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Pruebas isotópicas de rutenio para un origen interno del sistema solar de la chapa tardía
Mario Fischer-Gödde1, Thorsten Kleine1
1Institut für Planetologie, University of Münster, Wilhelm-Klemm-Strasse 10, 48149 Münster, Germany.
Nature
|January 28, 2017
Resumen
El manto de la Tierra contiene un "barniz tardío" de material meteorítico. El análisis de isótopos de rutenio revela que esta chapa no se originó en las condritas carbonáceas externas del Sistema Solar, refutando su papel como la fuente principal de agua y volátiles de la Tierra.
Área de la Ciencia:
- Geoquímica
- Cosmoquímica
- Ciencias planetarias
Sus antecedentes:
- El manto de la Tierra posee un exceso de elementos altamente siderófilos, atribuidos a una 'capilla tardía' de material meteorítico agregado después de la formación del núcleo.
- El origen de esta capa tardía (sistema solar interno vs. externo) es crucial para comprender la fuente de los volátiles y el agua de la Tierra.
Objetivo del estudio:
- Para investigar el origen de la capa tardía de la Tierra mediante el análisis de isótopos de rutenio (Ru).
- Para determinar si las condritas carbonáceas, fuentes potenciales de los volátiles de la Tierra, podrían ser la fuente de la capa tardía.
Principales métodos:
- Análisis de las composiciones de isótopos de rutenio (Ru) en diversas condritas, incluidas las condritas carbonáceas.
- Comparación de los datos del isótopo Ru con la composición isotópica conocida del manto de la Tierra.
Principales resultados:
- Todas las condritas analizadas, incluidas las condritas carbonáceas, exhiben composiciones de isótopos Ru distintas del manto de la Tierra.
- Se observó una clara tendencia al aumento de las anomalías de los isótopos Ru desde la enstatita hasta las condritas ordinarias y carbonáceas.
- Esta tendencia indica que los materiales formados a mayores distancias heliocéntricas poseen mayores anomalías de isótopos Ru.
Conclusiones:
- El estudio refuta un origen del Sistema Solar externo para la capa tardía de la Tierra.
- La capa tardía probablemente no fue la fuente principal de volátiles y agua en la Tierra, desafiando las hipótesis anteriores.
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