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Las escalas de tiempo de los procesos de choque en los meteoritos condríticos y marcianos
P Beck1, Ph Gillet, A El Goresy
1Laboratoire de Sciences de la Terre, CNRS UMR 5570, Ecole Normale Supérieure de Lyon et Université Lyon I, 46 allée d'Italie, 69364 Lyon Cedex 7, France. pbeck@ens-lyon.fr
Nature
|June 24, 2005
Resumen
El estudio de las ondas de choque de los meteoritos revela el tamaño del impactador y la dinámica de los cráteres. Los impactos de condritas fueron más grandes y más largos que los de Marte, ofreciendo información sobre la acreción planetaria.
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- Cosmoquímica es la cosmoquímica.
- Estudios de cráteres de impacto Estudios de cráteres de impacto
Sus antecedentes:
- La acreción de planetas terrestres y la entrega de meteoritos están ampliamente modeladas.
- Los meteoritos impactados ofrecen información sobre la evolución del Sistema Solar y los procesos de impacto.
Objetivo del estudio:
- Determine la presión máxima de choque y la duración del impacto en una condrita y un meteorito marciano.
- Inferir los tamaños del impactador y las dimensiones del cráter en los cuerpos padres utilizando las leyes de escala de impacto.
Principales métodos:
- Análisis de las distribuciones de oligoelementos en las venas de fusión de corte de meteoritos.
- Utilizando datos minerales de alta presión para inferir la duración del evento de choque.
- Aplicación de leyes de escala de impacto para estimar el tamaño del impactador y del cráter.
Principales resultados:
- La duración del choque y el tamaño del impactador fueron significativamente mayores para la condrita (aprox. 1 s, 5 km) en comparación con el meteorito marciano (aprox. 10 ms, 100 m) en el tiempo.
- El impactador del meteorito marciano y los tamaños del cráter se alinean con el modelado numérico de la formación de cráteres marcianos.
Conclusiones:
- Los meteoritos marcianos proporcionan datos valiosos para comprender los procesos de impacto en Marte.
- Sugiere que los meteoritos marcianos recientes pueden provenir de regiones localizadas en Marte.
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