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Historia de los meteoritos de la luna recogidos en la Antártida
Science (New York, N.Y.)
|September 15, 1989
Resumen
Los meteoritos lunares encontrados en la Antártida se originaron en al menos dos sitios de impacto lunar distintos. El análisis revela variados tiempos de tránsito de la Luna a la Tierra, con algunas muestras que tardan millones de años en llegar.
Área de la Ciencia:
- Geología Geología Geología.
- Ciencias planetarias Ciencias planetarias.
- Cosmoquímica es la cosmoquímica.
Sus antecedentes:
- Los meteoritos lunares son muestras raras de la superficie de la Luna.
- El material lunar expulsado puede viajar a la Tierra a través de eventos de impacto.
- El hielo antártico preserva los meteoritos, ofreciendo oportunidades científicas únicas.
Objetivo del estudio:
- Para determinar el origen y procedencia de los meteoritos lunares encontrados en la Antártida.
- Para investigar la duración de la transferencia lunar-Tierra para estas muestras.
- Hasta la fecha de la caída terrestre de estos meteoritos lunares.
Principales métodos:
- Análisis de isótopos de gas noble de muestras de meteoritos.
- Mediciones de radionúclidos producidos por rayos cósmicos.
- Análisis de la composición química de los meteoritos lunares.
Principales resultados:
- Cinco meteoritos lunares se originaron en al menos dos cráteres de impacto lunares diferentes.
- Es probable que los sitios de impacto estén alejados de las zonas de aterrizaje conocidas de Apolo y Luna.
- Los tiempos de tránsito de la Luna a la Tierra variaron: 5-11 millones de años para tres meteoritos, <300,000 años para otros dos.
- Las fechas de caída terrestres oscilan entre 70.000 y 170.000 años atrás.
Conclusiones:
- Los meteoritos lunares proporcionan información sobre los procesos de impacto y la geología lunar.
- Los diversos tiempos de tránsito sugieren diferentes mecanismos de eyección y vías orbitales.
- Los meteoritos lunares antárticos son valiosos para comprender la evolución de la superficie lunar y el clima espacial.
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