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Los movimientos absolutos de las placas y la deriva polar verdadera en ausencia de pistas de puntos calientes
Bernhard Steinberger1, Trond H Torsvik
1Centre for Geodynamics, Geological Survey of Norway, Leiv Eirikssons vei 39, 7491 Trondheim, Norway. bernhard.steinberger@ngu.no
Nature
|April 4, 2008
Resumen
Este estudio distingue el verdadero desplazamiento polar del movimiento de las placas durante 320 millones de años. Revela eventos de rotación distintos, lo que sugiere la estabilidad geoide a largo plazo y un nuevo marco de referencia para los procesos del manto.
Área de la Ciencia:
- La geofísica es la geofísica.
- La tectónica de placas es la tectónica de placas.
- El paleomagnetismo es el paleomagnetismo.
Sus antecedentes:
- El movimiento continental en relación con el eje de giro de la Tierra puede ser el resultado de una verdadera deambulación polar o movimiento de placas individuales.
- Distinguir estos movimientos es crucial para comprender la dinámica a largo plazo de la Tierra.
- La formación del supercontinente Pangea hace 320 millones de años proporciona un marco de tiempo clave.
Objetivo del estudio:
- Para diferenciar el verdadero desplazamiento polar del movimiento de las placas durante los últimos 320 millones de años.
- Para calcular el movimiento y rotación continental promedio global dentro de un marco de referencia paleomagnético.
- Establecer un nuevo marco de referencia para la relación entre los procesos de superficie y el manto profundo.
Principales métodos:
- Calculó el movimiento y la rotación continentales promedio global utilizando datos paleomagnéticos.
- Analizaron datos de los últimos 320 millones de años, desde la formación de Pangea.
- Componentes identificados de movimiento constante hacia el norte y eventos de rotación distintos.
Principales resultados:
- Identificó una constante deriva continental hacia el norte y eventos significativos de desplazamiento polar verdadero.
- Rotación documentada en sentido antihorario (hace 250-220 millones de años) y en sentido horario (hace 15 a 45 millones de años) alrededor de un eje específico cerca de la futura triple unión.
- Se observaron rotaciones adicionales (hace 145-135 millones de años y hace 110-100 millones de años) alrededor de un eje en el norte de África/Arabia, que se correlacionan con los máximos del geoide.
Conclusiones:
- Las rotaciones identificadas proporcionan evidencia de verdaderos eventos de desplazamiento polar.
- La rotación neta cercana a cero durante 320 millones de años indica la estabilidad a largo plazo de la estructura del geoide y el manto.
- Se propone un nuevo marco de referencia basado en el paleomagnetismo, corregido para el true polar wander, para los estudios del proceso del manto.
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