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Formación temprana de la corteza asteroidal evolucionada y desarrollada.
James M D Day1, Richard D Ash, Yang Liu
1Department of Geology, University of Maryland, College Park, Maryland 20742, USA. jamesday@umd.edu
Nature
|January 9, 2009
Resumen
Los meteoritos recién descubiertos revelan un tipo previamente desconocido de formación de corteza evolucionada en los asteroides. Estas rocas ricas en feldespato proporcionan evidencia de los primeros procesos del Sistema Solar y diversos materiales planetarios.
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- Cosmoquímica es la cosmoquímica.
- Geología Geología Geología.
Sus antecedentes:
- Los mecanismos de formación de la corteza planetaria no se comprenden por completo.
- La corteza andesítica de la Tierra se formó a través de la tectónica de placas; la corteza rica en feldespato de la Luna se formó a partir de procesos oceánicos de magma.
- Algunos asteroides muestran evidencia de formación y diferenciación de la corteza, pero no se ha observado una corteza felsica evolucionada.
Objetivo del estudio:
- Para investigar el origen y la composición de los meteoritos recién descubiertos GRA 06128 y GRA 06129.
- Para entender los procesos de formación de la corteza en los asteroides en el Sistema Solar temprano.
Principales métodos:
- La datación de los meteoritos mediante el uso de métodos radiométricos.
- Análisis de la composición elemental e isotópica.
- Análisis petrográfico y metamórfico.
Principales resultados:
- Los meteoritos GRA 06128 y GRA 06129 son ricos en feldespato con composiciones masivas de andesita.
- Su edad de 4.52 ± 0.06 Gyr indica la formación temprana en la historia del Sistema Solar.
- Los datos compositivos e isotópicos sugieren la formación a partir de fusiones parciales de un asteroide oxidado rico en volátiles.
Conclusiones:
- GRA 06128 y 06129 representan un nuevo estilo de formación de la corteza evolucionada en los asteroides.
- Estos hallazgos indican una diferenciación incompleta de su asteroide progenitor.
- El descubrimiento pone de relieve la diversidad no reconocida previamente en los primeros materiales del Sistema Solar.
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