Trace element fractionation in water-bearing silicic magmas

  1. Carmen Rodríguez 1
  2. Antonio Castro 2
  3. Antonio Sánchez Navas 3
  1. 1 Consejo Superior de Investigaciones Científicas
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    Consejo Superior de Investigaciones Científicas

    Madrid, España

    ROR https://ror.org/02gfc7t72

  2. 2 Instituto Andaluz de Ciencias de la Tierra
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    Instituto Andaluz de Ciencias de la Tierra

    Granada, España

    ROR https://ror.org/00v0g9w49

  3. 3 Universidad de Granada
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    Universidad de Granada

    Granada, España

    ROR https://ror.org/04njjy449

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Revista:
Journal of iberian geology: an international publication of earth sciences

ISSN: 1886-7995,  1698-6180

Año de publicación: 2021

Título del ejemplar: New developments in Geochemistry. A tribute to Carmen Galindo

Volumen: 47

Número: 1-2

Páginas: 263-279

Tipo: Artículo

DOI: 10.1007/S41513-020-00153-W DIALNET GOOGLE SCHOLAR lock_openAcceso abierto editor

Otras publicaciones en: Journal of iberian geology: an international publication of earth sciences

Resumen

La cristalización de una andesita hidratada dentro de una capa límite térmica a 500 MPa de presión se simula experimentalmente usando el gradiente térmico intrínseco en las cápsulas de 10 mm de longitud dentro de un piston-cylinder en posición horizontal. La solidificación del magma se programó con dos tasas de enfriamiento distintas, lenta (0.6 °C/hora) y rápida (9.6 °C/hora). Los análisis con ablación láser (LA-ICP-MS) a lo largo del gradiente térmico nos dan información acerca de la eficiencia de la fraccionación en elementos traza, para un enfriamiento lento, en el que los fluidos ricos en agua favorecen la movilidad de ciertos elementos. Las características composicionales y texturales de nuestros experimentos proporcionan nuevos avances sobre la cinética de la fraccionación de los elementos traza en magmas intermedios con agua. Estas características, junto con los irreales valores de difusión medidos en las cápsulas (cercanos a 10– 6 cm2s− 1), indican que los elementos incompatibles migran conjuntamente con una fase fluida rica en agua, expulsada desde un entramado rico en cristales o mush, a través del efecto filtro prensa asistido por gas. En el caso aquí estudiado, el transporte difusivo impuesto por el gradiente de concentración de los elementos químicos tiene lugar en el mismo sentido que el de tipo advectivo. Se propone que la segregación del líquido es particularmente efectiva en capas límite térmicas originadas en los márgenes de los conductos de ascenso o en las paredes de las cámaras magmáticas. El flujo de un fluido rico en elementos traza hacia áreas pobres en cristales y más calientes, en las zonas centrales o superiores de las cámaras magmáticas, dan como resultado una zonación composicional y, eventualmente, a la formación de cúpulas fraccionadas, lugares preferenciales para la generación de depósitos de menas.

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