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La aparición simultánea y las causas de las pistas de puntos calientes volcánicos dobles en la placa del Pacífico
T D Jones1, D R Davies1, I H Campbell1
1Research School of Earth Sciences, The Australian National University, Canberra, Australian Capital Territory, Australia.
Nature
|May 4, 2017
Resumen
El volcanismo de doble vía hawaiano, impulsado por plumas de manto, se explica por cambios en el movimiento de la placa del Pacífico. Este modelo revela cómo la inclinación de las plumas y el movimiento de las placas crean distintos tipos de lava geoquímica, ofreciendo información sobre la tectónica de placas.
Área de la Ciencia:
- La geofísica
- Geoquímica
- Tectónica de placas
Sus antecedentes:
- Las columnas del manto causan volcanismo independiente de la tectónica de placas.
- La cadena Hawaiian-Emperor exhibe huellas volcánicas duales inexplicables (Loa y Kea) con una geoquímica distinta.
Objetivo del estudio:
- Para explicar el origen de las dos huellas volcánicas en Hawai.
- Para vincular la aparición de dos pistas volcánicas con el movimiento de la placa del Pacífico.
Principales métodos:
- Desarrolló un modelo en tres partes para el volcanismo de doble vía hawaiano.
- Analizó el flujo del manto, la inclinación del penacho y la dinámica del movimiento de la placa.
- Diferencias geoquímicas investigadas relacionadas con las regiones de origen del derretimiento.
Principales resultados:
- Los cambios en el movimiento de la placa del Pacífico inclinan el penacho hawaiano, separando las fuentes de fusión.
- El movimiento alterado de las placas expone distintos productos de fusión, formando pistas dobles a través del Pacífico.
- La piroxena secundaria en la región de fusión a baja presión explica la geoquímica de la pista de Loa.
Conclusiones:
- El volcanismo de doble vía hawaiano es un fenómeno transitorio.
- La formación de pistas dobles proporciona un método para datar los cambios en el movimiento de la placa.
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