The Mg/(Fe + Mg) ratio and the Ti and A site contents of tourmaline as promising indicators of granitic magma evolution

  1. Isabel Ribeiro da Costa 1
  2. Isabel Margarida Horta Ribeiro Antunes 2
  3. Clemente Récio 3
  1. 1 Universidade de Lisboa
    info

    Universidade de Lisboa

    Lisboa, Portugal

    ROR https://ror.org/01c27hj86

  2. 2 Universidade do Minho
    info

    Universidade do Minho

    Braga, Portugal

    ROR https://ror.org/037wpkx04

  3. 3 Universidad de Salamanca
    info

    Universidad de Salamanca

    Salamanca, España

    ROR https://ror.org/02f40zc51

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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: 307-321

Tipo: Artículo

DOI: 10.1007/S41513-020-00158-5 DIALNET GOOGLE SCHOLAR lock_openAcceso abierto editor

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

Resumen

Trabajos recientes sobre turmalinas en rocas graníticas de la Zona Centro Ibérica (CIZ) del orógeno Varíscico han demostrado que la composición de las turmalinas puede ser una guía útil que ayude a determinar el grado de evolución y la fugacidad de oxígeno de los granitoides en que se encuentran. Esto, unido a otras investigaciones que fundamentan el empleo de las turmalinas como indicador petrogenético en pegmatitas, y en la mineralización a ellas asociada, nos ha animado a investigar si semejantes consideraciones son también aplicables a granitoides con turmalina en otros contextos geotectónicos, complementando los datos químicos con datos de isótopos estables en roca total. Los datos evaluados indican que si bien la mayoría de elementos y relaciones elementales determinadas en las turmalinas parece ser insensibles a la composición del magma, y a su fugacidad de oxígeno, hay algunas excepciones importantes, entre las que destaca la relación Mg/(Mg + Fe) y el contenido en Ti de la turmalina, que se modifican claramente a medida que cambia el grado de evolución y la fugacidad de oxígeno. Desde una perspectiva mineralógica y petrológica, parecería que las características composicionales de la turmalina pueden utilizarse como indicadores del grado de evolución y de otras características específicas del granito en que se encuentran.

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Fuente de los datos: Dialnet