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Evidencia del generador de imágenes microscópicas de Opportunity para el agua en Meridiani Planum
K E Herkenhoff1, S W Squyres, R Arvidson
1U.S. Geological Survey Astrogeology Team, Flagstaff, AZ 86001, USA. kherkenhoff@usgs.gov
Science (New York, N.Y.)
|December 4, 2004
Resumen
El rover Opportunity fue lanzado.
Área de la Ciencia:
- Geología Geología Geología.
- Ciencias planetarias Ciencias planetarias.
- Exploración de Marte La exploración de Marte.
Sus antecedentes:
- La superficie marciana en Meridiani Planum exhibe diversas características geológicas.
- Comprender las texturas del suelo y las rocas proporciona información sobre los entornos pasados de Marte.
Objetivo del estudio:
- Para analizar las texturas a microescala de suelos y rocas en Meridiani Planum.
- Investigar los procesos de formación de las características geológicas, incluidas las esferulas de hematita.
Principales métodos:
- Utilizó el generador de imágenes microscópico en el rover Opportunity.
- Se analizaron imágenes de texturas de suelo y roca con una resolución de 31 micrómetros por píxel.
- Creó mosaicos de imágenes para estudiar estructuras sedimentarias como la estratificación cruzada.
Principales resultados:
- Algunos suelos mostraron una cementación débil en el milímetro superior, mientras que otros carecían de cohesión.
- La laminación y la estratificación cruzada a escala milimétrica en afloramientos rocosos sugieren deposición por agua corriente.
- Vugs en las caras de roca probablemente representan moldes de disolución de minerales solubles durante la diagenesis.
- La evidencia microscópica apoya el origen diagenético concretionario de las esferulas ricas en hematita.
Conclusiones:
- Las micro-texturas indican variadas propiedades del suelo y procesos sedimentarios en Meridiani Planum.
- La evidencia sugiere que la actividad del agua en el pasado y las alteraciones diagenéticas dieron forma a la superficie marciana.
- Esferulas de hematita probablemente se formaron como concreciones diagenéticas dentro del suelo marciano y el registro rocoso.
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