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Diagenesis del azufre en la turba de los Everglades y origen de la pirita en el carbón

Z S Altschuler, M M Schnepfe, C C Silber

Science (New York, N.Y.)

|July 15, 1983

Resumen

Las bacterias reductoras de azufre impulsan la formación de pirita en pantanos ricos en orgánico al consumir compuestos orgánicos de azufre. Este proceso explica la distribución de azufre en el carbón y los sedimentos orgánicos, incluyendo la pirita que se encuentra en los tejidos fosilizados.

Área de la Ciencia:

La geoquímica es la geoquímica.
Microbiología Microbiología.
La sedimentología sedimentológica.

Sus antecedentes:

Los compuestos de azufre son cruciales en ambientes ricos en orgánicos como los pantanos, influyendo en los procesos geológicos.
Comprender las vías de transformación del azufre es clave para interpretar los registros sedimentarios.

Objetivo del estudio:

Para dilucidar el mecanismo de formación de pirita en la turba de los Everglades.
Para vincular el ciclo microbiano del azufre con la paragénesis de los compuestos de azufre en el carbón y los sedimentos.

Principales métodos:

Análisis de los patrones de transformación de azufre en muestras de turba de la cuenca de los Everglades.
Investigación de los procesos respiratorios disimiladores microbianos.

Principales resultados:

La formación de pirita está directamente relacionada con la utilización microbiana de los compuestos orgánicos de oxisulfuro.
Este proceso microbiano dicta la distribución de las especies de azufre en los carbones bajos en azufre y los depósitos orgánicos relacionados.
El mecanismo explica la presencia de pirita framboidal dentro de los tejidos fosilizados.

Conclusiones:

La respiración disimilatoria de los compuestos orgánicos de oxisulfuro por las bacterias reductoras de azufre es el principal impulsor de la formación de pirita en los pantanos ricos en orgánico.
Esta paragénesis proporciona una explicación unificada para la distribución de los compuestos de azufre y la aparición de pirita en los carbones, los suelos orgánicos y los sedimentos.

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