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La volcanidad peralcalina en el margen de la cuenca de Eurasia

D J Batten, P E Brown, P R Dawes

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    Nuevas pruebas confirman rocas volcánicas peralcalinas del final del Cretácico en Groenlandia. Estas rocas del Grupo Kap Washington probablemente se formaron en una grieta continental, no en el punto caliente de Yermak, ayudando a las reconstrucciones tectónicas del Ártico.

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    Área de la Ciencia:

    • Geología
    • Geoquímica
    • Tectónica

    Sus antecedentes:

    • Las rocas volcánicas del Grupo Kap Washington en el norte de Groenlandia, descubiertas en 1969, han sido fundamentales para los modelos geotectónicos del Ártico.
    • Las interpretaciones anteriores vinculaban estas rocas con el punto caliente de Yermak y la abertura de la cuenca de Eurasia.

    Objetivo del estudio:

    • Para aclarar la edad y la naturaleza química de las rocas volcánicas del grupo Kap Washington.
    • Reevaluar su entorno geotectónico y su relación con la tectónica de placas árticas.

    Principales métodos:

    • Análisis geoquímico de muestras de rocas volcánicas.
    • La datación geocronológica para determinar la edad de la volcanidad.
    • Modelado tectónico para evaluar diferentes hipótesis de origen.

    Principales resultados:

    • El volcanismo del Grupo Kap Washington está confirmado como de finales del Cretácico.
    • Las rocas se caracterizan por una firma química peralcalina.
    • Se considera improbable un vínculo genético directo con el punto caliente de Yermak.

    Conclusiones:

    • Las rocas del Grupo Kap Washington se originaron en un entorno de grieta extensional continental.
    • Este volcanismo es anterior a la ruptura de la placa Laurasiana en el Ártico.
    • Los hallazgos proporcionan restricciones de edad cruciales para eventos tectónicos del Ártico poco comprendidos.