Microbes Can Destroy Concentric Layers in Ooids.
All articles by Wretch Fossil are here: http://www.wretch.cc/blog/lin440315&category_id=0
### Microbial Influence on Ooids
#### Formation and Growth
1. **Microbial Precipitation**: Microbes can induce the precipitation of calcium carbonate, which contributes to the formation of the concentric layers in ooids. This microbial activity can enhance the growth of these layers by providing nucleation sites and altering local water chemistry to favor mineral deposition.
2. **Biofilm Formation**: Microbial biofilms on the surface of ooids can trap and bind sediment particles, aiding in the accretion of layers. These biofilms can also create microenvironments that promote calcium carbonate precipitation.
#### Potential Destruction or Alteration
1. **Boring and Bioerosion**: Some microbes are capable of boring into ooids, creating microscopic tunnels or cavities within the concentric layers. This bioerosion can disrupt the smooth layering and potentially weaken the structure of the ooid. Boring cyanobacteria and fungi are known examples of microorganisms that can cause such alterations.
2. **Organic Matter Decomposition**: The decomposition of organic matter by microbes within the ooid structure can lead to localized dissolution of calcium carbonate. This process can result in partial destruction or alteration of the concentric layers.
### Examples and Studies
- **Microbial Boring**: Studies have documented microbial borings in ooids, which are seen as microscopic tunnels within the ooid structure. For instance, research on modern and ancient ooids has shown that endolithic cyanobacteria can bore into the carbonate grains, affecting their internal structure (Reid et al., 1992; Reid et al., 2000).
- **Bioerosion Impact**: Research has indicated that microbial bioerosion plays a significant role in the diagenesis of ooids, particularly in environments where microbial activity is high (Riding, 2002).
### 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.**
- **Riding, R. (2002). Microbial carbonates: The geological record of calcified bacterial-algal mats and biofilms. Sedimentology, 49(1), 79-80.**
- **Reid, R.P., Macintyre, I.G., and Steneck, R.S. (2000). Carbonate production by bacterial-algal mats and its preservation in the rock record. Sedimentology, 47(4), 595-609.**
In summary, while microbes can contribute to the formation and growth of ooids, they can also alter or destroy the concentric layers through boring, bioerosion, and the decomposition of organic matter. The net effect of microbial activity on ooids depends on the balance between these constructive and destructive processes.
Wretch Fossil’s website:http://wretchfossil.blogspot.com/
Source: https://wretchfossil.blogspot.com/2024/06/microbes-can-destroy-concentric-layers.html
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