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Destrucción de los minerales de arcilla por la salmuera en el cráter Gale, Marte
T F Bristow1, J P Grotzinger2, E B Rampe3
1Eobiology Branch, NASA Ames Research Center, Moffett Field, CA 94035, USA. thomas.f.bristow@nasa.gov.
Science (New York, N.Y.)
|July 10, 2021
Resumen
Los datos del rover Curiosity revelan una infiltración localizada de salmuera pobre en sílice en las antiguas rocas del lecho marciano. Este hallazgo sugiere una desestabilización generalizada de minerales de silicato en los primeros tiempos de Marte, que impactó en los procesos geológicos y astrobiológicos.
Área de la Ciencia:
- Geología
- Astrobiología
- Ciencias planetarias
Sus antecedentes:
- Las rocas sedimentarias de Marte ofrecen información sobre antiguos procesos geológicos y astrobiológicos.
- El rover Curiosity está investigando el Monte Sharp en el cráter Gale, examinando los estratos del lecho del lago de unos 3.500 millones de años.
Objetivo del estudio:
- Analizar las variaciones espaciales en la mineralogía dentro de las rocas sedimentarias equivalentes en el tiempo.
- Para entender el papel de las salmueras en la alteración de los estratos rocosos en el antiguo Marte.
Principales métodos:
- El rover Curiosity atravesó desde la cresta de Vera Rubin hasta Glen Torridon.
- Análisis de la mineralogía en estratos de roca sedimentaria separados por menos de 400 metros.
Principales resultados:
- Se observaron diferencias espaciales significativas en la mineralogía en estratos rocosos equivalentes en el tiempo.
- Estas variaciones se atribuyen a la infiltración localizada de salmueras pobres en sílice.
Conclusiones:
- Infiltración de salmuera pobre en sílice, relacionada con la deposición de sulfato de magnesio, rocas sedimentarias alteradas localmente.
- La amplia distribución de depósitos de sulfato sugiere que esta desestabilización de silicatos impulsada por la salmuera fue un proceso común en los primeros tiempos de Marte.
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