Back to Alkaline RocksNext photoThe Lovozero Mts (a.k.a. Lovozero tundra or Lujavrurt) in Arctic Russia is the third largest intrusion of nepheline syenites and related rocks in the world. Both Lovozero and Khibiny are situated in the Kola Alkaline Province. The most striking features of the Lovozero intrusion are its layered structure (see the following slides) and remarkable enrichment in "incompatible" elements. For example, almost the entire Lovozero complex (including Mt. Alluaiv, where this photo was taken from) is capped by a massive (a few hundred meters in thickness) layer of lujavrite containing the Na-Ca-Zr silicate eudialyte as one of its major constituents! Just to put things in perspective for you: at most other localities of alkaline rocks, eudialyte is present in visible quantities only in the most geochemically evolved mineral parageneses, like agpaitic pegmatites. Other minerals that are extremely rare at other localities, but very common here are lamprophyllite, loparite and murmanite. The mineralogy of Lovozero pegmatites and the saga of mineral exploration and mining in this corner of the Russian Arctic are described in Igor Pekov's book Lovozero (2002, Ocean Pictures).
Lovozero Mts, Kola (Russia)