Инд. авторы:	Dobretsov N.L., Lazareva E.V., Zhmodik S.M., Ponomarchuk V.A., Travin A.V., Myagkaya I.N., Tolstov A.V., Karmanov N.S.
Заглавие:	Ultrapotassic Rock from the Tomtor Complex of Ultrabasic Alkaline Rocks and Carbonatites (Arctic Siberia)
Библ. ссылка:	Dobretsov N.L., Lazareva E.V., Zhmodik S.M., Ponomarchuk V.A., Travin A.V., Myagkaya I.N., Tolstov A.V., Karmanov N.S. Ultrapotassic Rock from the Tomtor Complex of Ultrabasic Alkaline Rocks and Carbonatites (Arctic Siberia) // Doklady Earth Sciences. - 2020. - Vol.495. - Iss. 2. - P.884-887. - ISSN 1028-334X. - EISSN 1531-8354.
Внешние системы:	DOI: 10.1134/S1028334X20120053; WoS: 000613423400004;
Реферат:	eng: Among the rich REE-Nb ores of the upper ore horizon of the Tomtor deposit, under the Jurassic deposits (borehole 324, interval 47-62 m), ultrapotassic rocks (feldspar porphyrite), consisting of more than 90% potassium feldspar (K-feldspar), are found. The rocks contain titanium-niobium oxide and rare grains of fersmite, Ce-bastnaesite, Ce-monazite, calcite, barite, and strontianite. K-feldspar is unevenly replaced by muscovite. By the type of REE and element distribution on the multidiagrams, the rock correlates well with the rich REE-Nb ores from the Burannyi site at the lower levels of contents. The Ar-Ar age of K-feldspar corresponds to 323.4 Ma and is correlated with the geological time of the formation of the rich REE-Nb ores from the Tomtor deposit, as well as the time of occurrence of magmatic and hydrothermal activity in this part of the region during this period.
Ключевые слова:	rare earth element and niobium deposit; ultra-alkaline rocks; carbonatites; Tomtor;
Издано:	2020
Физ. характеристика:	с.884-887