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Sensibilidad de la batimetría del fondo marino a las fluctuaciones provocadas por el clima en el suministro de magma
1Lamont-Doherty Earth Observatory, Columbia University, Palisades NY, USA. jaolive@ldeo.columbia.edu.
Science (New York, N.Y.)
|October 17, 2015
Resumen
La batimetría del fondo marino revela cambios lentos, no rápidos, en el suministro de magma de la cresta oceánica media. Nuestros modelos muestran que los procesos del fondo marino filtran las fluctuaciones de magma a corto plazo, proporcionando información sobre la Tierra
Área de la Ciencia:
- Geofísica y tectónica
- Geología marina y geodinámica
Sus antecedentes:
- Investigaciones anteriores sugirieron que la batimetría de la cresta del océano medio registra fluctuaciones rápidas (23100 kyr) en el suministro de magma relacionadas con los cambios en el nivel del mar.
- Se pensó que estas fluctuaciones modulaban la producción de derretimiento del manto e influían en la topografía del fondo marino.
Objetivo del estudio:
- Investigar la relación entre las variaciones del suministro de magma y el tejido batimétrico del fondo marino en las cordilleras oceánicas medias.
- Determinar la capacidad de filtrado de los procesos de formación del fondo marino en las fluctuaciones del suministro de magma.
- Para explicar la correlación observada entre la velocidad de propagación y la longitud de onda del fondo marino.
Principales métodos:
- Se utilizaron modelos cuantitativos de fallas y emplazamiento de magma.
- Procesos simulados de formación del fondo marino para evaluar su efecto en las variaciones del suministro de magma.
- Comparó las predicciones del modelo con datos empíricos sobre longitudes de onda del fondo marino y tasas de propagación.
Principales resultados:
- Demostró que los procesos de formación del fondo marino actúan como un filtro de paso bajo, amortiguando significativamente las fluctuaciones del suministro de magma más cortas que aproximadamente 100.000 años.
- Se demostró que la disminución observada en las longitudes de onda dominantes del fondo marino con una tasa de propagación creciente es consistente con un modelo de entrada constante de magma.
- Se encontró que las variaciones rápidas de suministro de magma no se registran de manera confiable en el tejido batimétrico.
Conclusiones:
- La topografía del fondo marino refleja principalmente variaciones a largo plazo (> 100 kyr) en el suministro de magma, no fluctuaciones rápidas.
- Un modelo de crecimiento de fallas y abandono bajo entrada constante de magma explica robustamente los patrones de tejido del fondo marino.
- Esto proporciona un marco para interpretar los procesos de fusión del manto a partir de la estructura de las colinas abismales.
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