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El rifting antártico oriental desencadena la elevación de las montañas Gamburtsev
Fausto Ferraccioli1, Carol A Finn, Tom A Jordan
1British Antarctic Survey, High Cross, Madingley Road, Cambridge, CB3 0ET, UK. ffe@bas.ac.uk
Nature
|November 19, 2011
Resumen
Las montañas subglaciales Gamburtsev.
Área de la Ciencia:
- La geofísica es la geofísica.
- La tectónica es la tectónica.
- Geología Geología Geología.
Sus antecedentes:
- Las montañas subglaciales Gamburtsev están ocultas debajo de la capa de hielo de la Antártida Oriental.
- Su gran elevación y la topografía alpina presentan una paradoja, ya que su origen se entiende mal.
Objetivo del estudio:
- Para investigar la arquitectura de la corteza y los mecanismos de elevación de las montañas subglaciales Gamburtsev.
- Para explicar la paradoja de su topografía alpina preservada bajo la capa de hielo de la Antártida Oriental.
Principales métodos:
- Se utilizaron datos geofísicos, incluidas las exploraciones de radar, gravedad y magnetismo.
- Desarrolló modelos para explicar la elevación y el relieve de las montañas.
Principales resultados:
- Identificó un sistema de grietas de 2.500 kilómetros de largo que rodea el Gamburtsevs.
- Reveló una gruesa raíz de corteza debajo de las montañas, formada durante el Proterozoico y rejuvenecida por sucesos posteriores de fisuras.
- Modelado cómo la elevación de los flancos de las grietas, la flotabilidad de las raíces y la erosión contribuyen a la topografía de las montañas.
Conclusiones:
- La topografía de las montañas Gamburtsev se explica por una combinación de procesos de rifting y una raíz orogénica preservada.
- Rifting y antiguas raíces orogénicas pueden crear alta topografía en interiores continentales sin extensa modificación litosférica.
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