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El origen de la firma de gas noble terrestre
Svyatoslav S Shcheka1, Hans Keppler
1Bayerisches Geoinstitut, Universität Bayreuth, 95440 Bayreuth, Germany. svyatoslav.shcheka@uni-bayreuth.de
Nature
|October 12, 2012
Resumen
El xenón se agota en la atmósfera de la Tierra en relación con el argón. Este estudio sugiere que la temprana cristalización de la perovskita de la Tierra atrapó el argón, lo que lleva al agotamiento del xenón atmosférico.
Área de la Ciencia:
- La geoquímica es la geoquímica.
- Ciencias planetarias Ciencias planetarias.
- Física mineral Física de los minerales
Sus antecedentes:
- El xenón está significativamente agotado en relación con el argón en las atmósferas de la Tierra y Marte en comparación con los meteoritos condríticos.
- La razón de este agotamiento de los gases nobles atmosféricos sigue siendo poco comprendida.
Objetivo del estudio:
- Para investigar la solubilidad del argón y el xenón en MgSiO ((3) perovskita, el mineral primario en el manto inferior de la Tierra.
- Proponer un modelo que explique el agotamiento observado del xenón en relación con el argón en las atmósferas planetarias.
Principales métodos:
- Determinación experimental de la solubilidad del argón y el xenón en MgSiO ((3) perovskita bajo condiciones de alta presión y alta temperatura.
- Modelado geoquímico de la evolución atmosférica temprana de la Tierra y Marte.
Principales resultados:
- La solubilidad de argón en MgSiO(3) perovskita es sustancial (más de 1 por ciento en peso), mientras que la solubilidad de xenón es órdenes de magnitud más baja.
- La cristalización de la perovskita de un océano de magma preferentemente secuestra el argón en el manto inferior.
Conclusiones:
- La solubilidad diferencial del argón y el xenón en la perovskita proporciona un mecanismo para los agotamientos atmosféricos observados.
- Este proceso, que ocurre durante la cristalización temprana del océano de magma, explica la relación xenón-argon en las atmósferas de la Tierra y potencialmente de Marte.
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