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La historia geológica del carbono orgánico disuelto marino a partir de óxidos de hierro
Nir Galili1,2, Stefano M Bernasconi3, Alon Nissan4,5
1Geological Institute, Department of Earth and Planetary Sciences, ETH Zurich, Zurich, Switzerland. ngalili@ethz.ch.
Nature
|August 13, 2025
Resumen
Los niveles de carbono orgánico disuelto marino (DOC) fluctuaron significativamente en el tiempo geológico. Este estudio reconstruye las antiguas concentraciones de DOC, revelando vínculos entre la química del océano, la oxigenación y la evolución de la vida marina compleja.
Área de la Ciencia:
- Geoquímica
- Paleoceanografía
- Biología marina
Sus antecedentes:
- El carbono orgánico disuelto (DOC) es un importante depósito de carbono que regula los ecosistemas marinos y el CO2 atmosférico.
- Comprender la historia geológica del COD marino es crucial para reconstruir los procesos ecológicos y biogeoquímicos del pasado.
- El conocimiento actual de la dinámica DOC marina antigua es limitado.
Objetivo del estudio:
- Desarrollar y validar un proxy para la reconstrucción de las firmas de carbono orgánico disuelto marino (DOC) del pasado.
- Generar una reconstrucción a largo plazo basada en datos de las concentraciones marinas de COD y sus composiciones isotópicas.
- Para vincular los cambios en el COD marino a la oxigenación del océano y la evolución de la vida.
Principales métodos:
- Utilizado carbono orgánico co-precipitado dentro de los ooides de hierro como un sustituto para el DOC pasado.
- Analizó 26 formaciones marinas que contienen óxido de hierro que abarcan 1.650 millones de años.
- Concentraciones de DOC y composiciones de 13C reconstruidas a través del tiempo geológico.
Principales resultados:
- Las concentraciones marinas de DOC estaban cerca de los niveles modernos en el Paleoproterozoico.
- DOC disminuyó en un 90-99% en el Neoproterozoico, seguido de un fuerte aumento en el Cámbrico.
- El DOC moderno está enriquecido con 13C en comparación con el Proterozoico, potencialmente debido a la innovación biológica.
Conclusiones:
- Interpretó la dinámica del DOC como reflejo de tres estados oceánicos distintos relacionados con la complejidad del organismo y la oxigenación.
- La evolución de la vida compleja, la oxigenación del océano y el ciclo del carbono están interconectados.
- Los hallazgos proporcionan información sobre la evolución acoplada de los ecosistemas marinos y la biogeoquímica durante 1.65 mil millones de años.
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