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La influencia de la migración de las crestas en la segmentación magmática de las crestas oceánicas medias

S M Carbotte¹, C Small, K Donnelly

¹Lamont-Doherty Earth Observatory, 61 Rte 9W, Palisades, New York 10964, USA. carbotte@ldeo.columbia.edu

|June 18, 2004

Resumen

Los cambios en la profundidad y la forma de la cresta del océano medio están vinculados a las variaciones en el suministro de magma. La velocidad de migración de la cresta sobre el manto influye directamente en la segmentación magmática, explicando la morfología de la cresta.

Área de la Ciencia:

Geología Geología Geología.
La geofísica es la geofísica.
La tectónica es la tectónica.

Sus antecedentes:

Las cordilleras oceánicas exhiben variaciones sistemáticas de profundidad y forma, formando segmentos delimitados por fallas.
Estos cambios morfológicos están relacionados con el suministro de magma del manto, pero la causa no está clara.

Objetivo del estudio:

Para investigar la relación entre la morfología de la cresta del océano medio y los procesos del manto.
Para determinar la influencia de la migración de las crestas en la segmentación magmática.

Principales métodos:

Análisis de más de 9.500 km de datos de la cresta del océano medio.
Examen de la morfología del segmento de cresta en el marco de referencia del "punto caliente".

Principales resultados:

La segmentación magmática de las crestas de extensión rápida e intermedia se correlaciona con la velocidad de migración del eje de extensión.
Los segmentos principales de la cresta en el marco del punto caliente se alinean con segmentos poco profundos y magmáticamente robustos en la mayoría de las discontinuidades.

Conclusiones:

La migración de la cresta impulsa el surgimiento asimétrico del manto y la producción de fusión enfocada, creando segmentación magmática.
Este mecanismo explica las variaciones en la estructura de la corteza y la distribución del derretimiento a lo largo de las cordilleras oceánicas.

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