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Fraccionamiento de los elementos del grupo del platino durante la fusión del manto
Conny Bockrath1, Chris Ballhaus, Astrid Holzheid
1Institut für Mineralogie, Universität Münster, Corrensstrasse 24, 48149 Münster, Germany. bockrat@nwz.uni-muenster.de
Science (New York, N.Y.)
|September 28, 2004
Resumen
Existen dos fases estables de sulfuro en el manto superior de la astenosfera: un monosulfuro y un sulfuro fundido. Estas fases controlan la distribución de metales nobles en el manto residual y los componentes basálticos, respectivamente.
Área de la Ciencia:
- La geoquímica es la geoquímica.
- Petrología Petrología.
- Física de los minerales Física de los minerales
Sus antecedentes:
- La composición y el comportamiento de las fases de sulfuro en el manto superior son cruciales para comprender el ciclo de los metales nobles (elementos del grupo del platino).
- Estudios anteriores no han aclarado completamente los roles distintos de las diferentes fases de sulfuro durante la fusión del manto y la segregación del fundido.
Objetivo del estudio:
- Investigar la estabilidad y partición de las fases de sulfuro en sistemas de sulfuro-silicato en condiciones del manto superior.
- Para determinar cómo estas fases de sulfuro influyen en el contenido de metales nobles del manto residual y la segregación de silicatos fundidos.
Principales métodos:
- Petrología experimental utilizando sistemas de sulfuro-silicato.
- Análisis de las composiciones de fase y separación de metales nobles.
Principales resultados:
- Dos fases de sulfuro distintas son estables: un monosulfuro cristalino enriquecido en Os, Ir y Ru, y un sulfuro fundido enriquecido en Rh, Pt y Pd.
- El monosulfuro permanece en el residuo sólido durante la segregación del fundido de silicato, controlando la firma de metal noble del manto residual.
- La fusión de sulfuro se incorpora como gotas en la fusión de silicato, definiendo el inventario de metales nobles de los magmas basálticos.
Conclusiones:
- El comportamiento distinto de las fases de fusión de monosulfuro y sulfuro conduce a una clara partición de metales nobles entre el manto residual y los magmas.
- Esta comprensión es fundamental para rastrear los procesos del manto y el origen de los PGE en los depósitos de mineral magmático.
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