Age of the basement beneath the Mesozoic Lusitanian Basin revealed by granitic xenoliths from the Papôa volcanic breccia (West Iberia)
DOI:
https://doi.org/10.1344/GeologicaActa2020.18.16Keywords:
Pyroclastic breccia, Xenoliths, Granitic rocks, U-Pb zircon datingAbstract
The dyke of the Papôa volcanic breccia cross-cutting the Lower Jurassic sequence of the Lusitanian Basin (West Iberia) contains granitic xenoliths. In this study, for the first time, U-Th-Pb zircon analysis of two xenoliths yielded 298±4Ma for biotite granite and of 292±2Ma for two-mica granite, indicating that the pre-Mesozoic basement of the Lusitanian Basin includes Permian intrusions. These ages are close within the margin of error of the age of the Late Carboniferous granites of the Berlengas isle that with the Late Devonian high-grade metamorphic rocks of the Farilhões isles, located northwest of the study area, which form the pre-Mesozoic basement of the Lusitanian Basin. These new geochronological findings enable it to be established that Permo-Carboniferous magmatism lasted at least 13Ma, in this region of the Appalachian-Variscan belt. Furthermore, a comparison with available data from Paleozoic tectonic units of the Appalachian-Variscan belt located both in the Iberian Massif and outside it enables the suggestion to be made that the Lusitanian Basin (Peniche) most probably rests on the South Portuguese Zone, which may also be correlated with the Rhenohercynian Zone present in southwest England, and the Meguma terrane of Nova Scotia.
References
Alves, T.M., Manuppella, G., Gawthorpe, R.L., Hunt, D.W., Monteiro, J.H., 2003. The depositional evolution of diapir- and fault-bounded rift basins: examples from the Lusitanian Basin of West Iberia. Sedimentary Geology, 162, 273-303.
Alves, S.L., 2011. Contribuição dos métodos potenciais para os estudos tectónicos regionais na Margem Continental Ibérica Ocidental. Boletim Geociências Petrobras, 19(1-2), 53-68.
Andrade, M.M., 1979. O tufo-brecha da Papôa: resto dum cone vulcânico de piroclastitos? Publicações do Museu e Laboratório Mineralógico e Geológico da Faculdade de Ciências do Porto, XCI, 4ª série, 214-222.
Azor, A., Dias da Silva, Í., Gómez Barreiro, J., González-Clavijo, E., Martínez Catalán, J.R., Simancas, J.F., Martínez Poyatos, D., Pérez-Cáceres, I., González Lodeiro, F., Expósito, I., Casas, J.M., Clariana, P., García-Sansegundo, J., Margalef, A., 2019. Deformation and Structure. In: Quesada, C., Oliveira, J.T. (eds.). The Geology of Iberia: A Geodynamic Approach. Volume 2: The Variscan Cycle. Springer International Publishing, 307-348.
Bento dos Santos, T., Ribeiro, M.L., Clavijo, E., Díez Montes, A., Solá, A.R., 2010. Estimativas geotermobarométricas e percursos P-T de migmatitos dos Farilhões, Arquipélago das Berlengas, Oeste de Portugal. e-Terra. Revista Eletrónica de Ciências da Terra, 16(11), Extended abstract, 4.
Black, L.P., Kamo, S.L., Allen, C.M., Aleinikoff, J.A., Davis, D.W., Korsch, J.R., Foudolis, C., 2003. TEMORA 1: a new zircon standard for Phanerozoic U-Pb geochronology. Chemical Geology, 200, 155-170.
Braid, J.A., Murphy, J.B., Quesada, C., Bickerton, L., Mortensen, J.K., 2012. Probing the composition of unexposed basement,
South Portuguese Zone, Southern Iberia: implications for the connections between the Appalachian and Variscan orogens.
Canadian Journal of Earth Sciences, 49, 591-613.
Camarate França, J., Zbyszewski, G., Almeida, F.M., 1960. Carta Geológica de Portugal na escala 1/50000, folha 26-C (Peniche). Serviços Geológicos de Portugal.
Capdevilla, R., Mougenot, D., 1988. Pre-Mesozoic basement of the Western Iberian continental margin and its place in the
Variscan Belt. In: Boillot, G., Winterer, E.L., Meyer, A.W., and Shipboard Scientific party (eds.). Proceedings of the Ocean Drilling Program. Scientific results, 103, 3-12.
