Layered Nb-REE ores in the Tomtor Complex (Arctic Siberia): Formation conditions
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 or...
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ftdoajarticles:oai:doaj.org/article:4fc7faf75b154a68857ae2445786af80 2023-05-15T15:03:24+02:00 Layered Nb-REE ores in the Tomtor Complex (Arctic Siberia): Formation conditions Lazareva Elena Zhmodik Sergey Dobretsov Nikolay Tolstov Alexander Karmanov Nikolay Dar’in Andrey Kirichenko Ivan 2019-01-01T00:00:00Z https://doi.org/10.1051/e3sconf/20199805011 https://doaj.org/article/4fc7faf75b154a68857ae2445786af80 EN FR eng fre EDP Sciences https://www.e3s-conferences.org/articles/e3sconf/pdf/2019/24/e3sconf_wri-162018_05011.pdf https://doaj.org/toc/2267-1242 2267-1242 doi:10.1051/e3sconf/20199805011 https://doaj.org/article/4fc7faf75b154a68857ae2445786af80 E3S Web of Conferences, Vol 98, p 05011 (2019) Environmental sciences GE1-350 article 2019 ftdoajarticles https://doi.org/10.1051/e3sconf/20199805011 2022-12-31T15:55:46Z 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. Article in Journal/Newspaper Arctic Sakha Sakha Republic Yakutia Siberia Directory of Open Access Journals: DOAJ Articles Arctic Sakha E3S Web of Conferences 98 05011 |
institution |
Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
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ftdoajarticles |
language |
English French |
topic |
Environmental sciences GE1-350 |
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Environmental sciences GE1-350 Lazareva Elena Zhmodik Sergey Dobretsov Nikolay Tolstov Alexander Karmanov Nikolay Dar’in Andrey Kirichenko Ivan Layered Nb-REE ores in the Tomtor Complex (Arctic Siberia): Formation conditions |
topic_facet |
Environmental sciences GE1-350 |
description |
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. |
format |
Article in Journal/Newspaper |
author |
Lazareva Elena Zhmodik Sergey Dobretsov Nikolay Tolstov Alexander Karmanov Nikolay Dar’in Andrey Kirichenko Ivan |
author_facet |
Lazareva Elena Zhmodik Sergey Dobretsov Nikolay Tolstov Alexander Karmanov Nikolay Dar’in Andrey Kirichenko Ivan |
author_sort |
Lazareva Elena |
title |
Layered Nb-REE ores in the Tomtor Complex (Arctic Siberia): Formation conditions |
title_short |
Layered Nb-REE ores in the Tomtor Complex (Arctic Siberia): Formation conditions |
title_full |
Layered Nb-REE ores in the Tomtor Complex (Arctic Siberia): Formation conditions |
title_fullStr |
Layered Nb-REE ores in the Tomtor Complex (Arctic Siberia): Formation conditions |
title_full_unstemmed |
Layered Nb-REE ores in the Tomtor Complex (Arctic Siberia): Formation conditions |
title_sort |
layered nb-ree ores in the tomtor complex (arctic siberia): formation conditions |
publisher |
EDP Sciences |
publishDate |
2019 |
url |
https://doi.org/10.1051/e3sconf/20199805011 https://doaj.org/article/4fc7faf75b154a68857ae2445786af80 |
geographic |
Arctic Sakha |
geographic_facet |
Arctic Sakha |
genre |
Arctic Sakha Sakha Republic Yakutia Siberia |
genre_facet |
Arctic Sakha Sakha Republic Yakutia Siberia |
op_source |
E3S Web of Conferences, Vol 98, p 05011 (2019) |
op_relation |
https://www.e3s-conferences.org/articles/e3sconf/pdf/2019/24/e3sconf_wri-162018_05011.pdf https://doaj.org/toc/2267-1242 2267-1242 doi:10.1051/e3sconf/20199805011 https://doaj.org/article/4fc7faf75b154a68857ae2445786af80 |
op_doi |
https://doi.org/10.1051/e3sconf/20199805011 |
container_title |
E3S Web of Conferences |
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98 |
container_start_page |
05011 |
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1766335257062146048 |