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Las restricciones del isótopo de osmio en el reciclaje de metales de mineral en las zonas de subducción
1Commonwealth Scientific and Industrial Research Organization Exploration and Mining, Post Office Box 136, North Ryde, New South Wales 1670, Australia; Department of Earth Sciences, Monash University, Clayton, Victoria 3168, Australia;
Science (New York, N.Y.)
|October 16, 1999
Resumen
Las rocas del manto con venas debajo del depósito de oro de Ladolam muestran altas concentraciones de cobre, oro, platino y paladio. Estos metales probablemente se originaron en el manto, concentrados por procesos tectónicos.
Área de la Ciencia:
- La geoquímica es la geoquímica.
- Geología económica Geología económica.
- Petrología del manto Petrología del manto
Sus antecedentes:
- Los xenolitos de peridotita venosa se encuentran en el manto debajo del depósito de oro Ladolam, isla Lihir, Papúa Nueva Guinea.
- Estos xenolitos exhiben concentraciones significativamente más altas de cobre, oro, platino y paladio en comparación con el manto de arco agotado circundante.
Objetivo del estudio:
- Para investigar el origen de los metales en el depósito de oro de Ladolam.
- Comprender el papel del manto en la formación de depósitos de cobre y oro porfiro-epitermales.
Principales métodos:
- Análisis de elementos principales y oligoelementos en los xenolitos de peridotita.
- Análisis de isótopos de osmio en minerales de oro y peridotitas del manto.
Principales resultados:
- Los xenolitos de peridotita son de 2 a 800 veces más enriquecidos en Cu, Au, Pt y Pd en comparación con el manto ambiental.
- Las composiciones de isótopos de osmio de los minerales de oro coinciden con la fuente de peridotita del manto modificado por subducción.
- El manto es la principal fuente de metales para el depósito de Ladolam.
Conclusiones:
- El manto es la principal fuente de metales para el depósito de oro de Ladolam.
- Los procesos tectónicos que concentran metales solubles en líquidos son cruciales para la formación de depósitos epitermales de cobre y oro.
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