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Infiltración difusiva rápida de sodio en el peridotito parcialmente fundido
1Department of Geological Sciences, Brown University, Providence, Rhode Island 02912, USA. lundstro@uiuc.edu
Nature
|February 17, 2000
Resumen
La difusión de sodio en las fusiones basálticas ascendentes influye en la dinámica de fusión de la peridotita. Esta interacción explica las inclusiones ricas en sílice y los modos de fusión anómalos sin requerir temperaturas más altas del manto.
Área de la Ciencia:
- La geoquímica es la geoquímica.
- Petrología Petrología.
- Sismología Sismología Sismología.
Sus antecedentes:
- El derretimiento del manto produce líquido basáltico que forma una red interconectada, lo que lleva a un rápido ascenso.
- La fusión del manto es un proceso polibárico, con fundidos formados a diferentes presiones que tienen distintas composiciones químicas.
- Los modelos actuales a menudo asumen que no hay interacción entre los fundidos de presiones más profundas y el manto sólido superpuesto.
Objetivo del estudio:
- Para investigar la interacción entre las fusiones ascendentes y el manto sólido circundante a presiones más bajas.
- Para explicar las observaciones geoquímicas, como las inclusiones de vidrio rico en sílice en los xenolitos y la fusión anómala en las peridotitas abismales.
- Proponer un mecanismo para aumentar el derretimiento de la litosfera y el surgimiento de la astenosfera.
Principales métodos:
- Análisis de recientes observaciones sismológicas, geoquímicas y experimentales.
- Modelado de los procesos de fusión del manto polibárico.
- Investigación de la dinámica de difusión del sodio en fundidos ascendentes.
Principales resultados:
- El sodio en fundidos ascendentes se difunde rápidamente en fundidos a baja presión dentro de la matriz de peridotita.
- Este proceso de difusión altera la forma en que se derrite la peridotita.
- El mecanismo propuesto explica las inclusiones de vidrio rico en sílice y los modos de fusión anómalos en las peridotitas abismales.
Conclusiones:
- La interacción fusión-peridotita a través de la difusión de sodio es un proceso clave en la fusión del manto.
- Este proceso puede explicar las anomalías geoquímicas observadas sin invocar temperaturas más altas del manto.
- Proporciona un mecanismo para aumentar el derretimiento de la litosfera y el surgimiento de la astenosfera.
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