Castro, A., Corretgé, L.G., De La Rosa, J., Enrique, P., Martínez, F.J., Pascual, E., Lago, M., Arranz, E., Galé, C., Fernández, C., Donaire, T., López, S., 2002. Paleozoic magmatism. In: Gibbons, W., Moreno, M.T. (eds.). The Geology of Spain. London, Geological Society, 117-153.
Chesley, J.T., Halliday, A.N., Snee, L.W., Mezger, K., Shepherd, T.J., Scrivener, R.C., 1993. Thermochronology of the Cornubian
Batholith in southwest England: implications for pluton emplacement and protracted hydrothermal mineralisation. Geochimica et Cosmochimica Acta, 57, 1817-1835.
Choffat, P.L., 1880. Étude stratigraphique et paléontologique des terrains jurassiques du Portugal. Première livraison- Le Lias et le Dogger au Nord du Tage. Memórias Secções Trabalhos Geológicos de Portugal, 22, 72pp.
Claoué-Long, J.C., Compston, W., Roberts, J., Fanning, C.M., 1995. Two Carboniferous ages: a comparison of SHRIMP zircon
dating with conventional zircon ages and 40Ar/39Ar analyses. In: Berggren, W.A., Kent, D.V., Aubry, M.-P., Hardenbol, J. (eds.). Geochronology, Time Scales and Global Stratigraphic Correlation. SEPM (Society of Sedimentary Petrology), 54 (Special Publication), 3-21.
Clark, A.H., Chen, Y., Farrar, E., Northcote, B., 1994. Refinement of the time-space relationships of intrusion and hydrothermal activity in the Cornubian Batholith. Proceedings of the Ussher Society, Abstract, 345.
Clarke, D.B., MacDonald, M.A., Tate, M.C., 1997. Late Devonian Mafic-felsic Magmatism in the Meguma Zone, Nova Scotia.
In: Sinha, A.K., Whalen, J.B., Hogan, J.P. (eds.). The Nature of Magmatism in the Appalachian Orogen. Geological Society of America Memoir, 191, 107-127.
Clarke, D.B., MacDonald, M.A., Reynolds, P.H., Longstaffe, F.J., 2003. Leucogranites from the eastern part of the South Mountain Batholith, Nova Scotia. Journal of Petrology, 34, 653-679.
Colmenar, J., Pereira, S., Sá, A.A., da Silva, C.M., Young, T.P., 2017. The highest-latitude Foliomena Fauna (Upper Ordovician, Portugal) and its palaeogeographical and palaeoecological significance. Palaeogeography, Palaeoclimatology, Palaeoecology, 485, 774-783.
Corfu, F., Hanchar, J.M., Hoskin, P.W.O., Kinny, P., 2003. Atlas of Zircon Textures. Reviews in Mineralogy and Geochemistry, 53, 468-500.
Cumming, G.L., Richards, J.R., 1975. Ore lead isotope ratios in a continuously changing earth. Earth Planetary Science Letters, 28, 155-171.
De la Rosa, J.D., Jenner, G.A., Castro, A., 2002. A study of inherited zircon in granitoid rocks from the South Portuguese and OssaMorena Zones, Iberian Massif: support for the exotic origin of the South Portuguese Zone. Tectonophysics, 352, 245-256.
Dias da Silva, Í., Pereira, M.F., Silva, J.B., Gama, C., 2018. Timespace distribution of silicic plutonism in a gneiss dome of the
Iberian Variscan Belt: The Évora Massif (Ossa-Morena Zone, Portugal). Tectonophysics, 747-748, 298-317.
Dias da Silva, Í., Jensen, S., González Clavijo, E., 2014. Trace fossils from the Desejosa Formation (Schist and Greywacke Complex, Douro Group, NE Portugal): new Cambrian age constraints. Geologica Acta, 12(2), 109-120.
Dias da Silva, Í., Díez Fernández, R., Díez-Montes, A., González Clavijo, E., Foster, D.A., 2016. Magmatic evolution in the N-Gondwana margin related to the opening of the Rheic Ocean-evidence from the Upper Parautochthon of the GaliciaTrás-os-Montes zone and from the Central Iberian zone (NW Iberian Massif). International Journal of Earth Sciences, 105, 1127-1151.
Díez Fernández, R., Pereira, M.F., 2017. Strike-slip shear zones of the Iberian Massif: Are they coeval? Lithosphere Lithosphere 9(5), 726-744.
Díez Fernández, R., Pereira, M.F., Foster, D.A., 2015. Peralkaline and alkaline magmatism of the Ossa-Morena zone (SW Iberia): age, source, and implications for the Paleozoic evolution of Gondwanan lithosphere. Lithosphere, 7, 73-90.
