Petrology of the Porriño late-Variscan pluton from NW Iberia. A model for post-tectonic plutons in collisional settings


  • L. GONZÁLEZ-MENÉNDEZ Instituto Geológico y Minero de España (IGME) Avda. Real 1, 24006, León, Spain.
  • G. GALLASTEGUI Instituto Geológico y Minero de España (IGME) Avda. Real 1, 24006, León, Spain.
  • A. CUESTA Department of Geology, University of Oviedo C/ Jesús Arias de Velasco s/n, 33005 Oviedo, Spain.
  • P. MONTERO Department of Mineralogy and Petrology, University of Granada, Campus Fuentenueva 18002, Granada, Spain.
  • A. RUBIO-ORDÓÑEZ Department of Geology, University of Oviedo C/ Jesús Arias de Velasco s/n, 33005 Oviedo, Spain.
  • J.F. MOLINA Department of Mineralogy and Petrology, University of Granada, Campus Fuentenueva 18002, Granada, Spain.
  • F. BEA Department of Mineralogy and Petrology, University of Granada, Campus Fuentenueva 18002, Granada, Spain.



Post-orogenic magmatism, Variscan orogen, Postectonic granites, Monzogranites, Enclaves


The Variscan orogen of NW Iberia contains abundant syn- and post-tectonic granitoids. The post-tectonic granitoids are metaluminous to slightly peraluminous, I-type granites, monzogranites ± granodiorites ± tonalites. The Porriño pluton studied here is a representative example. It consists of two units: i) a pink-red, peraluminous, biotite granite and ii) a gray, metaluminous to peraluminous, biotite (± amphibole ± titanite) monzogranite, including maficintermediate enclaves. SHRIMP U-Pb dating yielded 290-295Ma ages for all the units. The mineralogy and geochemistry show that the pink-red granite has features of I- and A-type granites, whereas the gray monzogranite and enclaves are I-types. Sr isotopes show scattered values for the pink-red granite (87Sr/86Sr295Ma ≈ 0.702-0.710) and uniform values for the gray monzogranite and enclaves (87Sr/86Sr295Ma≈ 0.705-0.706). Geochemical results indicate a peritectic entrainment of clinopyroxene + orthopyroxene ± Ca-plagioclase ± ilmenite ± garnet, and minor accessory phases (± zircon ± titanite ± apatite) into a melt similar to the leucocratic gray monzogranite. A mafic-intermediate source is proposed for the gray monzogranite and its enclaves. Restitic protoliths generated granitic melts with A-type features such as the pink-red granite. The I-type nature of many post-tectonic granitoids could be explained by the previous extraction of S-type syn-tectonic granites that left restites and less fertile rocks. Late orogenic new melting affected the previously unmelted and more mafic lithologies of the lower-middle crust, and gave rise to I-type granitoids. Repeated melting events affecting such lithologies and previous restites could have generated granitic melts with A-type features.


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