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Simulation of the Planetary Interior Differentiation Processes in the Laboratory
Published on: November 15, 2013
El derretimiento en el manto superior profundo de la Tierra causado por el dióxido de carbono
Rajdeep Dasgupta1, Marc M Hirschmann
1Department of Geology and Geophysics, University of Minnesota, 310 Pillsbury Drive SE, Minneapolis, Minnesota 55455, USA. dasg0007@umn.edu
Nature
|March 31, 2006
Resumen
El derretimiento parcial debajo de las cordilleras oceánicas medias, impulsado por la peridotita carbonatada, se produce a mayor profundidad de lo que se pensaba. Este proceso influye en el ciclo de los elementos y en las propiedades del manto, impactando en la Tierra.
Área de la Ciencia:
- La geoquímica es la geoquímica.
- La geofísica es la geofísica.
- Petrología Petrología.
Sus antecedentes:
- El derretimiento parcial debajo de las crestas oceánicas medias es crucial para el ciclo de los elementos de la corteza del manto y la reología del manto.
- Los datos geofísicos sugieren que el derretimiento comienza a una profundidad de unos 300 km, pero la causa sigue siendo incierta.
Objetivo del estudio:
- Para investigar el sólido de la peridotita carbonatada a altas presiones (3-10 GPa).
- Para determinar la profundidad y la extensión de la fusión debajo de las crestas oceánicas medias.
- Para explicar las observaciones geofísicas relacionadas con el derretimiento profundo del manto.
Principales métodos:
- Determinación experimental de la peridotita carbonizada sólida.
- Modelado termodinámico de los procesos de fusión.
- Integración de datos experimentales con observaciones geofísicas.
Principales resultados:
- El derretimiento debajo de las cordilleras del océano medio puede ocurrir a una profundidad de hasta 330 km.
- Esta fusión profunda produce pequeñas cantidades (0,03-0,3%) de líquido de carbonatita.
- Estos derretimientos probablemente causan la recristalización de minerales, lo que explica las anomalías geofísicas.
Conclusiones:
- El derretimiento profundo del manto de la peridotita carbonatada es un proceso significativo debajo de las cordilleras oceánicas medias.
- Este proceso recicla eficientemente el carbono, el helio, el argón y los elementos productores de calor del manto profundo.
- Crea un residuo de manto agotado e influye en la composición y reología del manto superior.
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