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La verdadera deambulación polar en Europa proviene de depresiones de círculos pequeños a escala global
Paul Schenk1, Isamu Matsuyama, Francis Nimmo
1Lunar and Planetary Institute, Houston, Texas 77058, USA. schenk@lpi.usra.edu
Nature
|May 16, 2008
Resumen
Las complejas características tectónicas de Europa pueden explicarse por la verdadera migración polar. Este proceso geológico, que involucra la reorientación de las capas de hielo, probablemente creó las depresiones y depresiones arqueadas observadas en Europa.
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- Geología Geología Geología.
- La geofísica es la geofísica.
Sus antecedentes:
- Europa exhibe patrones tectónicos complejos y una historia de estrés, con muchas características a gran escala que permanecen sin explicación.
- Se ha propuesto el true polar wander (TPW) para explicar algunas características si la capa de hielo de Europa es latitudinalmente variable y desacoplada de su interior.
Objetivo del estudio:
- Para investigar el origen de inexplicables arcos y depresiones arqueadas en Europa.
- Para determinar si la verdadera divagación polar puede explicar las características tectónicas observadas a escala global.
Principales métodos:
- Análisis de datos de imágenes de tres misiones de naves espaciales a Europa.
- Mapeo a escala global de las depresiones y depresiones arqueadas.
- Comparación de las características observadas con los patrones de estrés predichos por los modelos de true polar wander.
Principales resultados:
- Se mapearon dos conjuntos concéntricos y antipodales a escala global de valles y depresiones arqueadas.
- Estas características, de hasta cientos de kilómetros de largo y 0,3 1,5 km de profundidad, muestran una excelente coincidencia con las tensiones de un episodio de ~ 80 grados de verdadero paseo polar.
- Las depresiones parecen estar geográficamente relacionadas con otros lineamientos a gran escala.
Conclusiones:
- La verdadera divagante polar proporciona una explicación convincente para los bajos y depresiones arqueadas observadas en Europa.
- Muchos de los patrones tectónicos de Europa pueden estar vinculados a episodios de verdadera migración polar.
- Este mecanismo ofrece una explicación unificada para características geológicas previamente inexplicables.
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