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Un modelo geoquímico para la formación de carbonatos hidrotermales en Marte
1Department of Earth and Planetary Sciences, McDonnell Center for the Space Sciences, Washington University, St. Louis, Missouri 63130, USA.
Nature
|October 5, 1995
Resumen
Marte puede haber perdido cantidades significativas de dióxido de carbono y agua. Los carbonatos hidrotermales ofrecen una explicación plausible para el secuestro de estos volátiles bajo la superficie marciana.
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- La geoquímica es la geoquímica.
- Astrobiología Astrobiología.
Sus antecedentes:
- Se están perdiendo cantidades sustanciales de dióxido de carbono y agua de la atmósfera marciana, los casquetes polares y el regolito.
- El escape atmosférico y los depósitos superficiales no pueden explicar completamente el déficit de estos volátiles.
- Los modelos anteriores sugieren que el agua superficial a largo plazo o las precipitaciones en Marte son poco probables.
Objetivo del estudio:
- Para investigar el potencial de los sistemas hidrotermales para secuestrar dióxido de carbono en Marte.
- Para modelar la formación de carbonatos en entornos hidrotermales marcianos.
Principales métodos:
- Utilizó Islandia como un análogo para los procesos hidrotermales terrestres.
- Empleó el modelado geoquímico.
- Inferencia de la composición de la roca huésped de los meteoritos marcianos.
Principales resultados:
- La formación hidrotermal de carbonato es un mecanismo viable para secuestrar grandes cantidades de dióxido de carbono.
- El modelo sugiere un potencial reservorio subterráneo equivalente a al menos un bar de dióxido de carbono atmosférico.
- La actividad hidrotermal generalizada en el pasado de Marte podría explicar los volátiles desaparecidos.
Conclusiones:
- Los carbonatos hidrotermales proporcionan una solución convincente para el déficit volátil marciano.
- El secuestro subterráneo a través de la actividad hidrotermal ofrece una alternativa a las explicaciones de almacenamiento en superficie.
- Este mecanismo destaca la importancia de los procesos hidrotermales pasados en la historia geológica marciana.
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