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Heterogeneidades químicas de corta duración en el manto arqueo con implicaciones para la convección del manto
Science (New York, N.Y.)
|March 18, 1994
Resumen
La convección del manto arcaico fue más rápida, lo que condujo a heterogeneidades químicas de menor duración en comparación con la actual. Esto sugiere la Tierra temprana.
Área de la Ciencia:
- La geoquímica es la geoquímica.
- La geofísica es la geofísica.
- Ciencias de la Tierra Temprana Ciencias de la Tierra Temprana.
Sus antecedentes:
- La dinámica del manto arqueo y la heterogeneidad química son poco conocidas.
- Se debate el papel de la tectónica de placas en la Tierra temprana.
Objetivo del estudio:
- Para investigar el tiempo de vida de las heterogeneidades químicas en el manto arqueo.
- Para comparar la convección del manto arcaico con la dinámica moderna del manto.
Principales métodos:
- Análisis de la sistemática de isótopos de neodimio y samario-neodimio en magmas derivados del manto de hace 2.700 millones de años.
Principales resultados:
- Las heterogeneidades químicas en el manto arqueo tuvieron una vida útil significativamente más corta que en el manto moderno.
- Los datos isotópicos sugieren números de Rayleigh mucho más altos y una convección más rápida en el manto del Arcaico Tardío.
- La migración de magma y los cambios de fase, en lugar del reciclaje de la corteza, probablemente crearon heterogeneidades en el manto arcaico.
Conclusiones:
- La tectónica de placas moderna es un análogo poco probable para los procesos del manto arcaico.
- La convección del manto arqueo fue probablemente mucho más vigorosa de lo que se pensaba anteriormente.
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