On the origin of urtites of the Khibiny alkaline massif
Abstract
The urtites in the Khibiny massif are part of a complex ijolite-urtite complex of rocks occurring among nepheline syenites in the form of a horseshoe-shaped body hollowly falling to the center of the massif. Within this body, trachytoid ijolites are the most widespread. The so-called fine-grained iiolites are very insignificantly distributed here. According to the data of geological mapping of the ijoliturtite band, urtites lie among trachytoid ijolites and are exposed on the day surface in the hanging side or central part of the horseshoe-shaped body.
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References
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