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Procesos estructurales en las crestas de expansión lenta
Science (New York, N.Y.)
|July 31, 1992
Resumen
Las crestas de extensión lenta en el medio del océano exhiben depresiones con grietas, a diferencia de las crestas de extensión rápida.
Área de la Ciencia:
- Geofísica y tectónica.
- Geología marina Geología marina.
- La tectónica de placas es la tectónica de placas.
Sus antecedentes:
- Las crestas oceánicas medias (MORs) exhiben características distintas basadas en la velocidad de propagación.
- Las MOR de propagación lenta (<35 mm/año) se caracterizan por depresiones y asimetría de grietas.
- Las MOR de rápida propagación presentan estructuras volcánicas simétricas.
Objetivo del estudio:
- Para investigar los procesos contrastantes de formación de la corteza en las crestas oceánicas de expansión lenta y rápida.
- Determinar el papel de la deformación mecánica frente a los procesos magmáticos en la segmentación de las crestas.
Principales métodos:
- Análisis de los datos de imágenes sísmicas de las lentas crestas oceánicas de expansión media.
- Comparación de las características geológicas (fallas, terremotos, exposiciones de roca) entre las crestas de expansión lenta y rápida.
Principales resultados:
- Las crestas de expansión lenta muestran deformaciones mecánicas significativas, evidenciadas por terremotos profundos, grandes fallas normales y rocas de la corteza inferior expuestas.
- La segmentación en las crestas de expansión lenta está vinculada a procesos deformacionales, no principalmente magmáticos.
- Las crestas que se extienden rápidamente muestran estructuras volcánicas simétricas y elevadas.
Conclusiones:
- La deformación mecánica juega un papel más crítico en la formación de la corteza en las crestas de extensión lenta en comparación con las crestas de extensión rápida.
- La segmentación de las crestas de expansión lenta está intrínsecamente ligada al proceso de deformación.
- La comprensión de la segmentación de la cresta es clave para comprender la evolución de MOR.
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