Rare Earth Elements Enrichment in the Upper Eocene Tošići-Dujići Bauxite Deposit, Croatia, and Relation to REE Mineralogy, Parent Material and Weathering Pattern

Tošići-Dujići bauxite deposit, situated in Dalmatian inlands, Croatia, contains minor remaining bauxite reserves. The deposit lies on Lower Eocene foraminiferal limestone and is covered by Upper Eocene Promina sediments. Bauxite samples were analyzed for textural, mineralogical, and geochemical feat...

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Autores principales:	Nenad Tomašić, Andrea Čobić, Matija Bedeković, Slobodan Miko, Nikolina Ilijanić, Nikola Gizdavec, Mario Matošević
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	karst bauxite rare earth elements enrichment rare earth elements mineralogy chemical weathering Mineralogy QE351-399.2
Acceso en línea:	https://doaj.org/article/2cbfb6c3de964137a1986a67ecb25d4b
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spelling	oai:doaj.org-article:2cbfb6c3de964137a1986a67ecb25d4b2021-11-25T18:26:40ZRare Earth Elements Enrichment in the Upper Eocene Tošići-Dujići Bauxite Deposit, Croatia, and Relation to REE Mineralogy, Parent Material and Weathering Pattern10.3390/min111112602075-163Xhttps://doaj.org/article/2cbfb6c3de964137a1986a67ecb25d4b2021-11-01T00:00:00Zhttps://www.mdpi.com/2075-163X/11/11/1260https://doaj.org/toc/2075-163XTošići-Dujići bauxite deposit, situated in Dalmatian inlands, Croatia, contains minor remaining bauxite reserves. The deposit lies on Lower Eocene foraminiferal limestone and is covered by Upper Eocene Promina sediments. Bauxite samples were analyzed for textural, mineralogical, and geochemical features in order to determine absolute REE abundances and their relation to mineralogy, as well as to devise the origin of REE enrichment and to trace weathering and bauxitization paths of the parent material. The samples show total REE abundances up to 3500 mg/kg with significant HREE enrichment in some cases. All samples are gibbsitic with hematite and anatase as major phases. Kaolinite occurs in most of the samples, and goethite, böhmite, and nordstrandite are minor phases. Monazite-(Ce) and xenotime-(Y) were identified as detrital REE minerals as well as authigenic florencite-(Ce). In the REE most abundant sample, REE are most likely bound to Fe- and Ti-oxide phases as suggested by correlation analysis. Chemical weathering proxies show intensive weathering. Geochemical and textural data imply that the REE enrichment is influenced by intensive weathering (CIA 97.87–99.26) of detrital material, and also by possible deposition/redeposition of residual material potentially derived and mobilized from various sedimentary rocks of the area.Nenad TomašićAndrea ČobićMatija BedekovićSlobodan MikoNikolina IlijanićNikola GizdavecMario MatoševićMDPI AGarticlekarst bauxiterare earth elements enrichmentrare earth elements mineralogychemical weatheringMineralogyQE351-399.2ENMinerals, Vol 11, Iss 1260, p 1260 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	karst bauxite rare earth elements enrichment rare earth elements mineralogy chemical weathering Mineralogy QE351-399.2
spellingShingle	karst bauxite rare earth elements enrichment rare earth elements mineralogy chemical weathering Mineralogy QE351-399.2 Nenad Tomašić Andrea Čobić Matija Bedeković Slobodan Miko Nikolina Ilijanić Nikola Gizdavec Mario Matošević Rare Earth Elements Enrichment in the Upper Eocene Tošići-Dujići Bauxite Deposit, Croatia, and Relation to REE Mineralogy, Parent Material and Weathering Pattern
description	Tošići-Dujići bauxite deposit, situated in Dalmatian inlands, Croatia, contains minor remaining bauxite reserves. The deposit lies on Lower Eocene foraminiferal limestone and is covered by Upper Eocene Promina sediments. Bauxite samples were analyzed for textural, mineralogical, and geochemical features in order to determine absolute REE abundances and their relation to mineralogy, as well as to devise the origin of REE enrichment and to trace weathering and bauxitization paths of the parent material. The samples show total REE abundances up to 3500 mg/kg with significant HREE enrichment in some cases. All samples are gibbsitic with hematite and anatase as major phases. Kaolinite occurs in most of the samples, and goethite, böhmite, and nordstrandite are minor phases. Monazite-(Ce) and xenotime-(Y) were identified as detrital REE minerals as well as authigenic florencite-(Ce). In the REE most abundant sample, REE are most likely bound to Fe- and Ti-oxide phases as suggested by correlation analysis. Chemical weathering proxies show intensive weathering. Geochemical and textural data imply that the REE enrichment is influenced by intensive weathering (CIA 97.87–99.26) of detrital material, and also by possible deposition/redeposition of residual material potentially derived and mobilized from various sedimentary rocks of the area.
format	article
author	Nenad Tomašić Andrea Čobić Matija Bedeković Slobodan Miko Nikolina Ilijanić Nikola Gizdavec Mario Matošević
author_facet	Nenad Tomašić Andrea Čobić Matija Bedeković Slobodan Miko Nikolina Ilijanić Nikola Gizdavec Mario Matošević
author_sort	Nenad Tomašić
title	Rare Earth Elements Enrichment in the Upper Eocene Tošići-Dujići Bauxite Deposit, Croatia, and Relation to REE Mineralogy, Parent Material and Weathering Pattern
title_short	Rare Earth Elements Enrichment in the Upper Eocene Tošići-Dujići Bauxite Deposit, Croatia, and Relation to REE Mineralogy, Parent Material and Weathering Pattern
title_full	Rare Earth Elements Enrichment in the Upper Eocene Tošići-Dujići Bauxite Deposit, Croatia, and Relation to REE Mineralogy, Parent Material and Weathering Pattern
title_fullStr	Rare Earth Elements Enrichment in the Upper Eocene Tošići-Dujići Bauxite Deposit, Croatia, and Relation to REE Mineralogy, Parent Material and Weathering Pattern
title_full_unstemmed	Rare Earth Elements Enrichment in the Upper Eocene Tošići-Dujići Bauxite Deposit, Croatia, and Relation to REE Mineralogy, Parent Material and Weathering Pattern
title_sort	rare earth elements enrichment in the upper eocene tošići-dujići bauxite deposit, croatia, and relation to ree mineralogy, parent material and weathering pattern
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/2cbfb6c3de964137a1986a67ecb25d4b
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Rare Earth Elements Enrichment in the Upper Eocene Tošići-Dujići Bauxite Deposit, Croatia, and Relation to REE Mineralogy, Parent Material and Weathering Pattern

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