Browsing by Author "Costa, Isabel Ribeiro da"
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- Aspectos petrográficos do metamorfismo de contacto associado ao plutão granítico de Penamacor-MonsantoPublication . Costa, Isabel Ribeiro da; Antunes, I. M.; Ramos, João Farinha; Recio, C.; Barriga, Fernando; Guimarães, Fernanda; Ferreira, NarcisoOs granitos marginais e a auréola de contacto do plutão de Penamacor-Monsanto (Zona Centro-Ibérica da Cadeia Varisca) apresentam heterogeneidades texturais e mineralógicas relevantes para a interpretação dos efeitos desta intrusão granítica nos metassedimentos do Complexo Xisto-Grauváquico encaixante, afectados por metamorfismo regional varisco. Variações térmicas e composicionais durante a instalação dos granitos marginais, bem como a gradação litológica das formações encaixantes, são as causas prováveis das variações texturais e mineralógicas encontradas nas rochas desta auréola metamórfica, que compreende corneanas e xistos mosqueados, estes últimos mostrando-se particularmente afectados por meteorização intensa. A mineralogia destas rochas aponta para metamorfismo de grau baixo a médio, e as frequentes gradações texturais que apresentam traduzem as heterogeneidades dos metassedimentos encaixantes. Fluidos magmáticos tardios enriquecidos em B são provavelmente responsáveis, não só pela turmalina acessória na maioria dos granitos marginais, mas também pela ocorrência de rochas turmaliníticas em várias localidades junto à intrusão de Penamacor-Monsanto.
- Compositional trends in tourmalines from granites and quartz-tourmaline rocks from the Penamacor-Monsanto pluton (Eastern Central Portugal)Publication . Costa, Isabel Ribeiro da; Antunes, I. Margarida H. Ribeiro; Guimarães, Fernanda; Ramos, João Farinha; Recio, C.; Barriga, Fernando; Mourão, C.
- Tourmaline occurrences within the Penamacor-Monsanto granitic pluton and host-rocks (Central Portugal) : genetic implications of crystal-chemical and isotopic featuresPublication . Costa, Isabel Ribeiro da; Mourão, C.; Récio, C.; Guimarães, Fernanda; Antunes, I. M.; Ramos, João Farinha; Barriga, Fernando; Palmer, Martin R.; Milton, J. A.Tourmalinization associated with peraluminous granitic intrusions in metapelitic host-rocks has been widely recorded in the Iberian Peninsula, given the importance of tourmaline as a tracer of granite magma evolution and potential indicator of Sn-W mineralizations. In the Penamacor-Monsanto granite pluton (Central Eastern Portugal, Central Iberian Zone), tourmaline occurs: (1) as accessory phase in two-mica granitic rocks, muscovite-granites and aplites, (2) in quartz (±mica)-tourmaline rocks (tourmalinites) in several exocontact locations, and (3) as a rare detrital phase in contact zone hornfels and metapelitic host-rocks. Electron microprobe and stable isotope (d18O, dD, d11B) data provide clear distinctions between tourmaline populations from these different settings: (a) schorl–oxyschorl tourmalines from granitic rocks have variable foititic component (X? = 17–57 %) and Mg/(Mg + Fe) ratios (0.19–0.50 in two-mica granitic rocks, and 0.05–0.19 in the more differentiated muscovite-granite and aplites); granitic tourmalines have constant d18O values (12.1 ± 0.1 ‰), with wider-ranging dD (-78.2 ± 4.7 ‰) and d11B (-10.7 to -9.0 ‰) values; (b) vein/breccia oxyschorl [Mg/(Mg + Fe) = 0.31–0.44] results from late, B- and Fe-enriched magma-derived fluids and is characterized by d18O = 12.4 ‰, dD = -29.5 ‰, and d11B = -9.3 ‰, while replacement tourmalines have more dravitic compositions [Mg/(Mg + Fe) = 0.26–0.64], close to that of detrital tourmaline in the surrounding metapelitic rocks, and yield relatively constant d18O values (13.1–13.3 ‰), though wider-ranging dD (-58.5 to -36.5 ‰) and d11B (-10.2 to -8.8 ‰) values; and (c) detrital tourmaline in contact rocks and regional host metasediments is mainly dravite [Mg/(Mg + Fe) = 0.35–0.78] and oxydravite [Mg/(Mg + Fe) = 0.51–0.58], respectively. Boron contents of the granitic rocks are low (<650 ppm) compared to the minimum B contents normally required for tourmaline saturation in granitic melts, implying loss of B and other volatiles to the surrounding host-rocks during the late-magmatic stages. This process was responsible for tourmalinization at the exocontact of the Penamacor-Monsanto pluton, either as direct tourmaline precipitation in cavities and fractures crossing the pluton margin (vein/breccia tourmalinites), or as replacement of mafic minerals (chlorite or biotite) in the host-rocks (replacement tourmalinites) along the exocontact of the granite. Thermometry based on 18O equilibrium fractionation between tourmaline and fluid indicates that a late, B-enriched magmatic aqueous fluid (av. d18O ~12.1 ‰, at ~600 °C) precipitated the vein/breccia tourmaline (d18O ~12.4 ‰) at ~500–550 °C, and later interacted with the cooler surrounding host-rocks to produce tourmaline at lower temperatures (400–450 °C), and an average d18O ~13.2 ‰, closer to the values for the host-rock. Although B-metasomatism associated with some granitic plutons in the Iberian Peninsula seems to be relatively confined in space, extending integrated studies such as this to a larger number of granitic plutons may afford us a better understanding of Variscan magmatism and related mineralizations.
- Transition metals responsible for striking colour variation in tourmalines : an EMP study of tourmalines from granites and quartz-tourmaline rocks associated to the Penamacor-Monsanto pluton (Eastern Central Portugal)Publication . Costa, Isabel Ribeiro da; Antunes, I. Margarida H. Ribeiro; Guimarães, Fernanda; Rodrigues, P. C. R.; Barriga, Fernando; Mourão, C.; Ramos, João Farinha; Hernandez, Récio