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La disminución del nivel del mar durante la glaciación de Illinois: evidencia de un "agujero azul" en las Bahamas
Science (New York, N.Y.)
|August 24, 1979
Resumen
Las estalagmitas fósiles encontradas a 45 metros bajo el nivel del mar en las Bahamas indican una caída significativa del nivel del mar de al menos 42 metros durante el evento glacial de Illinois hace 160.000-139.000 años.
Área de la Ciencia:
- Geología Geología Geología.
- Paleoclimatología Paleoclimatología
- Espeleología Espeleología.
Sus antecedentes:
- Los sistemas de cuevas kársticas submarinas ofrecen una visión única de las condiciones ambientales pasadas.
- Las estalagmitas pueden preservar registros de la historia geológica y climática.
Objetivo del estudio:
- Para determinar los niveles pasados del mar utilizando espeleotemas sumergidos.
- Para reconstruir los cambios en el nivel del mar durante el período glacial de Illinois.
Principales métodos:
- Recuperación de estalagmitas de una cueva submarina cerca de la isla de Andros, Bahamas.
- La datación de la serie de uranio de las espeleotemas.
- Corrección para la contaminación marina por carbonatos.
Principales resultados:
- Se encontraron estalagmitas a 45 metros por debajo del nivel actual del mar.
- La deposición de Speleothem se produjo entre 160.000 y 139.000 años antes del presente.
- Esto indica una caída mínima del nivel del mar de 42 metros, teniendo en cuenta el hundimiento.
Conclusiones:
- Los niveles del mar fueron significativamente más bajos durante el evento glacial de Illinois.
- Las espeleotemas sumergidas son valiosos archivos para las reconstrucciones paleoceanográficas.
- Los hallazgos proporcionan evidencia directa de las fluctuaciones del nivel del mar de la era glacial en las Bahamas.
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