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Restos del sistema solar temprano, agua enriquecida con isótopos de oxígeno pesado
Naoya Sakamoto1, Yusuke Seto, Shoichi Itoh
1Department of Natural History Sciences, Hokkaido University, Sapporo 060-0810, Japan.
Science (New York, N.Y.)
|June 16, 2007
Resumen
Los científicos descubrieron un material único en un meteorito, revelando evidencia de un depósito de agua extremadamente rico en 17O y 18O en el sistema solar temprano. Este hallazgo ayuda a explicar la composición isotópica de oxígeno del sistema solar.
Área de la Ciencia:
- Cosmoquímica es la cosmoquímica.
- Ciencias planetarias Ciencias planetarias.
- La geoquímica de los isótopos es la geoquímica de los isótopos.
Sus antecedentes:
- La composición isotópica de oxígeno del sistema solar sugiere la mezcla de dos reservas nebulosas distintas.
- La naturaleza y la composición del depósito rico en (17,18) O siguen siendo poco conocidas.
Objetivo del estudio:
- Para investigar la composición del depósito rico en (17,18) O en el sistema solar temprano.
- Para identificar el origen de las variaciones isotópicas de oxígeno en los meteoritos.
Principales métodos:
- Análisis in situ de una condrita carbonácea primitiva (Acfer 094).
- Caracterización química e isotópica de materiales matriciales de grano fino.
Principales resultados:
- Descubrimiento de un material omnipresente, químico y isotópico único en Acfer 094.4.
- Este material se formó a través de la oxidación del metal y los sulfuros por el agua.
- El análisis isotópico de oxígeno reveló agua altamente enriquecida en 17O y 18O (δ(17,18) O(SMOW) = +180‰).
Conclusiones:
- Proporciona la primera evidencia directa de un depósito extremadamente rico en (17,18) O en el sistema solar temprano.
- Esta reserva probablemente contribuyó significativamente a la composición isotópica de oxígeno general del sistema solar.
- Los hallazgos ofrecen información sobre la evolución del agua en el disco protoplanetario.
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