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El estancamiento polar de la placa del Pacífico del Cretácico medio y sus implicaciones geodinámicas
Resumen
Los datos paleomagnéticos del Cretácico medio revelan un movimiento lento de la placa del Pacífico, similar al de Eurasia y América del Norte. Esto sugiere que las columnas del manto influyeron en la tectónica de placas del Pacífico durante este período.
Área de la Ciencia:
- El paleomagnetismo es el paleomagnetismo.
- La tectónica de placas es la tectónica de placas.
- La geodinámica es la geodinámica.
Sus antecedentes:
- Los datos paleomagnéticos del Cretácico medio indican un movimiento lento de la placa del Pacífico (<0,3°/año).
- Este movimiento refleja el estancamiento polar observado en Eurasia y América del Norte durante el mismo período.
- La formación de la meseta de Java Ontong marca un significativo episodio volcánico temprano del Aptiano.
Objetivo del estudio:
- Para investigar el movimiento de la placa del Pacífico durante el Cretácico Temprano y Medio.
- Determinar la relación entre la tectónica de placas y los principales eventos volcánicos, como la formación de la meseta de Java Ontong.
- Para evaluar la influencia del volcanismo del penacho del manto en la tectónica de la cuenca del Pacífico del Cretácico.
Principales métodos:
- Análisis de datos paleomagnéticos de las montañas del Cretácico Medio.
- Reconstrucción del movimiento de la placa del Pacífico basada en registros paleomagnéticos.
- Comparación del movimiento de las placas del Pacífico con los movimientos de placas de la época en Eurasia y América del Norte.
Principales resultados:
- El movimiento de las placas del Pacífico fue lento (<0,3°/año) en el Cretácico Temprano y Medio.
- Hay poca evidencia que sugiera un cambio en el movimiento de las placas que precedió al episodio volcánico temprano de Aptian y la formación de la meseta de Ontong Java.
- Las placas oceánicas adyacentes a la placa del Pacífico se movieron rápidamente durante el volcanismo.
- El movimiento significativo hacia el norte de la placa del Pacífico comenzó después del cese del vulcanismo.
Conclusiones:
- El volcanismo de la pluma del manto probablemente controló la tectónica de placas en la cuenca del Pacífico Cretácico.
- El cese del vulcanismo precedió al inicio del rápido movimiento de la placa del Pacífico.
- La dinámica del movimiento de las placas fue significativamente influenciada por la actividad del penacho del manto en el Cretácico.
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