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Una cronología de los cambios del nivel del mar en el Paleozoico
Bilal U Haq1, Stephen R Schutter
1National Science Foundation, Arlington, VA 22230, USA. bhaq@nsf.gov
Science (New York, N.Y.)
|October 4, 2008
Resumen
Este estudio reconstruye los niveles del mar de la Era Paleozoica, revelando tendencias a largo plazo y 172 eventos eustáticos. El nivel del mar fluctuó significativamente, con magnitudes de hasta 125 metros, impactado por eventos como la glaciación de Hirnantian.
Área de la Ciencia:
- Paleontología Paleontología.
- La estratigrafía es la estratigrafía.
- La paleoceanografía es la paleoceanografía.
Sus antecedentes:
- La historia del nivel del mar de la Era Paleozoica permanece incompletamente integrada.
- Los estudios anteriores se centraron en períodos específicos, sin una visión general completa.
- Comprender los cambios pasados del nivel del mar es crucial para las reconstrucciones paleoclimáticas y tectónicas.
Objetivo del estudio:
- Para reconstruir una historia completa de las fluctuaciones del nivel del mar a lo largo de toda la Era Paleozoica.
- Para identificar y documentar eventos eustáticos individuales y sus magnitudes.
- Para analizar las tendencias a largo plazo del nivel del mar y sus impulsores.
Principales métodos:
- Se utilizaron secciones estratigráficas de las cuencas pericratónica y cratónica.
- Tiempo y amplitud evaluados de los eventos individuales del nivel del mar.
- Datos integrados para establecer una curva unificada del nivel del mar para el Paleozoico.
Principales resultados:
- Documentó 172 eventos eustáticos a lo largo del Paleozoico.
- Identificó un aumento del nivel del mar a largo plazo a través del Cámbrico hasta un cenit tardío del Ordovícico.
- Se observaron fluctuaciones significativas del nivel del mar, incluida una retirada durante la glaciación de Hirnantian y los máximos y mínimos posteriores.
- Las magnitudes del cambio en el nivel del mar variaron de decenas de metros a aproximadamente 125 metros.
Conclusiones:
- Se ha establecido una historia detallada del nivel del mar para la Era Paleozoica.
- Las fluctuaciones del nivel del mar fueron dinámicas, influenciadas por las glaciaciones y la actividad tectónica.
- La estimación precisa de la magnitud del cambio en el nivel del mar sigue siendo un desafío.
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