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S-type granite generation and emplacement during a regional switch from extensional to contractional deformation (Central Iberian Zone, Iberian autochthonous domain, Variscan Orogeny)

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Abstract

Zircon grains extracted from S-type granites of the Mêda-Escalhão-Penedono Massif (Central Iberian Zone, Variscan Orogen) constrain the timing of emplacement and provide information about potential magma sources. Simple and composite zircon grains from three samples of S-type granite were analyzed by LA-ICP-MS. New U–Pb data indicate that granites crystallized in the Bashkirian (318.7 ± 4.8 Ma) overlapping the proposed age range of ca. 321–317 Ma of the nearby S-type granitic rocks of the Carrazeda de Anciães, Lamego and Ucanha-Vilar massifs. The timing of emplacement of such S-type granites seems to coincide with the waning stages of activity of a D2 extensional shear zone (i.e. Pinhel shear zone) developed in metamorphic conditions that reached partial melting and anatexis (ca. 321–317 Ma). Dykes of two-mica granites (resembling diatexite migmatite) are concordant and discordant to the compositional layering and S2 (main) foliation of the high-grade metamorphic rocks of the Pinhel shear zone. Much of the planar fabric in these dykes was formed during magmatic crystallization and subsequent solid-state deformation. Field relationships suggest contemporaneity between the ca. 319–317 Ma old magmatism of the study area and the switch from late D2 extensional deformation to early D3 contractional deformation. Inherited zircon cores are well preserved in these late D2-early D3 S-type granite plutons. U–Pb ages of inherited zircon cores range from ca. 2576 to ca. 421 Ma. The spectra of inherited cores overlap closely the range of detrital and magmatic zircon grains displayed by the Ediacaran to Silurian metasedimentary and metaigneous rocks of the Iberian autochthonous and parautochthonous domains. This is evidence of a genetic relationship between S-type granites and the host metamorphic rocks. There is no substantial evidence for the addition of mantle-derived material in the genesis of these late D2–early D3 S-type granitic rocks. The εNd arrays of heterogeneous crustal anatectic melts may be just inherited from the source, probably reflecting mixing of a range of crustal materials with different ages and primary isotopic signatures. The generation of the Bashkirian S-type granites has been dominated by continental crust recycling, rather than the addition of new material from mantle sources.

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(adapted from Martínez Catalán et al. 2007 and Díez Fernández and Arenas 2015)

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Acknowledgements

Funding was provided by Fundação para a Ciência e Tecnologia (Portugal) through research project PTDC/GEO–GEO/2446/2012: COMPETE: FCOMP-01-0124-FEDER-029192. Thanks are due to Prof. Neiva and Prof. Corfu for making available the heavy minerals concentrates. The authors thank Klaus Stanek (TU Bergakademie Freiberg) for CL imaging. Reviews by J.B. Brendan, J. Fernández-Suarez and an anonymous reviewer are kindly acknowledged.

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Authors and Affiliations

  1. Departamento de Geociências, ECT, Instituto D. Luiz, Universidade de Évora, Évora, Portugal

    M. F. Pereira

  2. Departamento de Geodinámica, Instituto de Geociencias (UCM, CSIC), Universidad Complutense de Madrid, 28040, Madrid, Spain

    R. Díez Fernández

  3. Departamento de Geociências, Instituto de Ciências da Terra de Évora, ECT, Universidade de Évora, Évora, Portugal

    C. Gama

  4. Senckenberg Naturhistorische Sammlungen Dresden, Museum für Mineralogie und Geologie, Dresden, Germany

    M. Hofmann, A. Gärtner & U. Linnemann

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  1. M. F. Pereira
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  2. R. Díez Fernández
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  3. C. Gama
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  4. M. Hofmann
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  5. A. Gärtner
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  6. U. Linnemann
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Correspondence to M. F. Pereira.

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Pereira, M.F., Díez Fernández, R., Gama, C. et al. S-type granite generation and emplacement during a regional switch from extensional to contractional deformation (Central Iberian Zone, Iberian autochthonous domain, Variscan Orogeny). Int J Earth Sci (Geol Rundsch) 107, 251–267 (2018). https://doi.org/10.1007/s00531-017-1488-3

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