Isotopic and geochemical record of the active to passive margin transition in NW Iberia during the Cambrian-Ordovicianvestiges of a waning continental arc

  1. Pilar Andonaegui 1
  2. Rubén Díez Fernández 2
  3. Jacobo Abati 1
  1. 1 Universidad Complutense de Madrid
    info

    Universidad Complutense de Madrid

    Madrid, España

    ROR 02p0gd045

  2. 2 Instituto Geológico y Minero de España
    info

    Instituto Geológico y Minero de España

    Madrid, España

    ROR https://ror.org/04cadha73

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: 323-346

Tipo: Artículo

DOI: 10.1007/S41513-020-00155-8 DIALNET GOOGLE SCHOLAR lock_openAcceso abierto editor

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

Resumen

Los datos geoquímicos de los ortogneises de las Unidades Basales de los Complejos Alóctonos del NW del Macizo Ibérico, permiten seguir a lo largo del tiempo los cambios producidos en la composición de los magmas generados en una zona de subducción relacionada con un margen continental, la cual evoluciona desde la construcción de un arco volcánico hasta su desmantelamiento durante un episodio de rifting. Las Unidades Basales se interpretan como una sección periférica del margen Norte Africano de Gondwana y registran un magmatismo de arco volcánico de edad Neoproterozoica a Cámbrica, seguido por un episodio de rifting Cambro-Ordovícico. Las rocas intrusivas de las Unidades Basales, conservadas como ortogneises, se pueden agrupar en dos suites magmáticas: una calco-alcalina (c. 493-475 Ma) y otra que varía de alcalina a per-alcalina (c. 475-470 Ma). La asociación calco-alcalina tiene una composición química que varía de tipos meta-alumínicos magnésico cálcicos a ferro calco-alcalinos y tipos peralumínicos alcalino-cálcicos. Los metagranitos de la asociación moderadamente alcalina se clasifican como ferro alcalinos meta-alumínicos a per-alumínicos, y los per-alcalinos son ferro alcalinos a alcalino- cálcicos de per-alcalinos a moderadamente per-alumínicos. Las características químicas de las rocas metaígneas de las Unidades Basales indican que los términos más antiguos de la suite calco-alcalina (tonalitas y granodioritas) se formaron en un arco continental, mientras que las rocas alcalinas y per-alcalinas se generaron en un contexto extensional intraplaca. Los valores negativos de ƐNd (-7.8 a -1.5) de la serie calco-alcalina sugieren una influencia cortical en su génesis. En los ortogneises alcalinos los valores de ƐNd varían entre -2.0 y 2.2, siendo siempre positivos en el grupo de ortogneises peralcalinos, lo cual sugiere una mayor participación de un componente mantélico en los magmas de los que proceden. La transición de la suite calco-alcalina a la suite alcalina está representada por los granitos alcalinos, estos son coetáneos con la intrusión de magmas básicos que probablemente derivan de un magma mantélico estancado en la base de la corteza que provocó el episodio de rifting después del cese del magmatismo de arco continental durante el Ordovícico.

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