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El xenón de fisión de plutonio se encuentra en el manto de la Tierra
1J. Kunz, Institut de Physique du Globe de Paris, Laboratoire de Geochimie et Cosmochimie, Centre National de la Recherche Scientifique URA 1758, 4 place Jussieu, F-75252 Paris Cedex 05, France. T. Staudacher, Institut de Physique du.
Resumen
La fisión del plutonio-244 explica el 30% de la Tierra.
Área de la Ciencia:
- La geoquímica es la geoquímica.
- Cosmoquímica es la cosmoquímica.
- Ciencias planetarias Ciencias planetarias.
Sus antecedentes:
- Los isótopos de xenón en el interior de la Tierra proporcionan información sobre los primeros procesos del sistema solar.
- Los gases nobles radiogénicos son marcadores cruciales para la formación y evolución planetaria.
Objetivo del estudio:
- Para cuantificar la contribución de la fisión del plutonio-244 al xenón fisiogénico de la Tierra.
- Para refinar el tiempo de la acreción de la Tierra y la formación atmosférica.
Principales métodos:
- Análisis de vidrios de basalto de la cresta del océano medio.
- Las técnicas de datación radiométrica.
- Análisis isotópico del xenón y otros gases nobles.
Principales resultados:
- La fisión del plutonio-244 (Pu-244) representa aproximadamente el 30% de los excesos de xenón fisiogénico.
- La fisión espontánea del uranio-238 (U-238) explica el xenón fisiogénico restante.
- Los excesos de xenón-129 (Xe-129) indican que la acreción de la Tierra concluyó entre 50 y 70 millones de años después de la formación del sistema solar.
Conclusiones:
- Los primeros radionúclidos del sistema solar, como el Pu-244, influyeron significativamente en la composición isotópica de la Tierra.
- La atmósfera de la Tierra probablemente se formó a través de la desgasificación del manto.
- El tiempo de la acreción de la Tierra está limitado por los datos de radionúclidos extintos.
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