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Un presupuesto para el crecimiento continental y la desnudación
Science (New York, N.Y.)
|July 25, 1986
Resumen
La corteza oceánica global se recicla cada 110 millones de años. Las tasas de acreción continental pueden alcanzar los 3,0 kilómetros cúbicos por año, aumentando potencialmente la masa continental en 1,35 kilómetros cúbicos anuales.
Área de la Ciencia:
- Geología Geología Geología.
- La geofísica es la geofísica.
- Oceanografía La oceanografía es la oceanografía.
Sus antecedentes:
- La corteza oceánica se genera y recicla continuamente.
- Los procesos de sedimentación juegan un papel crucial en la transferencia de material a las zonas de subducción.
Objetivo del estudio:
- Para cuantificar las tasas de formación de material siálico y acumulación de sedimentos.
- Para estimar la acreción continental y las tasas de crecimiento neto basadas en procesos de subducción.
Principales métodos:
- Análisis del material de la corteza oceánica global.
- Estimación de las tasas de afluencia de sedimentos (terrígenos y biogénicos).
- Modelado de la transferencia de material en las zonas de subducción.
Principales resultados:
- La tasa de formación de material siálico potencial es de 1,35 km3/año.
- La acumulación de sedimentos volcánicos hemipelágicos: 0,05 km3/año.
- Flujo de sedimentos terrígenos y biogénicos: 1,65 km3/año.
- Tasa de acreción continental estimada: hasta 3,0 km3/año.
- Crecimiento continental neto potencial: 1,35 km3 por año.
Conclusiones:
- Las zonas de subducción son sitios importantes para el crecimiento continental.
- La afluencia de sedimentos y el reciclaje de la corteza contribuyen a la acreción continental.
- Los continentes de la Tierra exhiben una tasa de crecimiento neto debido a estos procesos geológicos.
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