A genetic link between albitic magmas and IOCG mineralization in the Ossa Morena Zone, SW Iberia

  1. Jorge Carriedo
  2. Fernando Tornos 1
  3. Massimo Chiaradia 2
  4. Carmen Galindo 1
  1. 1 Instituto de Geociencias
    info

    Instituto de Geociencias

    Madrid, España

    ROR https://ror.org/04qan0m84

  2. 2 Université de Genève
    info

    Université de Genève

    Ginebra, Suiza

    ROR https://ror.org/01swzsf04

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: 85-119

Tipo: Artículo

DOI: 10.1007/S41513-021-00162-3 DIALNET GOOGLE SCHOLAR lock_openAcceso abierto editor

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

Resumen

El estudio geológico y geocronológico de detalle del depósito de Colmenar (Zona de Ossa Morena, SO Ibérico) muestra que la mineralización de magnetita se formó por procesos magmático-hidrotermales relacionados con la intrusión de un magma inusual (albita + magnetita) y rico en agua generado por anatexia en un ambiente metamórfico de alta temperatura y baja presión. El protolito más probable se corresponde con una secuencia de sedimentos químicos ricos en hierro, anfibolitas, y probablemente meta-evaporitas del Cámbrico Inferior. Estas rocas ricas en albita y magnetita se encuentran como brechas magmáticas y diques de hasta 20 centímetros de espesor, y presentan complejas relaciones de inmiscibilidad con leucogranitos ricos en albita, feldespato potásico y cuarzo. Los fluidos enriquecidos en hierro y exsueltos durante la cristalización de estos magmas fueron responsables de la formación de brechas hidrotermales soportadas por una matriz de ferroactinolita y magnetita, que también aparecen junto con albita remplazando rocas de silicatos cálcicos a favor de bandas de cizalla. La geocronología de la mineralización y alteración hidrotermal indica una edad Varisca (ca. 340 Ma), que se interpreta, su vez, como la edad del metamorfismo de alto grado responsable de los procesos de fusión parcial en el Núcleo Metamórfico de Valuengo. A pesar de sus bajos contenidos en Cu y Au, este estilo de mineralización comparte características con los sistemas tipo IOCG, que en otros distritos muestra relaciones espaciales con albititas, evaporitas, y mineralizaciones de hierro preexistentes.Las observaciones en Colmenar soportan un modelo genético alternativo con implicaciones prospectivas para la zona de Ossa Morena, y que es extrapolable a distritos IOCG en otras partes del mundo.

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