The importance of sequential partial melting and fractional crystallization in the generation of syn‑D3 Variscan two‑mica granites from the Carrazeda de Ansiães area, northern Portugal

  1. R. J. S. Teixeira 1
  2. A. M. R. Neiva 2
  3. M. E. P. Gomes 1
  4. F. Corfu 3
  5. A. Cuesta 4
  6. I. W. Croudace 5
  1. 1 University of Trás-os-Montes e Alto Douro
  2. 2 Universidade de Coimbra
    info

    Universidade de Coimbra

    Coímbra, Portugal

    ROR https://ror.org/04z8k9a98

  3. 3 University of Oslo
    info

    University of Oslo

    Oslo, Noruega

    ROR https://ror.org/01xtthb56

  4. 4 Universidad de Oviedo
    info

    Universidad de Oviedo

    Oviedo, España

    ROR https://ror.org/006gksa02

  5. 5 University of Southampton
    info

    University of Southampton

    Southampton, Reino Unido

    ROR https://ror.org/01ryk1543

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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: 281-305

Tipo: Artículo

DOI: 10.1007/S41513-020-00160-X DIALNET GOOGLE SCHOLAR lock_openAcceso abierto editor

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

Resumen

En la región de Carrazeda de Ansiães, norte de Portugal, rocas metasedimentarias de edad Precámbrico y Ordovícico han sido intruídas por una suite granítica mesozonal durante las etapas tardi-cinemáticas de la orogenia Varisca. En esta suite se distinguen diez tipos de granitos en que los más jóvenes, constituidos por granitos de dos micas (G7–G10), se emplazan entre 318 ± 1 Ma y 316.2 ± 0.7 Ma, de acuerdo con dataciones U–Pb ID-TIMS en circón y monacita. Los granitos G7–G9 han sido afectados por la tercera fase de deformación ( D3) antes de su consolidación completa, como sugiere su foliación magmática interna NW–SE concordante con las estructuras regionales. El granito G10 tiene algunas características texturales distintivas, propias de una fuerte deformación frágil, probablemente debidas a su emplazamiento preferente en zonas de fallas tardías con dirección NNE-SSW. Los granitos G7–G9 tienen cantidades de moscovita iguales o mayores que las de biotita y contienen enclaves “surmicaceous”, xenolitos, “schlieren” y, raras veces, enclaves microgranudos. El granito G10 predominantemente moscovítico no contiene enclaves. Estos granitos variscos son peralumínicos, con valores de ASI entre 1.22 y 1.39, y de corindón normativo entre 2.79–4.39%, y presentan características típicas de granitos de tipo S. De hecho, el enriquecimiento en LREE con respecto a las HREE, las anomalías negativas de Eu y valores medios similares de (87Sr/86Sr)i, εNdt y δ18O para G7 (0.7156 ± 0.0005; − 8.5; 11.49 ‰) y G8 (0.7155 ± 0.0007; − 8.4; 11.39 ‰) muestran que estos dos tipos de granito son el producto de la fusión parcial secuencial del mismo material metasedimentario, y que el granito G8 correspondería a una mayor tasa de fusión parcial que el granito G7. Los granitos G8–G10 y sus minerales muestran una evolución por fraccionación que se puede confirmar mediante la modelización de elementos mayores y traza. Los espectros de REE subparalelos y la disminución de sus contenidos con la diferenciación, la isócrona Rb–Sr para G8, G9 y G10 (315.5 ± 5.4 Ma; MSWD = 1.3) y los valores relativamente uniformes de εNdt y δ18O sugieren que la cristalización fraccionada ha sido el principal mecanismo implicado, y habría tenido una duración inferior a 1 Ma. Los granitos especializados estanníferos G7 y G10 tienen contenidos de Sn ≥ 20 ppm, pero los principales filones de cuarzo con casiterita y wolframita cortan al granito G10, que contiene 31 ppm de Sn. La cristalización fraccionada ha sido responsable del aumento del contenido de Sn en los granitos de la serie G8–G10 y de sus micas.

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Información de financiación

Financiadores

  • EU SOCFAC facility
    • HPRI-1999-CT-00108
  • PhD grant from FCT - Fundação para a Ciência e a Tecnologia, Portugal
    • SFRH/BD/17246/2004
  • Pole of the Geosciences Centre (CGeo) through FCT - Portuguese Foundation for Sciences and Technology
    • Projects UIDB/00073/2020
    • Projects UIDP/00073/2020

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Fuente de los datos: Dialnet