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dc.contributor.authorPratt, Allan Oliver
dc.coverage.spatial18341 Alta
dc.date.accessioned2020-08-26T09:08:05Z
dc.date.available2020-08-26T09:08:05Z
dc.date.issued1989
dc.identifier.urihttps://hdl.handle.net/11250/2674201
dc.description.abstractThe 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.isoeng
dc.relation.ispartofseriesNGU Bulletin (414)
dc.rightsNavngivelse 4.0 Internasjonal
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/deed.no
dc.subjectGABBRO
dc.subjectKALEDONSKE FJELLKJEDE
dc.subjectPETROLOGI
dc.titlePetrology of differential gabbro sheets in the Altenes tectonic window, North Norway.
dc.typeJournal article
dc.description.localcode35176
dc.source.pagenumber21-35


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Navngivelse 4.0 Internasjonal
Except where otherwise noted, this item's license is described as Navngivelse 4.0 Internasjonal