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Evidencia de biomarcadores para una importante vía de preservación del carbono orgánico sedimentario
Y Hebting1, P Schaeffer, A Behrens
1Laboratoire de Géochimie Bioorganique, Unité Mixte de Recherche 7509 du CNRS, Université Louis Pasteur, Ecole de Chimie, Polymères, Matériaux de Strasbourg, 25 rue Becquerel, 67200 Strasbourg, France.
Science (New York, N.Y.)
|May 13, 2006
Resumen
La diagenesis temprana implica la hidrogenación no biológica de las biomoléculas a los biomarcadores fósiles. Las especies de azufre como el sulfuro de hidrógeno (H2S) actúan como donantes de hidrógeno, preservando el carbono orgánico en los sedimentos.
Área de la Ciencia:
- La geoquímica es la geoquímica.
- La geoquímica orgánica es la geoquímica orgánica.
- La sedimentología sedimentológica.
Sus antecedentes:
- La hidrogenación de las biomoléculas a los biomarcadores fósiles es vital para la preservación de la materia orgánica en los sedimentos anóxicos.
- Estos primeros procesos diagenéticos siguen siendo poco conocidos.
- La comprensión de estas vías es clave para interpretar el registro rocoso.
Objetivo del estudio:
- Investigar los mecanismos de reducción de las biomoléculas en la diagenesis temprana.
- Identificar los donantes de hidrógeno involucrados en la formación de biomarcadores reducidos.
- Para dilucidar las vías no biológicas en la diagenesis del biomarcador.
Principales métodos:
- Análisis de carotenoides reducidos en sedimentos recientes.
- Experimentos de laboratorio que simulan las condiciones diagenéticas.
- Identificación de las especies de azufre como donantes de hidrógeno.
Principales resultados:
- Se identificaron carotenoides reducidos en sedimentos recientes, lo que indica una diagenesis en etapa temprana.
- Estas reducciones ocurren sin especificidad estructural o estereoquímica, lo que sugiere vías no biológicas.
- Las especies de azufre, específicamente el sulfuro de hidrógeno (H2S), se confirmaron como donantes efectivos de hidrógeno en experimentos de laboratorio.
Conclusiones:
- La hidrogenación no biológica por especies de azufre es un proceso clave en la diagenesis temprana.
- Esta vía contribuye a la preservación del abundante carbono orgánico en las rocas sedimentarias.
- Los hallazgos proporcionan nuevos conocimientos sobre la formación de biomarcadores fósiles a partir de biomoléculas.
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