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Una fuente joven para el penacho hawaiano.

Alexander V Sobolev1, Albrecht W Hofmann, Klaus Peter Jochum

  • 1ISTerre, University Joseph Fourier, Grenoble 1 and CNRS, BP 53, 38041 Grenoble, France. alexander.sobolev@ujf-grenoble.fr

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Resumen

El vulcanismo de las islas oceánicas implica el reciclaje de la corteza oceánica. Los nuevos datos de isótopos de estroncio de las lavas hawaianas revelan la contaminación del agua de mar, lo que sugiere que las tasas de circulación del manto son más rápidas de lo que se estimaba anteriormente.

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Área de la Ciencia:

  • La geoquímica es la geoquímica.
  • Geoquímica de isótopos La geoquímica de isótopos es la química de los isótopos.
  • Petrología del manto Petrología del manto

Sus antecedentes:

  • El vulcanismo de las islas oceánicas se explica por el reciclaje de la corteza oceánica a través de la subducción y las plumas del manto.
  • La datación de este reciclaje es crucial para comprender las tasas de circulación del manto.
  • Los métodos de datación anteriores que utilizan isótopos de plomo y Re-Os tienen limitaciones debido a la mezcla y la movilidad del renio.

Objetivo del estudio:

  • Para investigar la escala de tiempo del reciclaje de la corteza oceánica en plumas del manto.
  • Para determinar la edad de la corteza oceánica subducida que contribuye al volcanismo hawaiano.
  • Para refinar las estimaciones de las tasas de circulación del manto.

Principales métodos:

  • Análisis de las proporciones de estroncio-87/estroncio-86 ((87) Sr/(86) Sr) en 138 inclusiones de fusión de fenocristales de olivina de Mauna Loa.
  • Comparación de composiciones isotópicas con agua de mar y antiguas firmas de la corteza.
  • Modelado de datos isotópicos para inferir la contaminación de la fuente y la edad.

Principales resultados:

  • Se identificó una enorme heterogeneidad de fuentes de manto en las lavas de Mauna Loa.
  • El estroncio altamente radiogénico en las inclusiones de fusión agotadas coincide con el agua de mar de 200-650 millones de años.
  • Esto indica la contaminación del agua de mar de la roca fuente de Mauna Loa antes de la subducción.

Conclusiones:

  • La contaminación del agua de mar proporciona una 'marca de tiempo' para la corteza oceánica subducida.
  • La presencia de una corteza oceánica de entre 200 y 650 millones de años de antigüedad implica una circulación más rápida del manto.
  • Las tasas promedio de circulación del manto se estiman en aproximadamente 2 (±1) cm / año, más rápido de lo que se pensaba anteriormente.