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Published on: October 25, 2019
Eclogitas, geotermia de piroxeno y capa de convección del manto en capas
Resumen
Las temperaturas de los xenolitos de eclogita sugieren que el manto de la Tierra tiene capas de convección. Esta geotermia indica una capa límite convectiva debajo de la placa litosférica, que difiere de los modelos de convección del manto entero.
Área de la Ciencia:
- La geoquímica es la geoquímica.
- La geofísica es la geofísica.
- Petrología Petrología.
Sus antecedentes:
- Los xenolitos eclogitas proporcionan información sobre las condiciones del manto de la Tierra.
- Las geotermías subcontinentales son cruciales para comprender la dinámica de las placas litosféricas.
Objetivo del estudio:
- Para determinar las temperaturas de equilibrio de los xenolitos de eclogita de la tubería de kimberlita Roberts Victor.
- Para interpretar la geotermia subcontinental y sus implicaciones para la convección del manto.
Principales métodos:
- Análisis de las composiciones minerales de los xenolitos de eclogita.
- Modelado geotérmico basado en temperaturas de equilibrio de xenolitos.
Principales resultados:
- El 81% de los xenolitos de eclogita se equilibraron entre 1000 y 1250°C.
- Estas temperaturas se alinean con la extremidad inferior de una geotermia subcontinental flexionada derivada de los xenólitos de peridotita de granate.
- El gradiente de inflexión de la geotermia sugiere una doble capa térmica límite.
Conclusiones:
- La geotermia flexionada probablemente representa la capa límite convectiva debajo de la placa litosférica.
- Los datos apoyan un modelo de convección del manto en capas en lugar de convección del manto entero.
- Las eclogitas arcaicas proporcionan evidencia de los antiguos procesos del manto.
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