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Evidencia isotópica Hf-W de acreción y diferenciación rápidas en el Sistema Solar temprano
1Department of Geological Sciences, University of Michigan, Ann Arbor, MI 48109-1063 USA.
Science (New York, N.Y.)
|December 13, 1996
Resumen
Los objetos del sistema solar interno se acrecentaron y diferenciaron rápidamente en unos pocos millones de años. Los datos isotópicos de tungsteno de los meteoritos revelan la rápida formación de cuerpos padres y la segregación de metales en el sistema solar temprano.
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- Cosmoquímica es la cosmoquímica.
- Geocronología Geocronología.
Sus antecedentes:
- Las escalas de tiempo de acreción y diferenciación de los cuerpos del sistema solar interior siguen siendo inciertas debido a los sistemas isotópicos de meteoritos perturbados.
- El decaimiento del hafnio-182 (182Hf) al tungsteno-182 (182W) proporciona un valioso cronómetro debido a la naturaleza refractaria e inmóvil de ambos elementos.
Objetivo del estudio:
- Para determinar las escalas de tiempo de acreción y diferenciación de los primeros objetos del sistema solar.
- Para utilizar el sistema isotópico 182Hf-182W para mediciones cronológicas precisas.
Principales métodos:
- Análisis de las composiciones isotópicas de tungsteno en varias clases de meteoritos, incluyendo IIA, IIIA, IVA, meteoritos de hierro anómalos y condritas H, L y LL.
- Aplicación del sistema de desintegración 182Hf-182W como cronómetro.
Principales resultados:
- Los datos isotópicos de tungsteno indican una rápida acreción de cuerpos madre para los meteoritos estudiados.
- La evidencia sugiere que la segregación de metales ocurrió dentro de los primeros millones de años de la formación del sistema solar.
Conclusiones:
- El sistema solar primitivo experimentó rápidos procesos de formación y diferenciación.
- El sistema 182Hf-182W es una herramienta robusta para la datación de los primeros eventos del sistema solar.
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