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Las condrulas ricas en gas noble en un meteorito enstatita

R Okazaki¹, N Takaoka, K Nagao

¹Department of Earth and Planetary Sciences, Faculty of Sciences, Kyushu University 33, Hakozaki, Fukuoka 812-8581, Japan. okazaki@eqchem.s.u-tokyo.ac.jp

|August 24, 2001

Resumen

Los meteoritos primitivos llamados condritas contienen condrules, que atrapan importantes gases nobles. Estos hallazgos sugieren que los gases solares fueron implantados en los precursores de condrules, con alguna pérdida de gas con el tiempo.

Área de la Ciencia:

Ciencia Cósmica Ciencia Cósmica es la ciencia cósmica.
Ciencias planetarias Ciencias planetarias.
La meteorología es meteorítica.

Sus antecedentes:

Las condrulas son esferulas de silicato que se encuentran en los meteoritos primitivos (condritas).
Se cree que se forman a partir del rápido enfriamiento de la fusión de silicatos en el Sistema Solar temprano.
El entendimiento convencional es que las cóndrulas pierden todos los gases nobles durante la fusión.

Objetivo del estudio:

Para investigar el contenido de gases nobles en condrules de la condrita enstatita Yamato-791790.
Para determinar el origen y las características de los gases nobles atrapados en estos materiales primitivos.

Principales métodos:

Análisis de gases nobles dentro de los cóndrulos del meteorito Yamato-791790.
Determinación de las relaciones elementales, específicamente 36Ar/132Xe y 84Kr/132Xe.

Principales resultados:

Descubrimiento de importantes gases nobles atrapados en condrules de Yamato-791790.
Las relaciones elementales observadas (36Ar/132Xe, 84Kr/132Xe) se asemejan a las composiciones de los gases "subsolares".
Estas proporciones son las más altas registradas después de los gases nobles de tipo solar.

Conclusiones:

Los hallazgos desafían la noción de que las cóndrulas pierden completamente gases nobles al derretirse.
Los datos apoyan un modelo de implantación de gas solar en los precursores de la condrula.
La difusión incompleta de los gases a lo largo del tiempo explica las altas concentraciones observadas de gases nobles y las proporciones elementales.

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