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La acreción heterogénea y el presupuesto de elementos moderadamente volátiles de la Tierra
M Schönbächler1, R W Carlson, M F Horan
1School of Earth, Atmospheric and Environmental Sciences, University of Manchester, Manchester M13 9PL, UK. maria.schonbachler@manchester.ac.uk
Science (New York, N.Y.)
|May 15, 2010
Resumen
La Tierra La Tierra La Tierra La Tierra La Tierra
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- La geoquímica es la geoquímica.
- La geoquímica de los isótopos es la geoquímica de los isótopos.
Sus antecedentes:
- Los modelos de formación de la Tierra carecen de restricciones sobre los materiales precursores y los procesos de acreción.
- Comprender el contenido volátil de la Tierra es crucial para su evolución y habitabilidad.
Objetivo del estudio:
- Para investigar la composición volátil del manto de la Tierra utilizando datos de isótopos de plata y paladio.
- Para conciliar pruebas isotópicas contradictorias con respecto a la historia de la acreción de la Tierra.
Principales métodos:
- Análisis isotópico de alta precisión del paladio-plata (Pd-Ag).
- Comparación de los datos de isótopos terrestres con los meteoritos condríticos.
Principales resultados:
- El manto de la Tierra exhibe una firma de isótopos de paladio-plata (107Ag/109Ag) similar a las condritas ricas en volátiles.
- La acreción heterogénea reconcilia los datos de isótopos de cromo y estroncio, lo que sugiere un cambio de materiales empobrecidos a materiales ricos en volátiles.
- El impactador que formó la Luna probablemente poseía un manto oxidado y rico en volátiles.
Conclusiones:
- La Tierra acumuló cantidades significativas de elementos moderadamente volátiles, contrariamente a algunos modelos anteriores.
- La acreción heterogénea, incluida una etapa tardía rica en volátiles, dio forma a la composición de la Tierra.
- El impacto gigante que formó la Luna jugó un papel clave en el inventario volátil de la Tierra.
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