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Caracterización espectroscópica de la mineralogía y su diversidad en Vesta
M C De Sanctis1, E Ammannito, M T Capria
1Istituto di Astrofisica e Planetologia Spaziali, Istituto Nazionale di Astrofisica, Rome, Italy. mariacristina.desanctis@iaps.inaf.it
Science (New York, N.Y.)
|May 15, 2012
Resumen
Vesta Vesta es una de ellas.
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- Mineralogía de los asteroides Mineralogía de los asteroides.
- La geoquímica espacial es la geoquímica del espacio.
Sus antecedentes:
- Vesta es un gran asteroide con un interior diferenciado.
- Su composición superficial está relacionada principalmente con los meteoritos de howardita-eucrita-diogenita (HED).
- Comprender la mineralogía de Vesta proporciona información sobre los primeros procesos del sistema solar.
Objetivo del estudio:
- Para analizar la mineralogía del asteroide Vesta utilizando datos de la nave espacial Dawn.
- Para investigar las variaciones regionales y locales en la composición de la superficie de Vesta.
- Comprender la historia geológica y la evolución magmática de Vesta.
Principales métodos:
- Análisis de los datos del espectrómetro visible e infrarrojo de la nave espacial Dawn.
- Identificación espectroscópica de los componentes mineralógicos en toda la superficie de Vesta.
- Correlación de los datos espectrales con las composiciones conocidas de meteoritos.
Principales resultados:
- La mineralogía de Vesta es consistente con la de los meteoritos HED.
- Se identificaron distintas regiones mineralógicas, incluido un mayor componente diogenítico en la cuenca de Rheasilvia y un mayor componente eucrítico en las regiones ecuatoriales.
- Evidencia de estratificación estratigráfica mineralógica observada en las paredes de los cráteres y las eyecciones.
Conclusiones:
- La corteza de Vesta está compuesta por una capa eucrítica superior y una capa diogenítica más profunda, expuestas por el impacto de Rheasilvia.
- La variabilidad espectral sugiere un complejo ensamblaje cortical de basaltos eucríticos y acumulados de piroxeno.
- Vesta exhibe una evolución magmática compleja, lo que resulta en una corteza y un manto diferenciados.
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