Layered Nb-REE ores in the Tomtor Complex (Arctic Siberia): Formation conditions

Elena Lazareva, Sergey Zhmodik, Nikolay Dobretsov, Alexander Tolstov, Nikolay Karmanov, Andrey Dar'In, Ivan Kirichenko

Результат исследования: Научные публикации в периодических изданияхстатья по материалам конференции

Аннотация

We study a unique deposit of Nb-REE ores that occur as three orebodies overlying weathered rocks of the Tomtor ultramafic alkaline-carbonatite complex in the northern Sakha Republic (Yakutia). The formation conditions of the rich Tomtor ores remain poorly constrained. Our hypothesis is that these ores, composed of detrital and authigenic minerals, were deposited in a hydrothermal lake. The Eh-pH parameters of water are reconstructed from REE distribution in ores and in monazite, with reference to results of thermodynamic calculations. The stability fields of hydrous Ce, La, and Nd phosphates in the Pourbaix diagrams are proximal in a region within a small range of pH (4-6) and Eh (-0.25 -+0.25 V). Monazite apparently formed by dehydration of the precursor phase of hydrous REE phosphate. This inference is supported by coexistence of Fe3+ and Fe2+ minerals.

Язык оригиналаанглийский
Номер статьи05011
Число страниц5
ЖурналE3S Web of Conferences
Том98
DOI
СостояниеОпубликовано - 7 июн 2019
Опубликовано для внешнего пользованияДа
Событие16th International Symposium on Water-Rock Interaction, WRI 2019 and 13th International Symposium on Applied Isotope Geochemistry, 1st IAGC International Conference - Tomsk, Российская Федерация
Продолжительность: 21 июл 201926 июл 2019

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