Albitite deposits

ALBITITE DEPOSITS (EN: albitite deposits; DE: Albititvorkommen; FR: gisements d'albite; ES: yacimientos de albita; RU: альбититовые месторождения) are the stock-shaped and linearly extended masses of the albitized domes and the apophysis of the acidic and alkaline plutonic igneous rocks, and also of the metamorphic rocks, which are containing within their constitution the minerals of the rare metals (columbite-tantalite, pyrochlore, zircon, beryl, lepidolite, bertrandite, uraninite, thorite, and others).

The albitite deposits have formed themselves as the consequence of the substitution of the potassium and calcium containing minerals of the igneous and metamorphic rocks by the albite under the influence of the rising postmagmatic or postmetamorphic alcaline mineralized solutions. There were dissolved and removed from the deep parts of the igneous and metamorphic rocks during this process the admixtures of the rare metals, which have been scattered within these rocks, with the subsequent redeposition and concentration of these admixtures at the places of the albitization.

The albitite deposits occupy the area of up to several square kilometres, and extend to the depth of down to 1 kilometre. There are associated with them the ores of the radioactive elements, niobium, zirconium, lithium, beryllium, rare-earth elements of the yttrium and cerium groups. The main provinces of the distribution of the albitite deposits in the USSR are Ukraine, Kazakhstan, Transbaikalia, Far East, and North East. Thanks to the shallow bedding, the albitite deposits are suitable for the open pit development.