GEODOC - Catálogo bibliográfico de Geociências. Pesquisa: "DE Granitos" + "DE Granitos$" Resultados de 1 a 5 sobre 542 encontrados.
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Autor: LIMA, M. I. Alves
Título: Radiación gamma en rocas usadas como material de construcción : el Granito de Braga, No de Portugal = Gamma radiation in rocks used as building materials : the Braga Granite, Nw Portugal / M. I. Alves Lima, J. Sanjurjo-Sánchez
In: Cadernos do Laboratorio Xeolóxico de Laxe. - ISSN 0213-4497. - Vol. 38 (2015), p. 79-92
Notas gerais: Contém 4 tabelas
Assuntos: Granitos / Materiais de construção / Radiação Gama Natural / Radioisótopos / Espectrometria de raios gama / Braga (Portugal) / Portugal (Noroeste)
Cota: E75-P2NBP ES-68
Tipo de documento: Texto impresso
País de publicação: ES|Coruña

Outro(s) autor(es) : Sanjurjo Sánchez, Jorge



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DADOS GEOQUÍMICOS E RADIOMÉTRICOS PRELIMINARES DOS GRANITOS DA REGIÃO DE VILA REAL, NORTE DE PORTUGAL
Título: Dados geoquímicos e radiométricos preliminares dos granitos da região de Vila Real, Norte de Portugal [resumo] / R. J. S. Teixeira... [et al.]
Publicação: Porto : [s.n.], 2014
Descrição física: [1] p.
Notas ed.e hist.bibliográfica: IX Congresso Nacional de Geologia / 2º Congresso de Geologia dos Países de Língua Portuguesa : IX CNG/2º COGEPLIP, Porto, Portugal, 18 a 24 de Julho de 2014, Livro de Resumos, p. 65
Assuntos: Geoquímica / Radiometria / Radiação / Raios Gama / Radão / Granitos / Região de Vila Real (Portugal) / Portugal (Norte)
URL: http://hdl.handle.net/10400.9/2815
Cota: 13-s2031LGM-NBAH 36761
Tipo de documento: Texto impresso
País de publicação: PT|Porto

Outro(s) autor(es) : Teixeira, R. J. S. / Martins, L. M. O. / Gomes, M. Elisa Preto / Pereira, A. J. C. M. / Ferreira, Narciso / Pereira, A. J. C. S. / Neves, L. J. P. F.

Dados geoquímicos e radiométricos preliminares dos granitos da região de Vila Real, Norte de Portugal

Dados geoquímicos e radiométricos preliminares dos granitos da região de Vila Real, Norte de Portugal



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GEOCHEMICAL AND ISOTOPIC CONSTRAINTS ON PETROGENESIS
Título: Geochemical and isotopic constraints on petrogenesis : the Serra da Freita pluton, a typical granite body from the Portuguese Hercynian collision belt / R. J. Reavy... [et al.]
In: Geological Society of America Bulletin. - ISSN 0016-7606. - Vol. 103 (March 1991), p. 392-401
Notas gerais: Contém 8 figuras e 4 tabelas
Assuntos: Geoquímica isotópica / Petrogénese / Granitos / Plutonismo / Orogenia hercínica / Serra da Freita (Portugal)
Cota: E93-P1/4NBP US-54
Tipo de documento: Texto impresso
País de publicação: US|Boulder

Outro(s) autor(es) : Reavy, R. J. / Stephens, W. Edryd / Fallick, A. E. / Halliday, Alex N. / Godinho, Manuel Maria

Geochemical and isotopic constraints on petrogenesis : the Serra da Freita pluton, a typical granite body from the Portuguese Hercynian collision belt

Geochemical and isotopic constraints on petrogenesis : the Serra da Freita pluton, a typical granite body from the Portuguese Hercynian collision belt



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TOURMALINE OCCURRENCES WITHIN THE PENAMACOR-MONSANTO GRANITIC PLUTON AND HOST-ROCKS, CENTRAL PORTUGAL
Título: Tourmaline occurrences within the Penamacor-Monsanto granitic pluton and host-rocks, Central Portugal : genetic implications of crystal-chemical and isotopic features / I. Ribeiro da Costa... [et al.]
Publicação: [S.l.] : Springer, 2014
Descrição física: [23] p. : il., 9 figuras e 3 tabelas ; 30 cm
Sumário ou resumo: 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.
Notas ed.e hist.bibliográfica: Sep. de: Contributions to Mineralogy and Petrology, Vol. 167 (April 2014), p. 993
ISSN: ISSN 0010-7999
Assuntos: Turmalina / Granitos / Pluton / Região de Penamacor (Portugal) / Região de Monsanto (Portugal)
URL: http://dx.doi.org/10.1007/s00410-014-0993-7
URL: http://hdl.handle.net/10400.9/2654
Cota: 13-s2024LGM-NBAH 36459
Tipo de documento: Texto impresso

Outro(s) autor(es) : Costa, Isabel Ribeiro da / Mourão, C. / Récio, C. / Guimarães, Fernanda M. G. / Antunes, Isabel Margarida Horta Ribeiro / Ramos, João Farinha / Barriga, Fernando / Palmer, Martin R. / Milton, J. A.

Tourmaline occurrences within the Penamacor-Monsanto granitic pluton and host-rocks (Central Portugal)...

Tourmaline occurrences within the Penamacor-Monsanto granitic pluton and host-rocks (Central Portugal)...



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RADIOMETRIC CONSTRAINTS ON HYDROTHERMAL CIRCULATION IN COOLING GRANIT PLUTONS
Título: Radiometric constraints on hydrothermal circulation in cooling granit plutons : the Jales gold-quartz mineralisation, Northern Portugal / A. M. R. Neiva... [et al.]
In: Mineralium Deposita. - ISSN 0026-4598. - Vol. 30, n.º 6 (1995), p. 460-468
Notas gerais: Contém 3 figuras e 6 tabelas
Assuntos: Radiometria / Granitos / Pluton / Mineralização / Minas de Jales (concelho de Vila Pouca de Aguiar, Portugal) / Portugal (Norte)
Cota: E12-P4NBP DE-91
Tipo de documento: Texto impresso
País de publicação: DE|Berlin

Outro(s) autor(es) : Neiva, Ana Margarida R. / Dodson, Martin H. / Rex, David C. / Guise, P. G.

Radiometric constraints on hydrothermal circulation in cooling granit plutons...

Radiometric constraints on hydrothermal circulation in cooling granit plutons...



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