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Los basaltos de doble inundación y la separación de las cabezas de penacho en la discontinuidad de 660 kilómetros
Science (New York, N.Y.)
|November 25, 1994
Resumen
Las columnas del manto pueden explicar los basaltos de doble inundación. Una cabeza de penacho se desprende, causando la primera erupción, mientras que el conducto restante causa una segunda erupción millones de años más tarde.
Área de la Ciencia:
- Geología Geología Geología.
- La geofísica es la geofísica.
- Ciencias de la Tierra Ciencias de la Tierra Ciencias de la Tierra
Sus antecedentes:
- Las provincias de basalto de inundación en todo el mundo exhiben dos grandes períodos de erupción separados por 20 a 90 millones de años.
- El fenómeno de los basaltos de doble inundación sugiere un proceso geológico recurrente.
Objetivo del estudio:
- Para investigar la dinámica del penacho del manto responsable de los eventos de doble inundación de basalto.
- Proporcionar una explicación mecanicista para la separación temporal observada entre sucesivas grandes provincias ígneas.
Principales métodos:
- Modelado teórico del comportamiento de la pluma del manto.
- Análisis de datos geológicos de las provincias de basalto de inundación conocidas.
Principales resultados:
- Una cabeza de pluma del manto puede separarse de su conducto en la zona de transición del manto.
- Este desprendimiento conduce a una erupción inicial de basalto de inundación.
- El conducto restante reforma una nueva cabeza de penacho, causando una erupción posterior.
Conclusiones:
- La separación y reformación de la cabeza del penacho del manto proporciona un modelo viable para los basaltos de doble inundación.
- El intervalo de tiempo predicho entre las erupciones se alinea con las observaciones geológicas.
- Este mecanismo ofrece información sobre eventos volcánicos a gran escala y la dinámica del manto.
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