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Investigaciones geofísicas de la frontera tectónica entre el este y el oeste de la Antártida
Science (New York, N.Y.)
|July 2, 1993
Resumen
Las montañas transantárticas.
Área de la Ciencia:
- La geofísica es la geofísica.
- La tectónica de placas es la tectónica de placas.
- Geología Geología Geología.
Sus antecedentes:
- Las Montañas Transantárticas (TAM) son las montañas más grandes adyacentes a un sistema de grietas.
- El origen de las montañas que bordean las grietas no se entiende bien.
- El rebote isostático es un mecanismo propuesto para la elevación y el hundimiento.
Objetivo del estudio:
- Para investigar la causa de la elevación de las montañas transantárticas.
- Para probar la hipótesis del rebote isostático.
- Para entender la estructura litosférica debajo del TAM.
Principales métodos:
- Se llevó a cabo un experimento sísmico de nieve excesiva en la Antártida.
- Se analizaron datos sísmicos para obtener imágenes de la estructura subterránea.
- Se utilizaron datos geofísicos para inferir las propiedades litosféricas.
Principales resultados:
- No se encontró evidencia de un canal de flanqueo al lado del TAM.
- Los datos sísmicos indican la presencia de la litosfera del manto rasgado que se extiende debajo del TAM.
- La evidencia geológica sugiere que el estiramiento de la corteza terrestre precedió a la elevación de las montañas.
Conclusiones:
- Es poco probable que el rebote isostático sea la causa principal de la elevación del TAM.
- La flotabilidad térmica debido a la litosfera extendida es una explicación más plausible para la elevación.
- Los hallazgos proporcionan nuevos conocimientos sobre la formación de cadenas montañosas relacionadas con las grietas.
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