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Intrusión de la corteza inferior en el margen continental del Atlántico Norte
R S White1, L K Smith, A W Roberts
1Bullard Laboratories, University of Cambridge, Madingley Road, Cambridge CB3 0EZ, UK.
Nature
|March 28, 2008
Resumen
El rifting continental produjo grandes volúmenes de fusión basáltica, la mayoría de las cuales se introdujeron en la corteza inferior como umbrales. El aumento de las temperaturas del manto, no la convección del manto, probablemente impulsó este magmatismo durante la ruptura continental.
Área de la Ciencia:
- La geofísica es la geofísica.
- La tectónica es la tectónica.
- Volcanología Volcanología.
Sus antecedentes:
- El rifting continental puede generar magmatismo significativo, pero los volúmenes de fusión y las causas siguen siendo objeto de debate.
- El papel de la temperatura del manto frente a otros factores en la conducción del magmatismo durante la ruptura no está claro.
Objetivo del estudio:
- Para cuantificar los volúmenes de fusión y comprender los mecanismos de emplazamiento en los márgenes de grietas volcánicas.
- Investigar los principales impulsores del magmatismo durante la ruptura continental.
Principales métodos:
- Adquisición y análisis de perfiles sísmicos de penetración profunda (incidencia normal y gran angular).
- Interpretación de datos sísmicos para mapear las intrusiones y extrusiones de fusión.
Principales resultados:
- Volúmenes cuantificados de extrusión de basalto (360-400 km3/km) e intrusión (540-600 km3/km) en los márgenes de Faroe y Hatton Bank.
- Se identificaron intrusiones de la corteza inferior como umbrales enfocados, no una "placa subterránea" continua.
- Los basaltos extrudidos se extienden a más de 100 km desde el eje de la grieta.
Conclusiones:
- La producción de fusión fue controlada principalmente por el aumento de las temperaturas del manto.
- No se requirió una convección activa significativa del manto ni la presencia de un manto fértil para explicar el magmatismo observado.
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