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La dinámica de la ruptura del Atlántico Norte en el Paleoceno medio está vinculada con las deformaciones intraplacas

Søren B Nielsen¹, Randell Stephenson, Erik Thomsen

¹Department of Earth Science, University of Aarhus, Høegh-Guldbergsgade 2, DK-8000 Aarhus C, Denmark. sbn@geo.au.dk

|December 14, 2007

Resumen

La ruptura continental causó un cambio en la deformación de la placa europea hace 62 millones de años. Este estudio vincula la ruptura del Atlántico Norte con los cambios en la tensión intraplaca, refutando las teorías de la pluma del manto.

Área de la Ciencia:

La geofísica es la geofísica.
La tectónica es la tectónica.
Ciencias de la Tierra Ciencias de la Tierra

Sus antecedentes:

La ruptura continental ofrece información sobre la tectónica de placas y la dinámica del manto profundo.
Las reconstrucciones cinemáticas de placas carecen de información detallada sobre el tiempo y la dinámica de los eventos.
La deformación intraplaca registra los cambios de tensión de los procesos de borde de placa.

Objetivo del estudio:

Demostrar un vínculo causal entre la ruptura continental del Atlántico Norte y la deformación intraplaca europea.
Investigar el papel de los cambios de tensión en la ruptura continental.
Para refinar la comprensión de la sincronización de eventos tectónicos más allá de la cinemática de placas.

Principales métodos:

Análisis de los estilos de deformación intra-placa en respuesta a los cambios de tensión.
Correlación de los eventos geológicos con las reconstrucciones tectónicas de placas.
Modelado de la transferencia de tensiones desde los límites de las placas a los interiores continentales.

Principales resultados:

Se encontró una relación causal entre la ruptura del Atlántico Norte (~ 62 Ma) y un cambio en la deformación intraplaca europea.
El rifting del Atlántico Norte detuvo la convergencia entre Europa y África.
La deformación intraplaquetaria por contracción en Europa cesó y fue reemplazada por la relajación por tensión.
El estrés tectónico previo a la ruptura, no una pluma del manto, probablemente impulsó la ruptura continental.

Conclusiones:

La ruptura continental está directamente relacionada con los cambios en la tensión intraplaca.
Los registros estratigráficos intracontinentales proporcionan información crucial sobre el tiempo y la dinámica de los eventos tectónicos.
La tectónica de placas, no las columnas del manto, puede impulsar la ruptura continental e influir en la dinámica del manto profundo.

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