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Una zona de transición del manto delgado debajo de la cresta ecuatorial del Atlántico medio
Matthew R Agius1,2, Catherine A Rychert3, Nicholas Harmon3
1Ocean and Earth Science, University of Southampton, Southampton, UK. matthew.agius@soton.ac.uk.
Nature
|January 28, 2021
Resumen
Las crestas del medio océano facilitan la transferencia de material entre el manto superior e inferior de la Tierra, desafiando las suposiciones anteriores. Este descubrimiento sugiere que la convección de todo el manto es más significativa de lo que se entendía anteriormente, con las crestas jugando un papel clave.
Área de la Ciencia:
- La geofísica
- Sismología
- Ciencias de la Tierra
Sus antecedentes:
- La transferencia de material entre las capas del manto de la Tierra es crucial para su evolución.
- Las plumas de subducción y manto son sitios de transferencia conocidos, pero las crestas oceánicas no se consideraron significativas.
- Las mediciones directas en las cordilleras oceánicas son difíciles.
Objetivo del estudio:
- Investigar el papel de las cordilleras oceánicas en la transferencia de material del manto.
- Para obtener imágenes de las discontinuidades sísmicas que delimitan la zona de transición del manto debajo de la cresta del Atlántico Medio.
- Evaluar las implicaciones para la convección de todo el manto.
Principales métodos:
- Utilizó funciones de receptor para convertir las ondas sísmicas.
- Analizaron los datos sísmicos del fondo del océano de la cresta ecuatorial del Atlántico Medio.
- Discontinuidades sísmicas interpretadas a 410 km y 660 km de profundidad.
Principales resultados:
- Se observa la elevación de la discontinuidad de 660 km y la depresión de la discontinuidad de 410 km, lo que indica el adelgazamiento de la zona de transición del manto.
- Las velocidades de las ondas cortantes coincidentes sugieren material ascendente.
- Velocidades sísmicas más lentas debajo de la cresta del Atlántico Medio en comparación con el fondo marino más antiguo.
Conclusiones:
- Las crestas del medio océano son sitios de transferencia de material del manto inferior a superior.
- Esta transferencia puede ocurrir de forma continua o intermitente.
- El surgimiento de la cresta contribuye a la convección de todo el manto, equilibrando potencialmente el surgimiento de la losa.
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