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Apoyo a la hipótesis del cataclismo lunar por el impacto de un meteorito lunar, las edades de fusión de los
B A Cohen1, T D Swindle, D A Kring
1The University of Arizona, Tucson, AZ 85721, USA. bcohen@utk.edu
Science (New York, N.Y.)
|January 11, 2000
Resumen
Los meteoritos lunares proporcionan nuevos conocimientos sobre el sistema Tierra-Luna. El análisis revela un corto e intenso período de bombardeo hace unos 3.900 millones de años, lo que apoya la hipótesis del cataclismo lunar.
Área de la Ciencia:
- Geología Geología Geología.
- Ciencias planetarias Ciencias planetarias.
- Estudios de impacto cósmico Estudios de impacto cósmico
Sus antecedentes:
- Los meteoritos lunares ofrecen una muestra más aleatoria de material lunar en comparación con las colecciones Apollo y Luna.
- Reexaminar la hipótesis del cataclismo lunar es crucial para comprender la historia temprana del sistema solar.
Objetivo del estudio:
- Para analizar el impacto de un meteorito lunar se derriten las edades para reevaluar la hipótesis del cataclismo lunar.
- Para determinar el momento y la intensidad de los antiguos eventos de bombardeo en el sistema Tierra-Luna.
Principales métodos:
- Utilizó técnicas de datación 40Ar-39Ar en muestras de fusión por impacto de meteoritos lunares (MAC 88105, QUE 93069, DaG 262, DaG 400).
- Analizó de siete a nueve eventos de impacto distintos representados dentro de las brechas de meteoritos.
Principales resultados:
- Las edades de fusión de impacto determinadas van desde hace 2.76 a 3.92 mil millones de años.
- Se observó una falta de fusión por impacto con edades mayores de 3.920 millones de años.
Conclusiones:
- Los hallazgos apoyan un modelo de un corto e intenso período de bombardeo de impacto hace aproximadamente 3.900 millones de años.
- Este período representa un pico anómalo en la actividad de impacto, distinto de una curva de frecuencia de impacto generalmente decreciente.
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