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La convección del manto a pequeña escala produce secuencias estratigráficas en cuencas sedimentarias
K D Petersen1, S B Nielsen, O R Clausen
1Department of Earth Science, Aarhus University, DK-8000 Aarhus C, Denmark. kenni@geo.au.dk
Science (New York, N.Y.)
|August 14, 2010
Resumen
La convección del manto a pequeña escala puede crear depósitos sedimentarios cíclicos, imitando secuencias previamente atribuidas a los cambios en el nivel del mar. Estas secuencias impulsadas por convección tienen distancias de correlación más cortas, desafiando las interpretaciones existentes de las variaciones eustáticas del nivel del mar.
Área de la Ciencia:
- Geología Geología Geología.
- La geofísica es la geofísica.
- La sedimentología sedimentológica.
Sus antecedentes:
- Los depósitos sedimentarios cíclicos conectan secuencias estratigráficas geográficamente distantes de entornos de deposición compartidos.
- Estas secuencias a menudo exhiben ciclos de 2 a 20 millones de años, comúnmente relacionados con variaciones eustáticas del nivel del mar o eventos tectónicos.
Objetivo del estudio:
- Investigar el papel potencial de la convección del manto a pequeña escala en la generación de secuencias sedimentarias cíclicas.
- Para evaluar la correlación espacial y la periodicidad de las secuencias estratigráficas impulsadas por convección.
Principales métodos:
- Se empleó modelado numérico para simular los efectos de la convección del manto a pequeña escala en la superficie de la Tierra.
- Los modelos se centraron en los recurrentes movimientos verticales de superficie locales y regionales inducidos por la convección.
Principales resultados:
- La convección del manto a pequeña escala puede, de hecho, generar secuencias estratigráficas con períodos de 2 a 20 millones de años.
- Estas secuencias impulsadas por convección exhiben correlación sólo en distancias de hasta unos pocos cientos de kilómetros.
Conclusiones:
- La convección del manto a pequeña escala es un mecanismo viable para producir secuencias estratigráficas cíclicas.
- La limitada distancia de correlación de las secuencias impulsadas por convección sugiere que algunas interpretaciones de las variaciones eustáticas del nivel del mar en la estratigrafía de secuencias pueden ser inexactas.
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