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Diagenesis suboxica en formaciones de hierro en bandas
1Department of Atmospheric and Oceanic Science, The University of Michigan, Ann Arbor 48109, USA.
Nature
|May 24, 1984
Resumen
Los minerales carbonatados en formaciones de hierro en bandas muestran un enriquecimiento inusual de isótopos ligeros de carbono (12C). Esto sugiere una temprana oxidación bacteriana del carbono orgánico, utilizando el hierro (III) como aceptor de electrones en un ambiente anóxico.
Área de la Ciencia:
- La geoquímica es la geoquímica.
- La paleobiología es la paleobiología.
- La sedimentología sedimentológica.
Sus antecedentes:
- Las formaciones de hierro en bandas (BIF) exhiben composiciones isotópicas anómalas de carbono.
- El enriquecimiento en isótopos ligeros de carbono (12C) es una observación común en los minerales de carbonato BIF.
Objetivo del estudio:
- Proponer un mecanismo diagenético para el enriquecimiento de 12C observado en carbonatos BIF.
- Para explicar la inusual firma isotópica en estas antiguas rocas sedimentarias.
Principales métodos:
- El estudio emplea una hipótesis geoquímica basada en procesos microbianos.
- Inferencia vías diagenéticas a partir de datos isotópicos y reacciones biogeoquímicas conocidas.
Principales resultados:
- Se propone la temprana oxidación diagenética del carbono orgánico isotópicamente ligero como la fuente del carbonato ligero.
- El hierro (III) se sugiere como el probable aceptor de electrones para esta oxidación en un ambiente anóxico.
Conclusiones:
- La actividad bacteriana durante la diagenesis temprana puede explicar el enriquecimiento anómalo de 12C en carbonatos BIF.
- El mecanismo propuesto destaca el papel del metabolismo microbiano y la química redox en la configuración de las firmas de roca sedimentaria.
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