Díez Montes, A., Valverde-Vaquero, P., Rey-Moral, C., Sánchez Garcia, T., 2017. Late Variscan, Permo-Carboniferous, Al-K plutonism in the South Portuguese Zone: El Crispinejo cordierite-bearing granite, Geologica Acta, 15(4), 429-442.
Doig, R., Murphy, J.B., Pe-Piper, G., Piper, D.J.W., 1996. U-Pb geochronology of Late Palaeozoic plutons, Cobequid Highlands, Nova Scotia, Canada: evidence for Late Devonian emplacement adjacent to the Meguma-Avalon terrane boundary in the Canadian Appalachians. Geological Journal, 31, 179-188.
Domeier, M., Torsvik, T.H., 2014. Plate tectonics in the late Paleozoic. Geoscience Frontiers, 5, 303-350.
Don Hermes, O., Murray, D.P., 1988. Middle Devonian to Permian plutonism and volcanism in the N American Appalachians. London, Geological Society, 38 (Special Publications), 559-571.
Dostal, J., Keppie, J.D., Hamilton, M.A., Aarab, E.M., Lefort, J.P., Murphy, J.B., 2005. Crustal xenoliths in Triassic lamprophyre
dykes in western Morocco: tectonic implications for the Rheic Ocean suture. Geological Magazine, 142(2), 159-172.
Duarte, L.V., Soares, A.F., 2002. Litostratigrafia das séries margocalcárias do Jurássico inferior da Bacia Lusitânica (Portugal). Comunicações Instituto Geológico e Mineiro, 89, 135-154.
Duarte, L.V., Wright, V.P., Fernández-López, S., Elmi, S., Krautter, M., Azerêdo, A.C., Henriques, M.H., Rodrigues, R., Perilli, N., 2004. Early Jurassic carbonate evolution in the Lusitanian Basin: facies, sequence stratigraphy and cyclicity. In: Duarte, L.V., Henriques, M.H. (eds.). Carboniferous and Jurassic Carbonate Platforms of Iberia. 23rd IAS Meeting of Sedimentology, Coimbra. Field Trip Guide Book, Volume I, 45-71.
Duarte, L.V., 2007. Lithostratigraphy, sequence stratigraphy and depositional setting of the Pliensbachian and Toarcian series in the Lusitanian Basin (Portugal). In: Rocha, R.B. (ed.). The Peniche section (Portugal). Contributions to the definition of the Toarcian GSSP, International Subcommission on Jurassic Stratigraphy, 17-23.
Dupuis, N.E., Braid, J.A., Murphy, J.B., Shail, R.K., Archibald, D.A., Nance, R.D., 2015. 40Ar/39Ar phlogopite geochronology of lamprophyre dykes in Cornwall, UK: new age constraints on Early Permian post-collisional magmatism in the Rhenohercynian Zone, SW England. Journal of the Geological Society, 172, 566-580.
Fernández-Suárez, J., Gutiérrez-Alonso, G., Johnston, S.T., Jeffries, T.E., Pastor-Galan, D., Jenner, G.A., Murphy, J.B., 2011. Iberian late-Variscan granitoids: Some considerations on crustal sources and the significance of “mantle extraction ages”. Lithos, 123, 121-132.
Freire de Andrade, C., 1937. Os Vales Submarinos Portugueses e o Diastrofismo das Berlengas e da Estremadura. Serviços Geológicos de Portugal, 235pp.
Gladney, E.R., Braid, J.A., Murphy, J.B., Quesada, C., McFarlane, C.R.M., 2014. U–Pb geochronology and petrology of the Late Paleozoic Gil Márquez pluton: magmatism in the Variscan suture zone, southern Iberia, during continental collision and the amalgamation of Pangea. International Journal of Earth Sciences, 103, 1433-1451.
Grange, M., Scharer, U., Comen, G., Girardeau, J., 2008. First alkaline magmatism during Iberia-Newfoundland rifting. Terra Nova, 20, 494-503.
Greenough, J.D., Krogh, T.E., Kamo, S.L., Owen, J.V., Ruffman, A., 1999. Precise U-Pb dating of Meguma basement xenoliths:
new evidence for Avalonian underthrusting. Canadian Journal of Earth Sciences, 36, 15-22.
Gutiérrez-Alonso, G., Collins, A.S., Fernández-Suárez, J., Pastor-Galán, D., González-Clavijo, E., Jourdan, F., Weil, A.B., Johnston, S.T., 2015. Dating of lithospheric buckling: 40Ar/39Ar ages of syn-orocline strike-slip shear zones in northwestern Iberia. Tectonophysics, 643, 44-54.
