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¿Estaba la biosfera arcaica al revés?

J C Walker¹

¹Department of Atmospheric and Oceanic Sciences, University of Michigan, Ann Arbor 48109, USA.

|October 22, 1987

Resumen

La fotosíntesis crea carbono orgánico y oxidantes. El transporte diferencial de estos productos, como el oxígeno y el hierro, dio forma a la antigua biosfera de la Tierra, haciéndola oxidarse en la parte inferior y reducirse en la parte superior.

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Área de la Ciencia:

Biogeoquímica La biogeoquímica es la bioquímica.
Geología Geología Geología.
Paleoclimatología Paleoclimatología

Sus antecedentes:

La fotosíntesis produce cantidades equivalentes de carbono orgánico reducido y un socio oxidado.
Estos productos pueden reaccionar, pero los procesos de transporte ambiental a menudo los separan, lo que lleva a distintas zonas redox.
Comprender estas dinámicas redox es crucial para interpretar los primeros ciclos biogeoquímicos de la Tierra.

Objetivo del estudio:

Investigar el transporte diferencial de productos fotosintéticos en la biosfera anóxica del Arcaico.
Para contrastar la estratificación redox de la biosfera arquea con la de la biosfera moderna.
Proponer un modelo para la distribución de oxidantes y reductores en la historia temprana de la Tierra.

Principales métodos:

Modelado conceptual basado en propiedades químicas y procesos de transporte.
Comparación de las condiciones biogeoquímicas modernas y arcaicas.
Análisis de la solubilidad y movilidad de compuestos clave como el oxígeno, el hierro y el carbono orgánico.

Principales resultados:

En la biosfera moderna, el oxígeno se acumula en la atmósfera mientras que la materia orgánica se asienta.
En la Tierra Arquea anóxica, el hierro oxidado, siendo menos soluble, probablemente se asentó más rápido que el carbono orgánico.
Este transporte diferencial habría conducido a un "fondo" oxidante (sedimentos) y una "parte superior" reductora (oceano/atmósfera).

Conclusiones:

La estructura redox de la biosfera está significativamente influenciada por las propiedades químicas de los productos fotosintéticos.
La biosfera arquea probablemente exhibió una estratificación redox inversa en comparación con la biosfera moderna.
Esto sugiere un entorno biogeoquímico fundamentalmente diferente en la historia temprana de la Tierra.