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Pruebas geofísicas de la zona MELT para controles de composición en placas oceánicas
Rob L Evans1, Greg Hirth, Kiyoshi Baba
1Department of Geology and Geophysics, Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543, USA. revans@whoi.edu
Nature
|September 9, 2005
Resumen
El experimento MELT revela que la distribución del derretimiento debajo de la elevación del Pacífico Este está influenciada por la disminución del contenido de agua, no solo por el enfriamiento. Esto impacta en la evolución temprana de la litosfera oceánica.
Área de la Ciencia:
- La geofísica es la geofísica.
- Oceanografía La oceanografía es la oceanografía.
- Ciencias de la Tierra Sólida Ciencias de la Tierra Sólida
Sus antecedentes:
- El East Pacific Rise es un sitio clave para estudiar los procesos de la cresta del océano medio.
- La comprensión de la evolución de la litosfera oceánica requiere el conocimiento de la distribución de la fusión y las propiedades físicas.
Objetivo del estudio:
- Para restringir la distribución del derretimiento debajo de la elevación del sur del Pacífico Oriental.
- Para investigar la historia temprana del enfriamiento y la evolución de la litosfera oceánica.
Principales métodos:
- Se utilizaron datos magnetotellúricos y sísmicos del experimento MELT.
- Las estructuras analizadas se encuentran aproximadamente a 100 a 350 km al este de la cresta de la cresta (1.3 4.5 Myr edades del fondo marino).
Principales resultados:
- Se observó un aumento significativo en la conductividad eléctrica por debajo de 60 km de profundidad.
- Se detectó una transición de la estructura eléctrica isotrópica a la anisotrópica transversalmente.
- Se encontró que la estructura es en gran medida independiente de la edad en la región estudiada.
Conclusiones:
- Inferido que la disminución del contenido de agua por encima de 60 km, debido a la fusión, controla la estructura de la placa oceánica joven.
- Esto contrasta con las predicciones de los modelos de refrigeración conductiva.
- Los hallazgos proporcionan información sobre los procesos magmáticos e hidrotermales en las cordilleras oceánicas medias.
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