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Un registro lacustre de 40 millones de años del forzamiento climático orbital mesozoica temprana
Science (New York, N.Y.)
|November 14, 1986
Resumen
Las variaciones orbitales impulsaron los ciclos climáticos en los primeros grandes lagos del Mesozoico, evidenciados por capas sedimentarias en América del Norte. Estos antiguos patrones climáticos, impulsados por la Tierra.
Área de la Ciencia:
- Paleoclimatología Paleoclimatología
- Geología sedimentaria Geología sedimentaria.
- La estratigrafía del Mesozoico.
Sus antecedentes:
- Los sedimentos del supergrupo Newark del Mesozoico temprano revelan patrones cíclicos.
- Estos ciclos están vinculados a los grandes sistemas de lagos que responden a los cambios climáticos.
Objetivo del estudio:
- Para analizar los ciclos sedimentarios en la cuenca de Newark en busca de evidencia de forzamiento orbital.
- Para determinar si los ciclos orbitales de la Tierra influyeron en el clima durante el Mesozoico temprano libre de hielo.
Principales métodos:
- Análisis de Fourier del grosor sedimentario en las formaciones Lockatong y Passaic.
- Utilizando la datación radiométrica y las tasas de sedimentación calibradas por varva para la calibración de la escala de tiempo.
Principales resultados:
- Se identificaron periodicidades de espesor sedimentario (5.9-96.0m) correspondientes a periodicidades temporales (25k-400k años).
- Se han observado estrechas relaciones entre las periodicidades de los ciclos y los períodos actuales de los ciclos orbitales de la Tierra.
- Encontraron secuencias similares de ciclos sedimentarios a lo largo de 40 millones de años en el supergrupo de Newark.
Conclusiones:
- La evidencia sólida apoya el forzamiento orbital del clima durante el Mesozoico temprano libre de hielo.
- Los períodos del ciclo orbital de la Tierra eran similares hace 200 millones de años en comparación con hoy.
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