| Popis: |
The article shows first results of the large pantelleritic dike swarm study. Dike swarm breaks through the Middle Paleozoic granites and has a length of up to 40 km with the general Northeastern extension. The swarm rocks composition corresponds to pantellerite trachytes (AGP ~ 1.1) and pantellerites (AGP ~ 1.3). Felsic feldspars and amphiboles (arfvedsonite and cataphorite) as the main phenocrysts, in the microlite paragenesis, represent the mineral composition and the presence of such rare minerals as lorenzenite, Ca-ancylite, catapleiite, monazite, enigmatite eudialite and titanium is noted, such a set of minerals corresponds to typical agpaitic rocks. The distribution of rare elements in the Tsagaan-Uul dike swarm rocks both in character and concentration level corresponds to the petrotype. The key difference is the presence of Nb–Ta anomaly in pantellerite trachytes and pantellerites, which may indicate the involvement of fluid in the formation of the swarm rocks. |
