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50-Ma iniciación de Hawaiian-Emperor curva registros de cambios importantes en el movimiento de la placa del Pacífico
Warren D Sharp1, David A Clague
1Berkeley Geochronology Center, 2455 Ridge Road, Berkeley, CA 94709, USA. wsharp@bgc.org
Resumen
La curva del emperador hawaiano.
Área de la Ciencia:
- La geofísica es la geofísica.
- La tectónica de placas es la tectónica de placas.
- Volcanología Volcanología.
Sus antecedentes:
- La curva Hawaiano-Emperador es una característica crítica para entender la historia del movimiento de la placa del Pacífico.
- Las interpretaciones anteriores sugirieron que la curva se formó debido a una desaceleración de un punto caliente hawaiano.
- El ritmo del cambio de movimiento de la placa ha sido objeto de debate.
Objetivo del estudio:
- Para reevaluar el mecanismo de formación de la curva Hawaiano-Emperador.
- Para investigar la relación entre las tasas de migración volcánica y la tendencia de la cadena.
- Para determinar si la curva fue el resultado del comportamiento de los puntos calientes o cambios en el movimiento de las placas.
Principales métodos:
- Datación de los volcanes en la cadena central y meridional del Emperador.
- Análisis de las tasas de migración volcánica.
- Correlación con la actividad del centro de propagación del Pacífico y el magmatismo del arco del Pacífico occidental.
Principales resultados:
- Las nuevas edades volcánicas revelan cambios significativos en las tasas de migración.
- Estos cambios de tasa se produjeron con una alteración mínima de la tendencia general de la cadena.
- La iniciación de la curva hace unos 50 millones de años coincidió con los reajustes del centro de expansión del Pacífico.
Conclusiones:
- La curva Hawaiian-Emperor no se formó debido a una desaceleración de un punto caliente hawaiano.
- La evidencia apoya la formación de la curva por un cambio en el movimiento de la placa del Pacífico.
- El tiempo se alinea con los eventos tectónicos en el Pacífico occidental.
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