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La marea nodal lunar y la distancia a la Luna durante el Precámbrico
1Department of Atmospheric and Oceanic Sciences, The University of Michigan, Ann Arbor 48109, USA.
Nature
|April 17, 1986
Resumen
Los investigadores determinaron la distancia lunar antigua utilizando formaciones de hierro con bandas del Precámbrico. Este hallazgo apoya la estabilidad a largo plazo de la órbita lunar y ofrece nuevos conocimientos sobre la evolución temprana de las mareas de la Tierra.
Área de la Ciencia:
- Paleoclimatología Paleoclimatología
- La geofísica es la geofísica.
- La ciencia lunar es la ciencia lunar.
Sus antecedentes:
- Los modelos anteriores de evolución de las mareas sugieren una catastrófica colisión entre la Tierra y la Luna en un pasado lejano, sin evidencia directa.
- Comprender la antigua distancia lunar es crucial para reconstruir el clima temprano de la Tierra y la dinámica orbital.
Objetivo del estudio:
- Para determinar directamente la distancia lunar durante la era precámbrica.
- Para probar la hipótesis de que las mareas nodulares lunares influyeron en los patrones climáticos antiguos.
Principales métodos:
- Análisis de una formación de hierro en bandas australiana (BIF) de hace 2.500 millones de años.
- Identificación de una periodicidad de 23.3 ± 0.3 años interpretada como una firma de la marea nodal lunar.
- Cálculo de la distancia lunar antigua basada en la periodicidad observada.
Principales resultados:
- Se identificó una periodicidad de 23.3 ± 0.3 años en un BIF de 2.5 mil millones de años.
- Esta periodicidad se atribuye a la influencia climática de la marea nodal lunar.
- La distancia lunar calculada en 2.5 mil millones de años antes del presente fue de aproximadamente 52 radios terrestres.
Conclusiones:
- Los hallazgos proporcionan la primera evidencia directa de la distancia lunar en el Precámbrico.
- La historia inferida de la fricción de las mareas del Precámbrico se alinea con los datos paleontológicos y la estabilidad orbital lunar.
- Este método ofrece un nuevo enfoque potencial para determinar las antiguas distancias lunares mediante el análisis de los ciclos de Milankovitch en el registro sedimentario del Precámbrico.
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