dc.contributor.author | Pratt, Allan Oliver | |
dc.coverage.spatial | 18341 Alta | |
dc.date.accessioned | 2020-08-26T09:08:05Z | |
dc.date.available | 2020-08-26T09:08:05Z | |
dc.date.issued | 1989 | |
dc.identifier.uri | https://hdl.handle.net/11250/2674201 | |
dc.description.abstract | The petrography of two differentiated gabbro sheets in the low-grademetamorphic Karelian supracrustal sequence of the Altenes Tectonic Window isdescribed. The intrusion have generally undergone extensive deuteric alter-ation. Detailed petrographic studies established the primary parageneses andvariation in the gabbro sheets and formed the basis for an interpretation ofthe geochemical profiles. Both intrusion have a distinct mineralogical andchemical variation suggesting that gabbro sheets in the window probablycomprise both sills and slightly inclined intrusions. Magmatic rocks in theAltenes Window describe a definite tholeiitic trend. Zr-FeO\/MgO and Zr-Y plotsof the two studied intrusions suggest the existence of two magmatic suites.The Trollvatn sill is interpreted as syngenetic with the mafic extrusive rockswhile the Sagelv intrusion probably intruded at a low angle in an early stageof the Svecokarelian orogeny. | |
dc.language.iso | eng | |
dc.relation.ispartofseries | NGU Bulletin (414) | |
dc.rights | Navngivelse 4.0 Internasjonal | |
dc.rights.uri | http://creativecommons.org/licenses/by/4.0/deed.no | |
dc.subject | GABBRO | |
dc.subject | KALEDONSKE FJELLKJEDE | |
dc.subject | PETROLOGI | |
dc.title | Petrology of differential gabbro sheets in the Altenes tectonic window, North Norway. | |
dc.type | Journal article | |
dc.description.localcode | 35176 | |
dc.source.pagenumber | 21-35 | |