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Rapido desplazamiento de una fuente magmática profunda en el volcán Fagradalsfjall, Islandia
Sæmundur A Halldórsson1, Edward W Marshall2, Alberto Caracciolo2
1Nordic Volcanological Center, Institute of Earth Sciences, University of Iceland, Reykjavík, Iceland. saemiah@hi.is.
Nature
|September 14, 2022
Resumen
La erupción de Fagradalsfjall de 2021 reveló una rápida mezcla de magma en Islandia
Área de la Ciencia:
- Geoquímica
- Petrología
- Volcanología
Sus antecedentes:
- Los eventos de fisuras islandesas destacan los depósitos de magma de la corteza y el transporte lateral.
- El procesamiento de magma de corteza superficial puede oscurecer el origen del manto y las firmas de evolución.
Objetivo del estudio:
- Para investigar los procesos de magma en el manto superior y la corteza inferior.
- Analizar la erupción de Fagradalsfjall de 2021 utilizando métodos petrológicos y geoquímicos integrados.
Principales métodos:
- Análisis geoquímicos de basaltos en erupción durante 50 días.
- Análisis de las emisiones de gases volcánicos asociados.
- Estudios petrológicos y geoquímicos integrados.
Principales resultados:
- Las lavas en erupción se obtuvieron directamente de una zona de almacenamiento de magma cercana a la discontinuidad de Mohorovičić (Moho).
- Los proxies geoquímicos mostraron cambios rápidos sin precedentes, lo que indica un cambio de fuentes de magma de manto poco profundas a más profundas en tres semanas.
- La evidencia sugiere una mezcla extensa de magma dentro de una gran lente de fusión cerca de Moho.
Conclusiones:
- La erupción de Fagradalsfjall proporciona un registro único y casi en tiempo real de la dinámica del sistema de magma.
- Los rápidos cambios de composición revelan el filtrado de las señales del manto por el procesamiento de magma poco profundo.
- Se obtuvieron información sobre las escalas de tiempo y los modos operativos de los sistemas de magma basáltico.
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