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Simulation of the Planetary Interior Differentiation Processes in the Laboratory
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Los asteroides y las andesitas.

Richard Arculus1, Ian H Campbell, Scott M McLennan

  • 1Research School of Earth Sciences, Australian National University, Canberra, Australian Capital Territory 0200, Australia. Ross.Taylor@anu.edu.au

Nature
|May 30, 2009
PubMed
Resumen

Este estudio desafía la afirmación de que ciertos meteoritos representan una nueva forma de formar costras de andesita en los asteroides. El análisis muestra que las teorías existentes para la generación de andesita siguen siendo válidas.

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Área de la Ciencia:

  • Ciencias planetarias Ciencias planetarias.
  • La geoquímica es la geoquímica.

Sus antecedentes:

  • La producción de andesita terrestre en las zonas de subducción es bien conocida.
  • Un estudio reciente propuso un nuevo mecanismo para la generación de corteza de andesita en asteroides utilizando los meteoritos GRA 06128 y GRA 06129.

Objetivo del estudio:

  • Evaluar el reclamo de un nuevo modo de generación de corteza de andesita en asteroides.
  • Para analizar los datos de composición de los meteoritos GRA 06128 y GRA 06129.

Principales métodos:

  • Análisis de datos de elementos de tierras raras (REE) y otros elementos lipofílicos.
  • Comparación de las composiciones de los meteoritos con los modelos existentes de formación de la corteza planetaria.

Principales resultados:

  • Los datos de composición, especialmente para los REE, no respaldan el nuevo mecanismo propuesto para la generación de andesita.
  • Las composiciones de los meteoritos estudiados son consistentes con los procesos conocidos de formación de andesita.

Conclusiones:

  • La afirmación de un nuevo modo de generación de andesita en asteroides no está sustentada por los datos proporcionados.
  • Los mecanismos actuales para la generación de crestas planetarias andesíticas siguen siendo válidos y no requieren revisión.