Bacterias fósiles con composición mineralógica diferente a la de su entorno. Formación San Ignacio, Paleozoico superior, Cordillera Frontal, San Juan, Argentina

1. E. Prats ¹
2. P. Busquets ¹
3. G. Gallastegui ²
4. S.N. Césari ³
5. A. Cuesta ⁴
6. O. Limarino ⁵
7. F. Colombo ¹

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Abstract

In the San Ignacio Formation, characterized by lacustrine microbialites between active volcanic environments, the elemental composition of mineralized bacteria has been analyzed in order to determine whether remains of its original composition were preserved. Bacteria have been identified in different contexts. There are bacteria in the formation of carbonates between volcanic rocks, in the soil processes that affect these carbonates and volcanic rocks, and also in silicification processes that affect all these rocks in the early stages of diagenesis. It had also made the same analysis with mineralized plant remains. It has been appreciated that in most cases the elemental composition of the environment bacteria and bacteria is the same. Frequently, it has been found bacteria with higher carbon peaks while calcium or silica peaks decreases. In the case of permineralized remains, the carbon preservation is lower than in bacteria. These results lead to continue with analysis in order to advance the knowledge of the original organic composition of bacteria to compare with current similar environments.

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