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Simulation of the Planetary Interior Differentiation Processes in the Laboratory
Published on: November 15, 2013
La pérdida de helio, la tectónica y el presupuesto de calor terrestre
Resumen
El helio primordial escapa del manto de la Tierra a través de la corteza oceánica y continental, con desgasificación subcontinental vinculada a la extensión activa de la corteza. Este proceso desafía los modelos actuales del equilibrio de calor y helio de la Tierra.
Área de la Ciencia:
- La geoquímica es la geoquímica.
- La geofísica es la geofísica.
- Ciencias de la Tierra Ciencias de la Tierra Ciencias de la Tierra
Sus antecedentes:
- El helio primordial, atrapado desde la formación de la Tierra, se desgasea a través de la nueva corteza oceánica.
- Contrariamente a las expectativas, la desgasificación significativa de helio también ocurre a través de la corteza continental.
Objetivo del estudio:
- Para investigar el poco entendido proceso subcontinental de desgasificación de helio.
- Para conciliar las tasas observadas de pérdida de calor del manto con la pérdida de helio.
Principales métodos:
- Análisis de los volátiles del manto que escapan a través de la corteza continental, particularmente en Europa Occidental.
- Comparación de las tasas de pérdida de helio con la producción de calor radiogénico a partir del uranio y el torio.
Principales resultados:
- El escape volátil del manto en Europa occidental está asociado con la extensión activa de la corteza.
- La tasa actual de pérdida de calor del manto es significativamente mayor que la tasa de pérdida de helio (factor de ~20).
Conclusiones:
- La desgasificación del helio subcontinental es un proceso significativo, que ocurre donde la corteza se está extendiendo activamente.
- Las discrepancias en las tasas de pérdida de calor y helio sugieren una acumulación de helio en el manto o errores en los modelos de la química masiva de la Tierra y las fuentes de calor.
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