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Los fluidos relativamente oxidados alimentaron los primeros sistemas hidrotermales de la Tierra
Dustin Trail1, Thomas M McCollom2
1Department of Earth and Environmental Sciences, University of Rochester, Rochester, NY 14627, USA.
Science (New York, N.Y.)
|February 9, 2023
Resumen
La Tierra temprana
Área de la Ciencia:
- Geoquímica
- Astrobiología
- Las primeras ciencias de la Tierra
Sus antecedentes:
- Las propiedades de los fluidos litosféricos de la Tierra primitiva son cruciales para comprender el origen de la vida.
- Estos fluidos actuaban como un conducto entre el interior de la Tierra y los sistemas hidrotermales de superficie.
Objetivo del estudio:
- Para inferir las características de los fluidos litosféricos de hace aproximadamente 4 mil millones de años.
- Para modelar la solubilidad y el transporte de metales clave relevantes para el origen de la vida.
Principales métodos:
- Utilizado el análisis químico del circón.
- Realizó experimentos de laboratorio.
- Empleado el modelado geoquímico.
Principales resultados:
- La fugacidad restringida del oxígeno, el contenido de cloro y la temperatura de los primeros fluidos litosféricos.
- Determinó que estos fluidos estaban más oxidados que el manto terrestre temprano.
- Interacción identificada con sistemas acuosos cercanos a la superficie, como las piscinas hidrotermales.
Conclusiones:
- Los primeros fluidos litosféricos desempeñaron un papel importante en la amplificación de los gradientes redox en entornos propicios para la química prebiótica.
- Estos hallazgos apoyan escenarios para el origen de la vida que involucran interacciones entre fluidos profundos de la Tierra y sistemas hidrotermales de superficie.
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