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Un cinturón de manto suboceánico frío en el ecuador de la Tierra
Science (New York, N.Y.)
|July 16, 1993
Resumen
La Tierra La Tierra La Tierra La Tierra La Tierra
Área de la Ciencia:
- Geofísica y geoquímica.
- Oceanografía La oceanografía es la oceanografía.
- Física de los minerales Física de los minerales
Sus antecedentes:
- Las crestas del océano medio proporcionan información sobre los procesos del manto superior.
- La composición química de las rocas derivadas del manto revela variaciones térmicas y de composición.
Objetivo del estudio:
- Investigar el estado térmico del manto superior debajo del Atlántico ecuatorial.
- Determinar la composición y la densidad del manto superior ecuatorial.
- Explorar la influencia de la rotación de la Tierra en la dinámica del manto.
Principales métodos:
- Análisis de la composición química de las peridotitas y basaltos de la cresta medio-oceánica derivados del manto.
- Interpretación de los datos de la gravedad.
- Comparación con los datos de elevación de la corteza terrestre de la elevación del Pacífico Este.
Principales resultados:
- Excepcionalmente bajo grado de fusión del manto superior en el Atlántico ecuatorial.
- Las temperaturas del manto son al menos 150 ° C más frías que las normales de la cordillera del Atlántico medio.
- Evidencia de isotermas deprimidas y manto descendente en el Atlántico ecuatorial.
- Se sugirió una anomalía térmica ecuatorial similar para el Pacífico.
- Los datos de gravedad indican alta densidad, frío y material del manto superior no agotado.
- Un cinturón frío ecuatorial puede separar distintos dominios del manto del hemisferio norte y sur.
Conclusiones:
- Existe un cinturón ecuatorial frío del manto superior oceánico, potencialmente influenciado por la rotación de la Tierra.
- Este cinturón frío se caracteriza por un descenso, isotermas deprimidas y una composición de manto no agotada.
- Los hallazgos sugieren un patrón global de enfriamiento del manto ecuatorial que afecta las propiedades de la corteza oceánica y los dominios del manto.
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