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La edad isotópica del plomo de la Tierra puede explicarse solo por la formación del núcleo
Bernard J Wood1, Alex N Halliday
1Department of Earth Sciences, Parks Road, Oxford OX1 3PR, UK. berniew@earth.ox.ac.uk
Nature
|June 11, 2010
Resumen
La edad isotópica del plomo de la Tierra es consistente con la partición del plomo en el núcleo durante la acreción. Esto contradice las teorías de la pérdida volátil durante el impacto de formación de la Luna, apoyando una Tierra temprana bien mezclada.
Área de la Ciencia:
- La geoquímica es la geoquímica.
- Geología de Isótopos Geología de Isótopos.
- Ciencias planetarias Ciencias planetarias.
Sus antecedentes:
- La interpretación de la edad isotópica del plomo de la Tierra ha sido objeto de debate.
- Las hipótesis anteriores sugirieron que la pérdida volátil durante el impacto de formación de la Luna influyó en las firmas isotópicas del plomo.
- Teorías alternativas propusieron la partición del plomo en líquidos metálicos durante la formación del núcleo.
Objetivo del estudio:
- Para investigar el comportamiento de partición del plomo en el hierro líquido bajo contenido variable de carbono.
- Reevaluar las implicaciones de los datos isotópicos de plomo para la formación de la Tierra y su historia temprana.
Principales métodos:
- Determinación experimental de la separación del plomo entre el hierro líquido y las fundiciones de silicato.
- Análisis de datos isotópicos en conjunto con resultados experimentales.
- Modelado del comportamiento del plomo durante la acreción de la Tierra y la formación del núcleo.
Principales resultados:
- La partición del plomo en hierro líquido depende en gran medida del contenido de carbono.
- Con un ~0.2% de carbono, el plomo se divide fuertemente en el núcleo a lo largo de la acreción de la Tierra.
- Los datos experimentales e isotópicos apoyan la incorporación significativa de plomo en el núcleo.
Conclusiones:
- La edad isotópica del plomo de la Tierra es consistente con la partición del núcleo.
- No hay evidencia de una pérdida significativa de elementos volátiles en etapa tardía durante el impacto gigante.
- La historia temprana de la Tierra involucró una incorporación sustancial de plomo en el núcleo, no una pérdida volátil.
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