Gutiérrez-Marco, J.C., Piçarra, J.M., Meireles, C.A., Cózar, P., García-Bellido, D.C., Pereira, Z., Vaz, N., Pereira, S., Lopes, G., Oliveira, J.T., Quesada, C., Zamora, S., Esteve, J., Colmenar, J., Bernárdez, E., Coronado, I., Lorenzo, S., Sá, A.A., Dias da Silva, Í., González-Clavijo, E., Díez-Montes, A., GómezBarreiro, J., 2019. Early Ordovician–Devonian Passive Margin Stage in the Gondwanan Units of the Iberian Massif. In: Quesada, C., Oliveira, J.T. (eds.). The Geology of Iberia: A Geodynamic Approach.
Volume 2: The Variscan Cycle. Springer International Publishing, 75-98.
Hoskin, P.W.O., Schaltegger, U., 2003. The composition of zircon and igneous and metamorphic petrogenesis. Reviews in
Mineralogy and Geochemistry, 53, 27-62.
Kano, K., Matsuura, H., Yamauchi, S., 1997. Miocene rhyolitic welded tuff infilling a funnel-shaped eruption conduit Shiotani, southeast of Matsue, SW Japan. Bulletin of Volcanology, 59, 125-135.
Keppie, J.D., Krogh, T.E., 2000. 440 Ma igneous activity in the Meguma terrane, Nova Scotia, Canada: part of the Appalachian overstep sequence? American Journal of Science, 300, 528-538.
Kullberg, J.C., Rocha, R.B., Soares, A.F., Rey J., Terrinha P., Azerêdo A.C., Callapez P., Duarte, L.V., Kullberg, M.C., Martins, L.,
Miranda, J.R., Alves, C., Mata, J., Madeira, J., Mateus, O., Moreira, M., Nogueira, C.R., 2013. A Bacia Lusitaniana: Estratigrafia, Paleogeografia e Tectónica. In: Dias, R., Araújo, A. Terrinha, P., Kullberg, J.C. (eds.). Geologia de Portugal no contexto da Ibéria. Escolar Editora, 195-347.
Leveridge, B.E., Shail, R.K., 2011. The Gramscatho Basin, south Cornwall, UK: Devonian active margin successions. Proceedings of the Geologists’ Association, 122, 568-615.
Leveridge, B.E., Hartley, A.J., 2006. The Variscan Orogeny: the development of Devonian/Carboniferous basins in SW England and South Wales. In: Brenchley, P.J., Rawson, P.F. (eds.). The Geology of England and Wales. Geological Society of London, 2nd ed., 225-255.
Ludwig, K.R., 2008. Isoplot/Ex Version 3.70: a Geochronological Toolkit for Microsoft Excel, Berkeley Geochronology Center
Special Publication No. 4.
Ludwig, K.R., Mundil, R., 2002, Extracting reliable U-Pb ages and errors from complex populations of zircons from Phanerozoic tuffs. Geochimica et Cosmochimica Acta, v. 66, 463.
Martínez Catalán, J.R., Gómez Barreiro, J., Dias da Silva, Í., Chichorro, M., López-Carmona, A., Castiñeiras, P., Abati, J., Andonaegui, P., Fernández-Suárez, J., González Cuadra, P., Benítez-Pérez, J.M., 2019. Variscan Suture Zone and Suspect Terranes in the NW Iberian Massif: Allochthonous Complexes of the Galicia-Trás os Montes Zone (NW Iberia). In: Quesada, C., Oliveira, J.T. (eds.). The Geology of Iberia: A Geodynamic Approach. Volume 2: The Variscan Cycle. Springer International Publishing, 99-130.
Martínez-Catalán, J.R., Arenas, R., Diaz Garcia, F., GomezBarreiro, J., Abati, J., Castiñeras, P., Fernández-Suárez, J., Sánchez Martínez, S., Adanaegui, P., 2007. Space and Time in the Tectonic Evolution of the Northwestern Iberian Massif. Implications for the Comprehension of the Variscan Belt. In: Hatcher Jr., R.D., Carlson, M.P., McBride, J.H., MartınezCatalan, J.R. (eds.). 4-D Framework of Continental Crust. Boulder (Colorado), Geological Society of America Memoir 200, 403-423.
Matte, P., 2001. The Variscan collage and orogeny (480-290 Ma) and the tectonic definition of the Armorica microplate: a review. Terra Nova, 13, 122-128.
