Melketinden, Kvaløya ultrapotassic dike, Kvaløya, Tromsø, Troms og Finnmark, Norwayi

Regional Level Types
Melketinden	Outcrop
Kvaløya ultrapotassic dike	Dike
Kvaløya	Island
Tromsø	Municipality
Troms og Finnmark	County
Norway	Country

A lamproite dike that outcrops in a narrow gorge south of Melketinden. The gorge is filled with talus blocks and only a few exposures of the dyke-rock can be observed (Schingaro et al. 2014)

The dike is of inferred Carboniferous age and is crossing a granite of 1792+/-5 Ma age(Zozulya et al. 2010). It is a Si-rich phlogopite lamproite of a transitional type, and has an unusual Ti-Ba-P accessory mineralization (Zozulya et al. 2010).
The dike is 0.3–0.4 m thick, of a transitional type, and has an unusual Ti-Ba-P accessory mineralization (Zozulya et al. 2010). The rock consists of phenocrysts of light brown Mg-rich fluorotetraferriphlogopite, phlogopite, yangzhumingite and apatite in a fine-grained matrix dominated by K-feldspar, quartz and alkali amphiboles. 3 compositional groups of amphiboles, that include ^CNa-, Fe²⁺-, Fe³⁺- and O-rich "potassic-obertiite" (actually more likely "potassic-ferri-obertiite").

Other Regions, Features and Areas containing this locality

References