Publication
Geochemistry of granitic aplite-pegmatite veins and sills and their minerals from the Sabugal area, central Portugal
| dc.contributor.author | Neiva, A.M.R. | |
| dc.contributor.author | Silva, Paulo Bravo | |
| dc.contributor.author | Ramos, João Farinha | |
| dc.date.accessioned | 2013-12-08T13:10:21Z | |
| dc.date.available | 2013-12-08T13:10:21Z | |
| dc.date.issued | 2012-02 | |
| dc.description.abstract | Granitic beryl-columbite-phosphate subtype aplite-pegmatite veins and sills from the Sabugal area intruded a biotite > muscovite granite which is related to another two-mica granite. Variation diagrams of major and trace elements of whole rocks show fractionation trends. REE patterns and δ18O of whole rocks, BaO and P2O5 contents of K-feldspar, anorthite and P2O5 contents of plagioclase, major element and Li contents of muscovite and lithian muscovite support this series. Least squares analysis of major elements indicate that the biotite > muscovite granite and aplite-pegmatite veins and sills are derived from the earlier two-mica granite magma by fractional crystallization of quartz, plagioclase, K-feldspar, biotite and ilmenite. Modelling of trace elements shows that magmatic fl uxes and fl uids controlled the Rb, Sr and Ba contents of aplite-pegmatites, probably also lithium micas (zinnwaldite, polylithionite and rare lepidolite), cassiterite, columbite-tantalite, fl uorapatite and triplite. In aplite-pegmatites, lithian muscovite replaces primary muscovite and late lithium micas replace lithian muscovite. Complexely zoned columbite crystals are chemically characterized and attributed to disequilibrium conditions. Relations of granites and aplite-pegmatites and pegmatites from other Portuguese and Spanish areas are compared. The granitic aplite-pegmatites from Sabugal are moderately fractionated and the granitic complex type aplite-pegmatites from Gonçalo are the richest in Li and Sn, derived from a higher degree of fractional crystallization and fl uxes and fl uids control the Ba and Rb behaviours and Li, Sn, F and Ta concentrations. | por |
| dc.identifier.citation | Neiva, Ana M. R.; Silva, Paulo B., Ramos, João M. F. - Geochemistry of granitic aplite-pegmatite veins and sills and their minerals from the Sabugal area, central Portugal. In: Neues Jahrbuch für Mineralogie Abhandlungen, vol. 189. n.1 (Feb. 2012), p. 49-74 | por |
| dc.identifier.uri | http://hdl.handle.net/10400.9/2079 | |
| dc.language.iso | eng | por |
| dc.relation.publisherversion | http://dx.doi.org/10.1127/0077-7757/2011/0209 | por |
| dc.subject | Geoquímica | por |
| dc.subject | Aplitos | por |
| dc.subject | Pegmatito granítico | por |
| dc.subject | Feldspatos | por |
| dc.subject | Micas | por |
| dc.subject | Columbite | por |
| dc.subject | Tantalite | por |
| dc.subject | Fosfatos | por |
| dc.subject | Região do Sabugal (Portugal) | por |
| dc.subject | Portugal (Centro) | por |
| dc.title | Geochemistry of granitic aplite-pegmatite veins and sills and their minerals from the Sabugal area, central Portugal | por |
| dc.type | journal article | |
| dspace.entity.type | Publication | |
| oaire.citation.conferencePlace | Stuttgart, Germany | por |
| oaire.citation.title | Neues Jahrbuch für Mineralogie Abhandlungen | por |
| person.familyName | Neiva | |
| person.givenName | Ana | |
| person.identifier.orcid | 0000-0001-7808-9461 | |
| person.identifier.scopus-author-id | 7004100726 | |
| rcaap.rights | openAccess | por |
| rcaap.type | article | por |
| relation.isAuthorOfPublication | 628605c0-469a-4339-bd21-8c2ea2f72677 | |
| relation.isAuthorOfPublication.latestForDiscovery | 628605c0-469a-4339-bd21-8c2ea2f72677 |