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Estroncio-87 huérfano en peridotitas abisales: papá fue un granito
Resumen
Las altas proporciones de isótopos de estroncio en las peridotitas sugieren un componente "huérfano" del estroncio-87. Este componente proviene de la infiltración de agua de mar a baja temperatura que lleva arcillas detrital, no de la desintegración radiactiva dentro del manto.
Área de la Ciencia:
- La geoquímica es la geoquímica.
- Geología de Isótopos Geología de Isótopos.
- Oceanografía La oceanografía es la oceanografía.
Sus antecedentes:
- Las proporciones elevadas de isótopos de estroncio ((87) Sr / ((86) Sr) en peridotitas abisales y alpinas exceden las esperadas de una simple mezcla de manto con agua de mar.
- La presencia de exceso, o "huérfano", (87) Sr, aparentemente desacoplado de su progenitor radiactivo, a menudo se atribuía a errores analíticos.
Objetivo del estudio:
- Investigar el origen y la ubicación del "huérfano" (87) Sr en muestras de peridotita.
- Determinar el mecanismo responsable de la introducción de estroncio radiogénico en la corteza oceánica.
Principales métodos:
- Análisis de muestras masivas de peridotita abisal y alpina.
- Examen microscópico y químico de los productos de alteración de la peridotita, centrándose específicamente en la olivina y la enstatita.
- Análisis isotópico del estroncio en componentes identificados.
Principales resultados:
- El componente "huérfano" (87) Sr está localizado dentro de los productos de alteración de la olivina y la enstatita en las peridotitas abismales.
- La evidencia sugiere la introducción a través de la infiltración de agua de mar a baja temperatura (<200 ° C).
- Las partículas detritales asociadas, incluidas las arcillas de origen continental, son altamente radiogénicas.
Conclusiones:
- El "huérfano" (87) Sr en peridotitas no es un artefacto analítico sino el resultado de una alteración inducida por el agua de mar.
- La infiltración de agua de mar de baja temperatura que lleva material detrital radiogénico es la fuente principal de este exceso de estroncio.
- Los isótopos radiogénicos como el "huérfano" (87) Sr pueden servir como trazadores valiosos para la penetración del agua de mar a baja temperatura en la corteza oceánica.
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