000652)
### Conclusion
Microbes can produce micrite in ooids instead of forming traditional concentric layers. This micritization process involves the precipitation of microcrystalline calcium carbonate by microbial activity, which can lead to the development of micritic envelopes or fully micritized ooids, masking the original concentric layering. Understanding these processes helps in interpreting the diagenetic history and microbial influences in carbonate sedimentary environments.
Wretch Fossil’s website:http://wretchfossil.blogspot.com/
Source: https://wretchfossil.blogspot.com/2024/06/microbes-can-mask-concentric-layers-in.html
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