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El componente subducido en lavas de arco insular: restricciones de los isótopos de Be y de la sistemática B-Be
Nature
|March 1, 1990
Resumen
Las altas concentraciones de berilio-10 y boro indican contribuciones de placas de subducción. Los nuevos datos sugieren que el material de la losa es homogéneo y el boro no se almacena en el manto, lo que regula la generación de magma en la zona de subducción.
Área de la Ciencia:
- La geoquímica es la geoquímica.
- La geoquímica de los isótopos es la geoquímica de los isótopos.
- Petrología Petrología.
Sus antecedentes:
- Las placas subductoras son los principales contribuyentes a las fuentes de magma de arco.
- Los mecanismos exactos de la transferencia de material de losas de subducción a las fuentes de magma de arco siguen siendo objeto de debate.
- Las proporciones de isótopos de berilio-10 y boro son trazadores críticos para las contribuciones de subducción.
Objetivo del estudio:
- Para investigar los procesos de transferencia de material de las placas de subducción a las fuentes de magma de arco.
- Evaluar la homogeneidad de composición de las contribuciones de losas en diferentes arcos.
- Para determinar el destino del boro subducido dentro de la cuña del manto.
Principales métodos:
- Análisis de las proporciones de berilio-10/berilio (10Be/Be) en magmas de arco.
- Análisis de las proporciones de boro/berilio (B/Be) en las magmas de arco.
- Estudio comparativo en cuatro zonas de subducción distintas.
Principales resultados:
- La contribución de material derivado de barras es composicionalmente homogénea dentro de cada arco estudiado.
- El boro subducido no parece estar almacenado en el manto sub-arco.
- Los datos (10) Be/Be y B/Be proporcionan una imagen consistente de la influencia de la subducción.
Conclusiones:
- La transferencia de material de las placas de subducción a las fuentes de magma de arco es un proceso bien regulado.
- El boro subducido se incorpora eficientemente en los magmas de arco en lugar de acumularse en la cuña del manto.
- Los trazadores isotópicos como 10Be y B confirman un vínculo directo y homogéneo entre la subducción y el magmatismo de arco.
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