The discovery of the Tomtor Massif in the northern part of the Siberian Platform - Comparison with the Khibina Massif on Kola Peninsula and its potential in REE and Nb
Kravchenko, Svet M.
published: Aug 1, 1996
ArtNo. ESP136000601007, Price: 19.00 €
The Tomtor Massif is located to the east of Anabar Shield and is covered by Permian and Jurassic sedimentary rocks. It is a typical ring-complex, belonging to carbonatitic alkalic-ultrabasic association. The Tomtor (up to 350 km2) belongs to the group of 'giant massifs', which include the Khibina and Lovozero massifs on Kola Peninsula. The discovery of very rich Sc-REE-Y-Nb ores in the Tomtor Massif provides opportunity for economic exploitation, inspite of the unfavorable location of the massif. The recent detailed studies, using a large number of drillcore samples, have shown that the Tomtor is one of the world's largest deposits of niobium and the rare earths. The mean content of economic components of the rich ores is as follows (in mass percent): Sc 0.04; Y 0.80; REE 13.80; Nb 5.40. The Rb/Ar ages of rocks and ores are 800-240 Ma. The formation of the rich ores is mainly connected with redeposition of carbonatite weathering crust in an aqueous environment.