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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EDP Sciences
2019
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Online Access: | https://doi.org/10.1051/e3sconf/20199805011 https://www.e3s-conferences.org/articles/e3sconf/pdf/2019/24/e3sconf_wri-162018_05011.pdf https://doaj.org/article/4fc7faf75b154a68857ae2445786af80 |
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fttriple:oai:gotriple.eu:oai:doaj.org/article:4fc7faf75b154a68857ae2445786af80 2023-05-15T15:02:52+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 2019-01-01 https://doi.org/10.1051/e3sconf/20199805011 https://www.e3s-conferences.org/articles/e3sconf/pdf/2019/24/e3sconf_wri-162018_05011.pdf https://doaj.org/article/4fc7faf75b154a68857ae2445786af80 en fr eng fre EDP Sciences 2267-1242 doi:10.1051/e3sconf/20199805011 https://www.e3s-conferences.org/articles/e3sconf/pdf/2019/24/e3sconf_wri-162018_05011.pdf https://doaj.org/article/4fc7faf75b154a68857ae2445786af80 undefined E3S Web of Conferences, Vol 98, p 05011 (2019) geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2019 fttriple https://doi.org/10.1051/e3sconf/20199805011 2023-01-22T19:19:11Z 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 Unknown Arctic Sakha E3S Web of Conferences 98 05011 |
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English French |
topic |
geo envir |
spellingShingle |
geo envir 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 |
geo envir |
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://www.e3s-conferences.org/articles/e3sconf/pdf/2019/24/e3sconf_wri-162018_05011.pdf 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 |
2267-1242 doi:10.1051/e3sconf/20199805011 https://www.e3s-conferences.org/articles/e3sconf/pdf/2019/24/e3sconf_wri-162018_05011.pdf https://doaj.org/article/4fc7faf75b154a68857ae2445786af80 |
op_rights |
undefined |
op_doi |
https://doi.org/10.1051/e3sconf/20199805011 |
container_title |
E3S Web of Conferences |
container_volume |
98 |
container_start_page |
05011 |
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1766334784806584320 |