Miranda, R., Valadares, V., Terrinha, P., Mata, J., Azevêdo, M.R., Gaspar, M., Kullberg, J.C., Ribeiro, C., 2009. Age constrains on the Late Cretaceous alkaline magmatism on the West Iberian Margin. Cretaceous Research, 30, 575-586.
Montero, M.P., Bea, F., Corretge, L.G., Floor, P., Whitehouse, M.J., 2008. U-Pb ion microprobedating and Sr-Nd isotope geology of the Galiñeiro Igneous Complex. A model for the peraluminous/peralkaline duality of the Cambro-Ordovician magmatism of Iberia. Lithos, 107, 227-238.
Montero, P., Bea, F., González-Lodeiro, F., Talavera, C., Whitehouse, M.J., 2007. Zircon ages of the metavolcanic rocks and
metagranites of the Ollo de Sapo Domain in central Spain: Implications for the Neoproterozoic to Early Palaeozoic evolution of Iberia. Geological Magazine, 144, 963-976.
Moran, P.C., Barr, S.M., White, C.E., Hamilton, M.A., 2007. Petrology, age, and tectonic setting of the Seal Island Pluton, offshore southwestern Nova Scotia. Canadian Journal of Earth Sciences, 44, 1467-1478.
Motoki, A., Geraldes, M.C., Iwanuch, W., Vargas, T., Motoki, K.F., Balmant, A., Ramos, M.N., 2012. The pyroclastic dyke and
welded crystal tuff of the Morro dos Gatos alkaline intrusive complex, State of Rio de Janeiro, Brazil. Revista da Escola de
Minas, Ouro Preto, Geociências, 65(1), 35-45.
Murphy, J.B., Shellnutt, J.G., Collins, W.J., 2018. Late Neoproterozoic to Carboniferous genesis of A-type magmas in Avalonia of northern Nova Scotia: repeated partial melting of anhydrous lower crust in contrasting tectonic environments. International Journal of Earth Sciences, 107, 587-599.
Nance, R.D., Neace, E.R., Braid, J.A., Murphy, B., Dupuis, N., Shail, R.K., 2015. Does the Meguma Terrane extend into SW England? Journal of the Geological Association of Canada, 42, 61-76.
Oliveira, J.T., 1990. Stratigraphy and Synsedimentary Tectonism in the South Portuguese Zone. In: Dallmeyer, R.D., Martínez, E. (eds.). Pre-Mesozoic Geology of Iberia. Berlin (Heidelberg), Springer Verlag, 334-347.
Oliveira, J.T., Quesada, C., 1986. A comparison of stratigraphy, structure and palaeogeography of the South Portuguese Zone and south-west England, European Variscides. Geoscience in south-west England, 9, 141-150.
Oliveira, J.T., Pereira, E., Ramalho, M., Antunes, M.T., Monteiro, J.H., 1992. Carta Geológica de Portugal, escala 1/500 000. Lisboa, Serviços Geológicos de Portugal.
Oliveira, J.T., Rosa, C.J.P., Pereira, Z., Rosa, D.R.N., Matos, J.X., Inverno, C.M.C., Andersen, T., 2013. Geology of the RosárioNeves Corvo antiform, Iberian Pyrite Belt, Portugal: new insights from physical volcanology, palynostratigraphy and
isotope geochronology studies. Mineralium Deposita, 48, 749-766.
Palain, C., 1976. Une série détritique terrígene, les “Grés de Silves”: Trias et Lias inférieur du Portugal. Memórias dos Serviços Geológicos de Portugal, Lisboa, Nova Serie, 25, 377pp.
Paslawski, L.E., Braid, J.A., Quesada, C., McFarlane, C.M., 2020. Geochronology of the Iberian Pyrite Belt and the Sierra Norte Batholith: Lower Plate Magmatism during Supercontinent Amalgamation? In: Murphy, J.B., Strachan, R.A., Quesada,
C. (eds.). Pannotia to Pangaea: Neoproterozoic and Paleozoic Orogenic Cycles in the Circum-Atlantic Region. London, Geological Society, 503 (Special Publications). DOI: https://doi.org/10.1144/SP503-2020-5
Pe-Piper, G., Reynolds, P.H., Nearing, J., Piper, D.J.W., 2004. Evolution of a Late Paleozoic shear zone in the Cobequid Highlands, Nova Scotia: an 40Ar/39Ar geochronology study. Canadian Journal of Earth Sciences, 41, 1425-1436.
