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La respiración aeróbica en el Arqueo?

¹Department of Paleobiolgoy, Smithsonian Institution, Washington, DC 20560, USA.

|November 1, 1990

Resumen

Tierra temprana de la Tierra temprana.

Área de la Ciencia:

La geoquímica es la geoquímica.
Ciencias de la atmósfera Ciencias atmosféricas.
Paleontología Paleontología.

Sus antecedentes:

Se cree ampliamente que la atmósfera del Arqueo (hace 3.800-2.500 millones de años) fue anóxica.
Los sumideros de oxígeno como la oxidación del hierro disuelto (Fe (II)) y la oxidación del metano fueron insuficientes para mantener la anoxia.
Las bajas estimaciones de la productividad primaria Arqueana desafían los modelos existentes de regulación del oxígeno atmosférico.

Objetivo del estudio:

Investigar la plausibilidad de la respiración aeróbica temprana en el Eón Arcaico.
Proponer un mecanismo alternativo para regular los niveles de oxígeno atmosférico antes del Proterozoico.

Principales métodos:

Reevaluación de los sumideros de oxígeno basados en carbono orgánico conservado en rocas del Arqueo.
Modelado de los requisitos de oxidación de hierro y metano para mantener la anoxia.
Hipotetizando el desarrollo temprano de la respiración aeróbica.

Principales resultados:

El mantenimiento de la anoxia requeriría una sedimentación de hierro o una oxidación de metano irrealmente alta.
Incluso una productividad primaria mínima sugiere sumideros insuficientes para la acumulación de oxígeno.
El estudio sugiere que se requiere una atmósfera estable y baja en oxígeno (0,2-0,4%).

Conclusiones:

La respiración aeróbica probablemente evolucionó temprano en el Arcaico.
La respiración aeróbica temprana impidió la acumulación excesiva de oxígeno atmosférico.
Esto desafía la visión tradicional de una atmósfera arqueana estrictamente anóxica.

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