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Los depósitos de carbonato brillante como evidencia de alteración acuosa en (1) Ceres

M C De Sanctis, A Raponi, E Ammannito

|July 1, 2016

Resumen

Las áreas brillantes en el planeta enano Ceres, particularmente en el cráter Occator, son ricas en carbonato de sodio. Estos hallazgos sugieren salmueras y sólidos cristalizados desde abajo, lo que indica posibles fluidos subterráneos en Ceres hoy.

Área de la Ciencia:

Ciencias planetarias
Astrogeología
Geoquímica

Sus antecedentes:

La superficie de Ceres es en su mayoría oscura, pero presenta áreas brillantes, especialmente en el cráter Occator.
Las interpretaciones anteriores sugerían sulfato de magnesio hidratado en estas áreas brillantes.
La composición media de la superficie incluye materiales de bajo albedo, filosilicatos de magnesio, filosilicatos amoniados y carbonatos.

Objetivo del estudio:

Para analizar la composición de las áreas brillantes en el cráter Occator en Ceres.
Investigar el origen y las implicaciones de estos depósitos brillantes.

Principales métodos:

Observaciones en el infrarrojo cercano de alta resolución espacial y espectral.
Análisis espectroscópico de regiones brillantes dentro del cráter Occator.

Principales resultados:

Los espectros indican una presencia significativa de carbonato de sodio en las áreas brillantes.
Esto representa el depósito de carbonato extraterrestre más concentrado encontrado en escalas de un kilómetro de ancho.
Otros compuestos detectados incluyen filosilicatos, carbonato de amonio o cloruro de amonio, mezclados con un componente oscuro.

Conclusiones:

Los compuestos identificados son endógenos, probablemente formados a partir de salmueras cristalizadas y sólidos alterados del interior de Ceres.
El calentamiento de impacto transitorio o las temperaturas sostenidas de la salmuera subterránea podrían explicar estas formaciones.
Los hallazgos sugieren la posibilidad de fluidos subsuperficiales existentes en Ceres.

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