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Criovulcanismo en Ceres

O Ruesch1, T Platz2, P Schenk3

  • 1NASA Goddard Space Flight Center/Universities Space Research Association (USRA), Greenbelt, MD, USA. ottaviano.ruesch@nasa.gov.

Science (New York, N.Y.)
|October 5, 2016
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Resumen
Este resumen es generado por máquina.

Los científicos descubrieron una cúpula criovolcánica viscosa en el planeta enano Ceres, lo que indica actividad geológica reciente. Este hallazgo sugiere que las sales con bajas temperaturas eutécticas pueden impulsar la evolución interna a largo plazo de Ceres.

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Área de la Ciencia:

  • Ciencias planetarias
  • Geología
  • Astrobiología

Sus antecedentes:

  • Los edificios volcánicos son comunes en los cuerpos rocosos del sistema solar interior.
  • Se conoce el criovulcanismo en el sistema solar exterior, pero sus expresiones superficiales (construcciones) rara vez se identifican.
  • El planeta enano Ceres es un objetivo clave para comprender los procesos geológicos del sistema solar exterior.

Objetivo del estudio:

  • Para identificar y caracterizar las formas de terreno criovolcánico en Ceres.
  • Para determinar la edad y la composición de las posibles características criovolcánicas.
  • Para entender las implicaciones de la actividad geológica reciente para la evolución de Ceres.

Principales métodos:

  • Análisis de imágenes de alta resolución de la cámara Dawn Framing.
  • Análisis geomorfológico para identificar estructuras en forma de cúpula.
  • Cálculo de cráteres de impacto para estimar las edades absolutas de las características de la superficie.
  • Análisis de composición basado en datos mineralógicos.

Principales resultados:

  • Descubrimiento de una forma de terreno interpretada como una cúpula criovolcánica viscosa en Ceres.
  • La evidencia sugiere que el material de origen de la cúpula es una mezcla de hielo de agua y minerales secundarios, incluidas las sales.
  • Las edades del modelo absoluto indican la extrusión reciente de la cúpula.
  • La presencia de esta cúpula implica una actividad interna reciente sostenida en Ceres.

Conclusiones:

  • Ceres exhibe actividad criovolcánica reciente, evidenciada por la cúpula descubierta.
  • El proceso criovolcánico probablemente involucra sales con bajas temperaturas eutécticas y conductividades térmicas.
  • Estas sales se proponen como factores clave para la evolución interna a largo plazo y la actividad de la superficie de Ceres.