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Un componente similar a Mercurio de la Tierra primitiva produce uranio en el núcleo y el manto superior (142) Nd Nd

Anke Wohlers¹, Bernard J Wood¹

¹Department of Earth Sciences, University of Oxford, South Parks Road, Oxford OX1 3AN, UK.

|April 17, 2015

Resumen

El núcleo de la Tierra puede ser la clave de su inusual composición elemental. La formación del núcleo podría explicar la alta relación entre samario y neodimio (Sm/Nd) del manto y proporcionar una fuente de calor faltante para la geodinámica.

Área de la Ciencia:

La geoquímica es la geoquímica.
Ciencias planetarias Ciencias planetarias.
La geoquímica de los isótopos es la geoquímica de los isótopos.

Sus antecedentes:

Datos recientes del isótopo (142) Nd revelan una relación elemental supercondrítica entre samario y neodimio (Sm/Nd) en la porción de silicato de la Tierra.
Esta anomalía se atribuye a un reservorio oculto o a una pérdida temprana de la corteza terrestre a través de la ablación por impacto.
La pérdida de la corteza corta el equilibrio de la producción de calor terrestre debido a la eliminación de los elementos productores de calor.

Objetivo del estudio:

Para investigar si la formación del núcleo podría fraccionar el neodimio (Nd) a partir del samario (Sm).
Para determinar si el núcleo actúa como un sumidero para los elementos que producen calor.
Para conciliar la relación Sm/Nd observada y el presupuesto de calor de la Tierra.

Principales métodos:

Modelado de los efectos de la formación del núcleo en la fraccionamiento elemental.
Evaluación de la partición de los elementos lipofílicos (por ejemplo, U, Th) en el núcleo.
Analizando la firma isotópica de (142) Nd/(144) Nd.

Principales resultados:

La adición de un cuerpo reducido rico en azufre (similar al mercurio o similar a la enstatita-condrita) a la Tierra primitiva genera un Sm/Nd supercondrítico en el manto.
Este proceso da como resultado una anomalía positiva (142) Nd / (144) Nd de ~ 14 ppm en relación con la condrita.
Un núcleo rico en azufre separa efectivamente el uranio y, en menor medida, el torio, contribuyendo a la fuente de calor de la geodinamo.

Conclusiones:

La formación de núcleos proporciona un mecanismo viable para la relación supercondrítica Sm/Nd observada en la Tierra de silicato.
El núcleo puede actuar como un sumidero significativo para los elementos productores de calor como el uranio y el torio.
Este modelo concilia la anomalía isotópica y el presupuesto de calor interno de la Tierra, lo que sugiere el papel crucial de la formación del núcleo en la evolución planetaria.

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