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dc.contributor.authorAndersen, Tom
dc.contributor.authorSørensen, Henning
dc.coverage.spatial17131 Siljan
dc.description.abstractA small body of trachyte or microsyenite cropping out east of lake Mykle in the Vestfold Graben of the Oslo Rift probably represents a subvolcanic intrusion emplaced at a fairly early stage of the intrusive history of the Siljan-Mykle area. The microsyenite shows chemical, petrographical and mineralogical features intermediate between larvikite and nordmarkite, suggesting that it represents a transitional magma type. The microsyenite shows pyroxene zonation patterns indicating a discontinous, two-stage crystallization history, whose initial stage resembles that observed in normal larvikite. At the final stage of pyroxene growth, the melt had developed to a more alkaline composition, resembling some of the less alkaline (alkali) syenites in the rift.
dc.relation.ispartofseriesNGU Bulletin (441)
dc.rightsNavngivelse 4.0 Internasjonal
dc.titleMicrosyenite from Lake Mykle, Oslo Rift: Subvolcanic rocks transitional between larvikite and nordmarkite
dc.typeJournal article

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    Artikler fra seriene NGU, NGU Bulletin og NGU Skrifter

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