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Estrutura e geoquímica das fases magmática e tardimagmática em zircões do maci...
Mendes, Anabela Carreira; Dias, G.; Pupin, J. P.Efectuou-se um estudo da estrutura interna e composição química dos zircões de granitos do maciço de Peneda-Gerês (granitos de Gerês, Paufito, Illa e Carris) com recurso a microscópio electrónico de varrimento (MEV) e microssonda electrónica. Este estudo permitiu caracterizar as fases magmática e tardimagmática e, ainda, constatar a existência de domínios de alteração nas zonas dos cristais mais ricas em elemen...
Mantle-like Sr-Nd isotope composition of Fe-K subalkaline granites : the Peneda...
Mendes, Anabela Carreira; Dias, G.The Peneda-Gerês massif is one of the most representative NW Iberian late- to post-orogenic Variscan granitic plutons. It resulted essentially from the subsynchronous emplacement, at 290-296 Ma, of two granitic magmas of Fe-K subalkaline affinity, with primitive isotopic composition: Sri = 0.703-0.707 and eNdi = -1.5 to -2.4. An origin by mantle input followed by mantle-crust interactions is proposed, implying ...
Chronology of granitic structures in variscan "folded" granite associated to a ...
Simões, P. P.; Dias, G.; Mendes, Anabela CarreiraPoster apresentado no 32nd International Geological Congress, Florença, Itália, 20-28 Agosto 2004.
Crust and mantle-like SR-ND isotope signatures of variscan granites in Iberia :...
Dias, G.; Simões, P. P.; Mendes, Anabela CarreiraComunicação apresentada no 32nd International Geological Congress, Florença, Itália, 20-28 Agosto 2004.
Composição isotópica Sr-Nd de granitos subalcalinos ferro-potássicos : o maciço...
Mendes, Anabela Carreira; Dias, G.The Peneda-Gerês granitic massif is a good example of a post-tectonic Variscan massif. The granites are dominantly of subalkaline Fe-K affinity. The integration of geological, mineralogical, chemical and isotopic data suggests that this massif is the result of the emplacement of at least three intrusive magmas (Gerês-Covas, Calvos and Paufito-Illa-Carris) that evolved independently. A comparative study with oth...
The geological heritage of the Peneda-Gerês National Park (NW Portugal) and it...
Brilha, J. B.; Dias, G.; Mendes, Anabela Carreira; Henriques, Renato F.; Azevedo, I.; Pereira, RosaThe use of Information and Communication Technologies for the divulgation of the geological heritage must be faced as a priority. Due to their characteristics, the possibility of presenting geological features is greatly enhanced using multimedia materials distributed by Internet or in CD-ROM's. In this work we present the project under development, centered on the production of electronic materials regarding t...
Sr-Nd isotopic constraints on the genesis of hercynian granitoids from the Cent...
Dias, G.; Simões, P. P.; Mendes, Anabela Carreira; Leterrier, J.Poster apresentado no IV Hutton Symposium, Clermont-Ferrand, França, 20-25 Setembro 1999.
U–Pb zircon and monazite geochronology of post-collisional hercynian granitoids...
Dias, G.; Leterrier, J.; Mendes, Anabela Carreira; Simões, P. P.; Bertrand, J. M.In the Central Iberian Zone (CIZ) of the Iberian Massif large volumes of granitoids were emplaced during the post-collisional stage of the Hercynian orogeny (syn- to post-D3, the last ductile deformation phase). Twelve granitic units and a quartz monzodiorite were selected for a U–Pb zircon and monazite geochronological study. They represent successive stages of the D3 event. The Ucanha-Vilar, Lamego, Sameiro a...
Petrology and U-Pb geochronology of a late-hercynian subalkaline granitic massi...
Mendes, Anabela Carreira; Dias, G.; Leterrier, J.; Bertrand, J. M.
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