Ultrapotassic Rock from the Tomtor Complex of Ultrabasic Alkaline Rocks and Carbonatites (Arctic Siberia)

被引：3

作者：

Dobretsov, N. L. ^{[1
,2
]}

Lazareva, E. V. ^{[1
]}

Zhmodik, S. M. ^{[1
]}

Ponomarchuk, V. A. ^{[1
]}

Travin, A. V. ^{[1
]}

Myagkaya, I. N. ^{[1
]}

Tolstov, A. V. ^{[1
]}

Karmanov, N. S. ^{[1
]}

机构：

[1] Russian Acad Sci, Sobolev Inst Geol & Mineral, Siberian Branch, Novosibirsk 630090, Russia

[2] Russian Acad Sci, Trofimuk Inst Petr Geol & Geophys, Siberian Branch, Novosibirsk 630090, Russia

来源：

DOKLADY EARTH SCIENCES | 2020年 / 495卷 / 02期

基金：

俄罗斯科学基金会;

关键词：

Tomtor; rare earth element and niobium deposit; carbonatites; ultra-alkaline rocks;

D O I：

10.1134/S1028334X20120053

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

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.

引用

页码：884 / 887

页数：4

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