Pereira, M.F., Silva, J.B., Drost, K., Chichorro, M., Apraiz, A., 2010. Relative timing of transcurrent displacements in northern
Gondwana: New U-Pb laser ablation MS-ICP-MS zircon and monazite geochronology of gneisses and sheared granites from the Western Iberian Massif (Portugal). Gondwana Research, 17(2-4), 461-481.
Pereira, M.F., Linnemann, U., Hofmann, M., Chichorro, M., Solá, A.R., Medina, J., Silva, J.B., 2012. The provenance of Late Ediacaran and Early Ordovician siliciclastic rocks in the Southwest Central Iberian zone: Constraints from detrital zircon data on northern Gondwana margin evolution during the late Neoproterozoic. Precambrian Research, 192-195, 166-189.
Pereira, M.F., Chichorro, M., Moita, P., Santos, J.F., Solá, A.M.R., Williams, I.S., Silva, J.B., Armstrong, R.A., 2015. The multistage crystallization of zircon in calc-alkaline granitoids: U-Pb age constraints on the timing of Variscan tectonic activity in SW Iberia. International Journal of Earth Sciences, 104, 1167-1183.
Pereira, M.F., Gama, C., Chichorro, M., Silva, J.B., GutiérrezAlonso, G., Hofmann, M., Linnemann, U., Gärtner, A., 2016. Evidence for multicycle sedimentation and provenance constraints from detrital zircon U-Pb ages: Triassic strata of the Lusitanian basin (western Iberia). Tectonophysics, 681, 318-331.
Pereira, M.F., Gama, C., Rodríguez, C., 2017a. Coeval interaction between magmas of contrasting composition (Late Carboniferous-Early Permian Santa Eulália—Monforte massif, Ossa-Morena zone): Field relationships and geochronological constraints. Geologica Acta, 15(4), 409-428.
Pereira, M.F., Gutierrez-Alonso, G., Murphy, J.B., Drost, K., Gama, C., Silva, J.B., 2017b. Birth and demise of the Rheic Ocean magmatic arc(s): Combined U-Pb and Hf isotope analyses in detrital zircon from SW Iberia siliciclastic strata. Lithos, 278-281, 383-399.
Pereira, M.F., Gama, C., Dias da Silva, Ì., Fuenlabrada, J.M., Silva, J.B., Medina, J., 2020. Isotope geochemistry evidence for Laurussian-type sources of South Portuguese Zone Carboniferous turbidites (Variscan Orogeny). In: Murphy, J.B., Strachan, R.A., Quesada, C. (eds.). Pannotia to Pangaea: Neoproterozoic and Paleozoic.Orogenic Cycles in the CircumAtlantic Region. London, Geological Society, 503 (Special Publications). DOI: https://doi.org/10.1144/SP503-2019-163
Pimentel, N., Pena dos Reis, R., 2016. Petroleum systems of the West Iberian margin: a review of the Lusitanian basin and the deep offshore Peniche basin. Journal of Petroleum Geology, 39(3), 305-326.
Priem, H.N.A., Boelrijk, N.A.I.M., Verschure, R.H., Hebeda, E.H., 1965. Isotopic ages of two granites on the Iberian continetal
margin: the Traba granite (Spain) and the Berlenga granite (Portugal). Geologie en Mijnbouw, 44, 353-354.
Puelles, P., Gil Ibarguchi, J.I., García de Madinabeitia, S., Sarrionandia, F., Carracedo-Sánchez, M., Fernández-Armas, S., 2019. Granulite-facies gneisses and meta-igneous xenoliths from the Campo de Calatrava volcanic field (Spain): Implications for the tectonics of the Variscan lower crust. Lithos, 342-343, 114-134.
Quesada, C., Robardet, M., Gabaldon, V., 1990. Ossa-Morena Zone. Stratigraphy. Synorogenic Phase (Upper Devonian–
Carboniferous–Lower Permian). In: Dallmeyer.R.D., Martínez García, E. (eds.). Pre-Mesozoic Geology of Iberia. BerlinHeidelberg, Springer-Verlag, 273-279.
Ribeiro, A., Munhá, J., Dias, R., Mateus, A., Pereira, E., Ribeiro, L., Fonseca, P., Araújo, A., Oliveira, T., Romão, J., Chaminé, H., Coke, C., Pedro, J., 2007. Geodynamic evolution of the SW Europe variscides. Tectonics, 26, doi:10.1029/2006/TC002058.
