Publication
Geochemistry of garnets from a tonalite and granitic aplite-pegmatite veins from Ciborro-Aldeia da Serra, Ossa-Morena Zone, Southern Portugal
| dc.contributor.author | Lima, S. S. M. | |
| dc.contributor.author | Neiva, A.M.R. | |
| dc.contributor.author | Ramos, João Farinha | |
| dc.date.accessioned | 2010-06-29T16:34:01Z | |
| dc.date.available | 2010-06-29T16:34:01Z | |
| dc.date.issued | 2009 | |
| dc.description.abstract | Electron-microprobe analysis of garnet from a tonalite and aplite-pegmatite and pegmatite veins cutting different lithologies from an area located in the Ossa-Morena Zone, southern Portugal, show distinct compositions, mainly andradite with a subordinate grossular component in tonalite, and predominantly spessartine with a subordinate almandine component [and rarely, of mainly almandine with a subordinate spessartine component] in the veins. In general, single crystals of garnet are unzoned in tonalite, but commonly show a Mn-enriched core in veins, as the ratio Mn/(Mn + Fe) in the melt is controlled by garnet. However, reverse zoning also occurs owing to resorption of garnet at lower temperatures. A fractionation trend involving a decrease of Mn/(Mn + Fe) occurs in garnet from a complex aplite-pegmatite vein with 22 alternating layers cutting schists; values decrease toward the hanging wall because garnet is the sole host of Mn, which is depleted in the granitic magma. | pt |
| dc.identifier.citation | Lima, S. S. M.; Neiva, Ana Margarida R.; Ramos, João Farinha - Geochemistry of garnets from a tonalite and granitic aplite-pegmatite veins from Ciborro-Aldeia da Serra, Ossa-Morena Zone, Southern Portugal. In: Estudos Geológicos, v. 19 (2), 2009, p. 193-197 | pt |
| dc.identifier.uri | http://hdl.handle.net/10400.9/754 | |
| dc.language.iso | eng | pt |
| dc.subject | Geoquímica | pt |
| dc.subject | Garnet | pt |
| dc.subject | Tonalite | pt |
| dc.subject | Aplitos | pt |
| dc.subject | Pegmatito granítico | pt |
| dc.subject | Ciborro-Aldeia da Serra (Concelho de Montemor-o-Novo, Portugal) | pt |
| dc.subject | Zona de Ossa-Morena (Portugal) | pt |
| dc.title | Geochemistry of garnets from a tonalite and granitic aplite-pegmatite veins from Ciborro-Aldeia da Serra, Ossa-Morena Zone, Southern Portugal | pt |
| dc.type | journal article | |
| dspace.entity.type | Publication | |
| oaire.citation.title | Estudos Geológicos, v. 19 (2), 2009, p. 193-197 | pt |
| person.familyName | Neiva | |
| person.givenName | Ana | |
| person.identifier.orcid | 0000-0001-7808-9461 | |
| person.identifier.scopus-author-id | 7004100726 | |
| rcaap.rights | openAccess | pt |
| rcaap.type | article | pt |
| relation.isAuthorOfPublication | 628605c0-469a-4339-bd21-8c2ea2f72677 | |
| relation.isAuthorOfPublication.latestForDiscovery | 628605c0-469a-4339-bd21-8c2ea2f72677 |