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Un origen de impactador para las anomalías magnéticas lunares
Mark A Wieczorek1, Benjamin P Weiss, Sarah T Stewart
1Institut de Physique du Globe de Paris, Université Paris Diderot, 94100 Saint-Maur des Fossés, France. wieczor@ipgp.fr
Science (New York, N.Y.)
|March 10, 2012
Resumen
Las anomalías magnéticas de la Luna pueden originarse en materiales altamente magnéticos expulsados por el impacto que formó la cuenca del Polo Sur-Aitken. Este material de proyectil, magnetizado en un campo de dínamo del núcleo lunar, explica las anomalías a través de la superficie lunar.
Área de la Ciencia:
- Geología lunar geología lunar.
- El magnetismo planetario es el magnetismo planetario.
- Los cráteres de impacto se han formado.
Sus antecedentes:
- La Luna exhibe anomalías magnéticas significativas a pesar de que sus rocas tienen un magnetismo débil.
- El origen de estas anomalías magnéticas lunares sigue siendo poco comprendido.
Objetivo del estudio:
- Para investigar la hipótesis de que los materiales extralunar de un evento de impacto mayor son responsables de las anomalías magnéticas lunares.
- Para determinar si los materiales del impactador pueden explicar la distribución y la intensidad de las anomalías magnéticas observadas.
Principales métodos:
- Utilizando el modelado de impacto para simular la distribución de los materiales de proyectil de un impacto oblicuo.
- Comparando la distribución modelada de las eyecciones con los mapas de anomalías magnéticas existentes de la Luna.
- Analizando las propiedades magnéticas de materiales extralunar potenciales y su magnetización dentro de un campo de dinamo central.
Principales resultados:
- La distribución de los materiales de proyectil modelados de un impacto oblicuo se alinea con las anomalías magnéticas que rodean la cuenca del Polo Sur-Aitken.
- Las propiedades magnéticas de estos materiales extralunar, cuando se magnetizan en un campo de dinamo central, pueden explicar las intensidades de anomalías observadas.
- Las eyecciones distales de este evento de impacto pueden explicar anomalías magnéticas aisladas ubicadas lejos de la cuenca.
Conclusiones:
- Las anomalías magnéticas lunares más prominentes son probablemente causadas por materiales extralunar altamente magnéticos.
- El evento de impacto que formó la cuenca del Polo Sur-Aitken es una fuente plausible para estas anomalías magnéticas.
- Este hallazgo proporciona una nueva explicación para el magnetismo lunar y la dinámica de impacto.
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