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La fusión de las placas como barrera a la subducción profunda de carbono
Andrew R Thomson1,2, Michael J Walter1, Simon C Kohn1
1School of Earth Sciences, University of Bristol, Bristol BS8 1RJ, UK.
Nature
|January 8, 2016
Resumen
La subducción de la corteza oceánica forma una barrera profunda de carbono, impidiendo el reciclaje directo en el manto. Esta barrera influye en los ciclos de carbono del manto y la formación de diamantes a través de reacciones con fundidos.
Área de la Ciencia:
- Geoquímica
- Minerología
- La geofísica
Sus antecedentes:
- El ciclo de los elementos volátiles entre la corteza, el manto y la atmósfera es crucial para la habitabilidad planetaria.
- La subducción de la corteza oceánica repone los depósitos volátiles del manto, mientras que el vulcanismo los libera a la superficie.
- Los diamantes superprofundos contienen inclusiones minerales que sugieren orígenes relacionados con la corteza oceánica subducida.
Objetivo del estudio:
- Para investigar el destino de la corteza oceánica carbonatada durante la subducción.
- Comprender las implicaciones para los depósitos de carbono del manto y la génesis del diamante.
- Identificar las barreras potenciales para el reciclaje de carbono en el manto profundo.
Principales métodos:
- Modelado geoquímico de las placas geotérmicas y las curvas de fusión.
- Análisis de las inclusiones minerales en diamantes superprofundos.
- Cálculos termodinámicos de las interacciones entre la fusión y la peridotita.
Principales resultados:
- Las geotérmicas de losas cruzan una depresión de curva de fusión para la corteza oceánica carbonatada a 300-700 km de profundidad.
- Esto crea una barrera para dirigir el reciclaje de carbonato en el manto profundo.
- Los fundidos de carbonatita alcalina de bajo grado reaccionan con la peridotita del manto, formando diamantes y explicando las inclusiones de diamantes súper profundas.
Conclusiones:
- Una barrera de carbono profunda tiene un impacto significativo en el reciclaje de carbono del manto.
- Esta barrera contribuye a la heterogeneidad química e isotópica del manto.
- Comprender esta barrera es clave para comprender los ciclos volátiles de la Tierra y la formación de diamantes.
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