Ribeiro, M.L., Reche, J., López-Carmona, A., Aguilar, C., Bento dos Santos, T., Chichorro, M., Dias da Silva, Í., Díez-Montes, A., González-Clavijo, E., Gutiérrez-Alonso, G., Leal, N., Liesa, M., Martínez, F.J., Mateus, A., Mendes, M.H., Moita, P., Pedro, J., Quesada, C., Santos, J.F., Solá, A.R., Valverde-Vaquero, P., 2019. Variscan Metamorphism. In: Quesada, C., Oliveira, J.T. (eds.). The Geology of Iberia: A Geodynamic Approach, Volume 2: The Variscan Cycle. Springer International Publishing, 431-495.
Robardet, M., 2003. The Armorica ‘microplate’: fact or fiction? Critical review of the concept and contradictory palaeobiogeographical data. Palaeogeography, Palaeoclimatology, Palaeoecology, 195(1), 125-148.
Robardet, M., Gutiérrez-Marco, J.C., 2004. The Ordovician, Silurian and Devonian sedimentary rocks of the Ossa-Morena
Zone (SW Iberian Peninsula, Spain). Journal of Iberian Geology, 30, 73-92.
Rocha, R.B., Matiolli, E., Duarte, L.V., Pittet, B., Elmi, S., Mouterde, R., Cabral, M.C., Comas-Rengifo, M.J., Gómez, J.J., Goy, A., Hesselbo, S.P., Jenkyns, H.C., Littler, K., Mailliot, S., Veiga de Oliveira, L.C., Osete, M.L., Perilli, N., Pinto, S., Ruget, Ch., Suan, G., 2016. Base of the Toarcian Stage of the Lower Jurassic defined by the Global Boundary Stratotype Section and Point (GSSP) at the Peniche section (Portugal). Episodes, 39(3), 460-481.
Romariz, C., 1963-1964. Notas petrográficas sobre rochas sedimentares portuguesas- a brecha vulcânica da Papôa (Peniche). Boletim do Museu e Laboratório Mineralógico e Geológico da Faculdade de Ciências de Lisboa, 10(1), 19-28.
Rosa, D.R.N., Finch, A.A., Andersen, T., Inverno, C.M.C., 2008. U-Pb geochronology and Hf isotope ratios of magmatic zircon from the Iberian Pyrite Belt. Mineralogy and Petrology, 95, 47-69.
Rosa, A.R., Cachapuz, P., Bento dos Santos, T., Solá, A.R., Romão, J., Valverde- Vaquero, P., Carvalho, D.R., 2019. Correlação petrográfica e geoquímica entre a Brecha Vulcânica da Papôa (Peniche, W Portugal) e o Arquipélago das Berlengas. Extended abstracts, XII Congreso Ibérico de Geoquímica, Portugal, Universidade de Évora, 70-74.
Rubio-Ordóñez, A., Valverde-Vaquero, P., Corretgé, L.G., CuestaFernández, A., Gallastegui, G., Fernández-González, M., Gerdes, A., 2012. An early Ordovician tonalitic–granodioritic belt along the Schistose-Greywacke Domain of the Central Iberian zone (Iberian Massif, Variscan belt). Geological Magazine, 149(5), 927-939.
Sánchez-García, T., Chichorro, M., Solá, A.R., Álvaro, J.J., DíezMontes, A., Bellido, F., Ribeiro, M.L., Quesada, C., Lopes, J.C., Dias da Silva, Í., González-Clavijo, E., Gómez Barreiro, J., López-Carmona, A., 2019. The Cambrian-Early Ordovician Rift Stage in the Gondwanan Units of the Iberian Massif In: Quesada, C., Oliveira, J.T. (eds.). The Geology of Iberia: A Geodynamic Approach. Volume 2: The Variscan Cycle. Springer International Publishing, 27-74.
Shail, R.K., Leveridge, B.E., 2009. The Rhenohercynian passive margin of SW England: development, inversion and extensional reactivation. Comptes Rendus Geoscience, 341, 140-155.
Shellnutt, J.G., Owen, J.V., Yeh, M.-W., Dostal, J., Nguyen, D.T., 2018. Long-lived association between Avalonia and the Meguma terrane deduced from zircon geochronology of metasedimentary granulites. Scientific Reports, 9, 4065.
Simons, B., Shail, R.K., Andersen, C.O., 2016. The petrogenesis of the Early Permian Variscan granites of the Cornubian Batholith: Lower plate post-collisional peraluminous magmatism in the Rhenohercynian Zone of SW England. Lithos, 260, 76-94.
