Publication
Tourmaline occurrences within the Penamacor-Monsanto granitic pluton and host-rocks (Central Portugal) : genetic implications of crystal-chemical and isotopic features
| dc.contributor.author | Costa, Isabel Ribeiro da | |
| dc.contributor.author | Mourão, C. | |
| dc.contributor.author | Récio, C. | |
| dc.contributor.author | Guimarães, Fernanda | |
| dc.contributor.author | Antunes, I. M. | |
| dc.contributor.author | Ramos, João Farinha | |
| dc.contributor.author | Barriga, Fernando | |
| dc.contributor.author | Palmer, Martin R. | |
| dc.contributor.author | Milton, J. A. | |
| dc.date.accessioned | 2015-03-21T22:27:20Z | |
| dc.date.available | 2015-03-21T22:27:20Z | |
| dc.date.issued | 2014-04 | |
| dc.description.abstract | 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. | por |
| dc.identifier.citation | Costa, I. Ribeiro da... [et al.] - Tourmaline occurrences within the Penamacor-Monsanto granitic pluton and host-rocks (Central Portugal) : genetic implications of crystal-chemical and isotopic features. In: Contributions to Mineralogy and Petrology, Vol. 167 (April 2014), p. 993 | por |
| dc.identifier.doi | http://dx.doi.org/10.1007/s00410-014-0993-7 | |
| dc.identifier.issn | 0010-7999 | |
| dc.identifier.uri | http://hdl.handle.net/10400.9/2654 | |
| dc.language.iso | eng | por |
| dc.subject | Turmalina | por |
| dc.subject | Granitos | por |
| dc.subject | Região de Penamacor (Portugal) | por |
| dc.subject | Região de Monsanto (Portugal) | por |
| dc.title | Tourmaline occurrences within the Penamacor-Monsanto granitic pluton and host-rocks (Central Portugal) : genetic implications of crystal-chemical and isotopic features | por |
| dc.type | journal article | |
| dspace.entity.type | Publication | |
| oaire.citation.title | Contributions to Mineralogy and Petrology | por |
| person.familyName | Guimarães | |
| person.givenName | Fernanda | |
| person.identifier.orcid | 0000-0001-6961-9256 | |
| rcaap.rights | openAccess | por |
| rcaap.type | article | por |
| relation.isAuthorOfPublication | c2c84ba4-fe6b-4c34-8a68-ffc0ad4ab352 | |
| relation.isAuthorOfPublication.latestForDiscovery | c2c84ba4-fe6b-4c34-8a68-ffc0ad4ab352 |