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El inicio y la migración de las cunas espirales en Marte reveladas por el radar orbital
1University of Texas Institute for Geophysics, Jackson School of Geosciences, Austin, Texas 78758, USA. isaac@ig.utexas.edu
Nature
|May 28, 2010
Resumen
Bajos en espiral en Marte.
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- Geología Geología Geología.
- Ciencias del clima Ciencias del clima Ciencias del clima
Sus antecedentes:
- Los depósitos en capas del Polo Norte (NPLD) de Marte cuentan con enigmáticos abismos espirales.
- El origen y la evolución de estos canales han sido objeto de debate desde su descubrimiento.
- Los datos anteriores de la superficie eran insuficientes para probar las hipótesis sobre la formación de depresiones.
Objetivo del estudio:
- Para investigar el origen y la migración de los pozos polares marcianos.
- Para poner a prueba las hipótesis con respecto a la formación (erosional frente a la construcción) y la edad de las depresiones.
- Para limitar los modelos paleoclimáticos utilizando nuevos datos sobre la evolución de las depresiones.
Principales métodos:
- Análisis de datos de estratigrafía de radar de los depósitos estratificados del Polo Norte.
- Iniciación de la datación del mínimo en relación con el depósito de NPLD.
- Cuantificación de las tasas bajas de migración y los cambios en la altitud.
Principales resultados:
- Bajas en espiral centrales iniciadas después de la deposición del 75% del NPLD.
- Las zanjas alcanzaron una morfología estable y migraron ~65 km hacia los polos y 600 m hacia arriba durante ~2 millones de años.
- La estratigrafía de radar refuta la incisión erosional post-deposición, lo que apoya la migración por el canal constructivo.
Conclusiones:
- Los pozos polares marcianos son principalmente características constructivas formadas por el viento y la deposición.
- La migración a través de las zanjas proporciona restricciones para los modelos de paleoclima marciano.
- Comprender la evolución de la depresión ayuda a determinar la edad de los depósitos polares y los vínculos climático-orbitales.
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