Stampfli, G.M., Hochard, C., Vérard, C., Wilhem, C., von Raumer, J., 2013. The formation of Pangea. Tectonophysics, 593, 1-19.
Steiger, R.H., Jager, E., 1977. Subcommission on geochronology; convention on the use of decay constants in geo- and cosmochronology. Earth Planetary Science Letters, 36, 359-362.
Talavera, C., Martinez Poyatos, D., González Lodeiro, F., 2015. SHRIMP U–Pb geochronological constraints on the timing of
the intra-Alcudian (Cadomian) angular unconformity in the Central Iberian zone (Iberian Massif, Spain). International Journal of Earth Sciences, 104, 1739-1757.
Tate, M.C., Clarke, D.B., 1995. Petrogenesis and regional tectonic significance of Late Devonian mafic intrusions in the Meguma Zone, Nova Scotia. Canadian Journal of Earth Sciences, 32, 1883-1898.
Terrinha, P., Kullberg, J.C., Neres, M., Alves, T., Ramos, A., Ribeiro, C., Mata, J., Pinheiro, L., Afilhado, A., Matias, L., Luís, J., Muñoz, J.A., Fernández, Ó., 2019. Rifting of the Southwest and West Iberia, 6- Continental Margins. In: Quesada, C., Oliveira, J.T. (eds.). The Geology of Iberia: A Geodynamic Approach. Volume 3: The Alpine Cycle. Springer International Publishing, 251-283.
Valverde-Vaquero, P., Bento dos Santos, T., González Clavijo, E., Díez Montes, A., Ribeiro, M.L., Solá, R., Dias da Silva, Í., 2011. The Berlengas Archipelago granitoids within the frame of the Variscan Orogeny, W Portugal: new data and insights. In: Molina, J.F., Scarrow, J.H., Bea, F., Montero, P. (eds.). VII Hutton Symposium on Granites and Related Rocks, Ávila, 153.
White, C.E., Barr, S.M., 2012. Meguma Terrane revisited: stratigraphy, metamorphism, paleontology and provenance. Geoscience Canada, 39, 8-12.
White, C.E., Barr, S.M., Linnemann, U., 2018. U-Pb (zircon) ages and provenance of the White Rock Formation of the Rockville Notch Group Meguma terrane, Nova Scotia, Canada: evidence for the “Sardian gap” and West African origin. Canadian Journal of Earth Sciences, 55, 589-603.
Williams, I.S., 1998. U-Th-Pb Geochronology by Ion Microprobe. In: McKibben, M.A., Shanks III, W.C., Ridley, W.I. (eds.). Applications of microanalytical techniques to understanding mineralizing processes. Reviews in Economic Geology, 7, 1-35.
Williams, I.S., Hergt, J.M., 2000. U-Pb dating of Tasmanian dolerites: a cautionary tale of SHRIMP analysis of high-U zircon. In: Woodhead, J.D., Hergt, J.M., Noble, W.P. (eds.)., Beyond 2000: New Frontiers in Isotope Geoscience. Lorne, 2000; Abstracts and Proceedings, 185-188.
Winter, C., Breitkreu, Ch., Lapp, M., 2008. Textural analysis of a Late Palaeozoic coherent-pyroclastic rhyolitic dyke system near Burkersdorf (Erzgebirge, Saxony, Germany). In: Thomson, K., Petford, N. (eds.). Structure and Emplacement of High-Level Magmatic Systems. London, Geological Society, 302 (Special Publications), 199-221.
Zbyszewski, G., 1959. Etude Structurale de l’Aire Typhonique de Caldas da Rainha. Lisboa, Memórias dos Serviços Geológicos de Portugal, 3, 184pp.
Downloads
Published
Issue
Section
License
Copyright (c) 2020 Geologica Acta
This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.
Copyright
Geologica Acta is the property of the UB, GEO3BCN, IDAEA and UAB. Geologica Acta must be cited for any partial or full reproduction. Papers are distributed under the Attribution-Share Alike Creative Commons License. This license allows anyone to reproduce and disseminate the content of the journal and even make derivative works crediting authorship and provenance and distributing possible derivative works under the same or an equivalent license.
Author Rights
Authors retain the copyright on their papers and are authorized to post them on their own web pages or institutional repositories. The copyright was retained by the journal from the year 2003 until 2009. In all cases, the complete citation and a link to the Digital Object Identifier (DOI) of the article must be included.
The authors can use excerpts or reproduce illustrations of their papers in other works without prior permission from Geologica Acta provided the source of the paper including the complete citation is fully acknowledged.