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Published on: July 3, 2016
Siete millones de años de glaciación en Groenlandia
Resumen
Los núcleos marinos del sureste de Groenlandia revelan múltiples glaciaciones del Cenozoico Tardío que comienzan en el Mioceno Tardío. La evidencia sugiere que la glaciación del Atlántico Norte puede haberse originado en el sur de Groenlandia debido a su topografía y precipitación.
Área de la Ciencia:
- Geología Geología Geología.
- Paleoclimatología Paleoclimatología
- Geología marina Geología marina.
Sus antecedentes:
- Las glaciaciones del Cenozoico tardío impactaron significativamente el clima y los paisajes de la Tierra.
- Comprender los orígenes y la extensión de las glaciaciones pasadas es crucial para el modelado climático.
- Los núcleos de sedimentos marinos proporcionan valiosos archivos de las condiciones ambientales pasadas.
Objetivo del estudio:
- Para reconstruir la historia de la glaciación a lo largo del sureste de Groenlandia. margen.
- Para identificar el momento y la extensión de los avances glaciales durante el Cenozoico Tardío.
- Para investigar el sitio potencial de nucleación de la glaciación del Atlántico Norte.
Principales métodos:
- Análisis de las tejas glaciares, las diamictitas glaciomarinas y los detritos de los núcleos marinos procedentes de las balsas de hielo.
- Correlación de los datos sedimentológicos con los registros estratigráficos sísmicos.
- Análisis geoquímico y petrográfico de conjuntos rocosos.
Principales resultados:
- Evidencia de múltiples glaciaciones que se remontan al Mioceno Tardío.
- Las diamictitas se correlacionan con la actividad glacial en el margen sureste de Groenlandia.
- Los avances de los glaciares hacia el mar ocurrieron durante las épocas Plioceno y Pleistoceno.
- Las altas montañas del sur de Groenlandia y las precipitaciones pueden haber facilitado la glaciación temprana.
Conclusiones:
- El sureste de Groenlandia experimentó una significativa actividad glacial durante todo el Cenozoico Tardío.
- Los hallazgos apoyan el papel del sureste de Groenlandia como un punto de origen potencial para la glaciación del Atlántico Norte.
- Los factores climáticos y topográficos regionales probablemente influyeron en el inicio de la glaciación.
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