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Open AccessArticle

Minerals of Rare Earth Elements in High-Phosphorus Ooidal Ironstones of the Western Siberia and Turgai Depression

1
Division for Geology, Tomsk Polytechnic University, 634050 Tomsk, Russia
2
V.S. Sobolev Institute of Geology and Mineralogy Siberian Branch Russian Academy of Sciences, 630090 Novosibirsk, Russia
3
Department of Geoscience, French-Azerbaijani University (UFAZ), Baku AZ1000, Azerbaijan
4
TESCAN Ltd., 195220 Saint-Petersburg, Russia
5
Division for Materials Science, School of Advanced Manufacturing Technologies, Tomsk Polytechnic University, 634050 Tomsk, Russia
*
Author to whom correspondence should be addressed.
Minerals 2020, 10(1), 11; https://doi.org/10.3390/min10010011
Received: 28 October 2019 / Revised: 16 December 2019 / Accepted: 20 December 2019 / Published: 21 December 2019
The aim of this research was to study the rare earth (REE) minerals in ooidal ironstone deposits of the West Siberian basin and the Turgai depression. Authigenic minerals (monazite and cerite) were described, and their main mineral form was identified as light rare earth element phosphate (LREE-phosphate) in this study. LREE-phosphate is included in ferruginous ooids, peloids, and oncoids and forms a consistent mineral association with Fe-hydroxides (goethite and its hydrated amorphous derivatives) and Fe-rich layered silicates (Fe-illite-smectite, chamosite, berthierine). The constancy of the mineral association in two deposits of different ages indicates a general mechanism behind the formation of these minerals. LREE-phosphates (authigenic monazite) are characterized by microscopic sizes (up to 24 μm), diverse morphology (mainly spherical or xenomorphic), and occupy spaces between the micro-cortex in ferruginous spheroids. This mineral can be found in other deposits of ooidal ironstone. According to its mineralogical and chemical characteristics, LREE-phosphate mainly belongs to the authigenic (nodular or “gray”) monazite. However, the incomplete (not 100%) correspondence of Kikuchi bands with the reference monazite does not allow its reliable identification. Based on its small size, chemical leaching or bacterial interaction is recommended to extract REE from ooidal ironstone while predicting the associated removal of phosphorus from iron ore due to its dominant phosphate mineral form. Ooidal ironstone should be considered a complex deposit and an unconventional natural type of REE ores as an example of the largest Bakchar and Lisakovsk deposits. View Full-Text
Keywords: rare earth elements; ooidal ironstones; phosphates; mineral association; complex deposit rare earth elements; ooidal ironstones; phosphates; mineral association; complex deposit
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Rudmin, M.; Reva, I.; Sokol, E.; Abdullayev, E.; Ruban, A.; Kudryavtsev, A.; Tolkachev, O.; Mazurov, A. Minerals of Rare Earth Elements in High-Phosphorus Ooidal Ironstones of the Western Siberia and Turgai Depression. Minerals 2020, 10, 11.

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