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Diversidad de olivina y piroxeno en la corteza de Marte
J F Mustard1, F Poulet, A Gendrin
1Geological Sciences, Brown University, Providence, RI 02912, USA. john_mustard@brown.edu
Science (New York, N.Y.)
|February 19, 2005
Resumen
Los datos de las naves espaciales Mars Express revelan minerales máficos distintos en Marte. Las regiones ricas en piroxeno con bajo contenido de calcio se encuentran exclusivamente en antiguas unidades marcianas, lo que indica una fuente de manto agotada.
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- La mineralogía es la Mineralogía.
- Geología Geología Geología.
Sus antecedentes:
- La composición de la superficie de Marte es crucial para comprender su evolución geológica.
- Los minerales mafiosos como la olivina, el piroxeno bajo en calcio (LCP) y el piroxeno alto en calcio (HCP) son indicadores clave de la actividad volcánica y la composición del manto.
Objetivo del estudio:
- Identificar y mapear la distribución de distintos minerales máficos en la superficie marciana.
- Investigar el contexto geológico y las fuentes potenciales del manto de estos depósitos minerales.
Principales métodos:
- Se utilizaron los datos del instrumento OMEGA (Observatoire pour la Minéralogie, l'Eau, les Glaces, et l'Activité) en la nave espacial Mars Express.
- Se analizaron las firmas espectrales para identificar olivina, LCP y HCP en la superficie marciana.
Principales resultados:
- Se identificaron regiones distintas ricas en olivino, LCP y HCP en varias unidades geológicas.
- Las regiones ricas en olivina y HCP están presentes en depósitos de diversas edades.
- Las regiones ricas en LCP se encuentran exclusivamente en antiguas unidades de edad noaica.
Conclusiones:
- La ocurrencia restringida de LCP sugiere que los fundidos se derivaron de un manto marciano empobrecido de aluminio y calcio.
- Las extensas regiones oscuras en las llanuras del norte no muestran absorciones significativas de minerales máficos o hidratados, lo que implica diferentes procesos o composiciones geológicas.
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