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Retención de 40Ar en los planetas terrestres
E Bruce Watson1, Jay B Thomas, Daniele J Cherniak
1Department of Earth and Environmental Sciences, Rensselaer Polytechnic Institute, Troy, New York 12180, USA. watsoe@rpi.edu
Nature
|September 21, 2007
Resumen
Los modelos de desgasificación planetaria se enfrentan a desafíos a medida que los nuevos datos muestran que el argón se retiene en el manto de la Tierra. Esto sugiere que los procesos magmáticos pueden no ser el mecanismo principal para liberar gases como el 40Ar a la atmósfera.
Área de la Ciencia:
- La geoquímica es la geoquímica.
- Ciencias planetarias Ciencias planetarias.
- La geofísica es la geofísica.
Sus antecedentes:
- Se cree que la Tierra sólida ha perdido gases primordiales a través de la liberación catastrófica temprana y los procesos geológicos en curso.
- La abundancia atmosférica de 40Ar se utiliza tradicionalmente para estimar la pérdida de gas integrada en el tiempo del interior del planeta.
Objetivo del estudio:
- Investigar la idoneidad de la desgasificación magmática como el único mecanismo para liberar 40Ar.
- Desafiar el punto de vista prevaleciente de un manto superior desgaseado con respecto al 40Ar.
Principales métodos:
- Análisis del comportamiento del argón en las principales fases de planetas terrestres.
- Evaluación de las tasas de difusión de argón en condiciones de manto superior.
Principales resultados:
- El argón exhibe compatibilidad dentro de las principales fases minerales planetarias.
- La difusión de argón es lenta bajo temperaturas y presiones típicas del manto superior.
- Estos hallazgos contradicen el supuesto de una desgasificación magmática eficiente de 40Ar.
Conclusiones:
- El simple modelo de desgasificación magmática para la liberación de 40Ar es insuficiente.
- El comportamiento del argón desafía su uso como único monitor para la desgasificación planetaria.
- Se proponen mecanismos alternativos, como la hidratación de la litosfera oceánica, para la liberación de argón.
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