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Los límites de grano como depósitos de elementos incompatibles en el manto de la Tierra

Takehiko Hiraga¹, Ian M Anderson, David L Kohlstedt

¹Department of Geology and Geophysics, University of Minnesota, Minneapolis, Minnesota 55455, USA. hirag001@umn.edu

|February 20, 2004

Resumen

Los elementos incompatibles en el manto de la Tierra pueden almacenarse en los límites del grano olivino antes de la formación de fluidos. Este hallazgo explica cómo estos elementos se extraen selectivamente, impactando las firmas geoquímicas.

Área de la Ciencia:

La geoquímica es la geoquímica.
Física mineral Física de los minerales
La geodinámica es la geodinámica.

Sus antecedentes:

Comprender la partición de elementos en el interior de la Tierra es crucial para restringir los procesos geoquímicos y geodinámicos.
Una cuestión clave es el almacenamiento en fase pre-fluida de elementos incompatibles dentro de las rocas del manto.

Objetivo del estudio:

Para investigar la partición de los elementos, específicamente el calcio, entre el interior del grano y los límites del grano de olivino.
Para determinar si los límites de grano actúan como sitios de almacenamiento primario para elementos incompatibles antes de la formación de la fase fluida.

Principales métodos:

Utilizó un modelo termodinámico para la segregación de la frontera del grano de equilibrio.
Se analizaron agregados naturales y sintéticos ricos en olivina para estudiar la partición del calcio.

Principales resultados:

Se observó que la partición del calcio en el olivino sigue el modelo termodinámico para la segregación del límite del grano.
El modelo predice que los límites de los granos son sitios de almacenamiento primarios para los elementos de gran radio iónico (elementos incompatibles).

Conclusiones:

Los límites de grano en el olivino pueden ser los principales depósitos de elementos incompatibles en el manto de la Tierra.
Esto proporciona un mecanismo para la extracción selectiva de estos elementos y un marco para interpretar las firmas geoquímicas del manto.

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