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Karakterisering av REE-förande mineral från Flintgruvan: en sydlig utlöpare av Falufältet i norra Bergslagen?
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences.
2016 (Swedish)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [sv]

Bergslagen är känt för sin mångfald av mineraliseringar liksom sällsynta element och mineral. Speciellt pegmatiter och vissa skarnförekomster har förhöjda koncentrationer av sällsynta jordartsmetaller (REE på engelska) och REE-förande mineral. Pegmatitprover från Flintgruvan, som ligger i norra Bergslagen (Dalarna), karakteriserades i den här studien. Proven som studerades innehöll flera REE-förande mineral; (Y,REE,U,Th)-(Nb,Ta,Ti)-oxider av AB2O6-typ, xenotim-(Y) och (Y,Yb)-förande thorit. Pegmatiten klassificerades som varandes av NYF-(Niob-Yttrium-Fluor) typ på grund av de förhöjda koncentrationerna av niob (Nb), yttrium (Y) och titan (Ti) i de undersökta faserna. Förutom yttrium så innehöll pegmatiten små koncentrationer av andra HREE (tunga sällsynta jordartsmetaller) som ytterbium (Yb) och dysprosium (Dy). (Y,REE,U,Th)-(Nb,Ta,Ti)-oxiderna innehöll även relativt höga halter av kisel (Si). På basis av de kemiska analyserna representerar dessa strakt omvandlade faser antingen aeschynit eller polykras som ursprungsmineral. Undersöknings- och analysmetoderna som användes i studien var polarisationsmikroskopi och svepelektronmikroskopi med energidispersiv spektroskopi (SEM-EDS).

Abstract [en]

Bergslagen is known for its diversity of rare elements and minerals. Especially granitic pegmatites and some uncommon types of skarn deposits have shown higher concentrations of rare earth elements (REE) and REE-bearing minerals. Samples of a granitic pegmatite from Flintgruvan, which is located in northern Bergslagen (Dalarna), were characterized in this study. The samples that were studied were found to contain several REE-rich minerals such as (Y,REE,U,Th)-(Nb,Ta,Ti) oxides of AB2O6 type, xenotime-(Y) and an Y+Yb-bearing thorite. The most abundant AB2O6 type oxides were found to represent strongly altered minerals, either belonging to the aeschynite or polycrase group. Based on mineral chemical studies, the pegmatite was classified as being of the NYF (Niobium-Yttrium-Fluorine) type due to the predominance of yttrium (Y) and niobium (Nb) as well as notable titanium (Ti) concentrations. Other than yttrium the samples contained small concentrations of other HREE (heavy rare earth elements) such as ytterbium (Yb) and dysprosium (Dy). The (Y,REE,U,Th)-(Nb,Ta,Ti) oxides also contained a relatively high content of silicon (Si). The mineralogical characterization was done by means of reflected polarized light microscopy and scanning electron microscopy with energy dispersive spectroscopy (SEM-EDS). 

Place, publisher, year, edition, pages
2016. , 36 p.
Series
, Självständigt arbete vid Institutionen för geovetenskaper, 2016:33
Keyword [sv]
REE-mineral, pegmatit, Flintgruvan, Bergslagen, optisk mikroskopi, (Y, REE, U, Th)-(Nb-Ta-Ti)-oxider, aeschynit, polykras
National Category
Geology Geochemistry
Identifiers
URN: urn:nbn:se:uu:diva-301156OAI: oai:DiVA.org:uu-301156DiVA: diva2:953827
Subject / course
Geophysical Science (HGO)
Educational program
Bachelor Programme in Earth Science
Presentation
2016-05-31, Hambergsalen, Institutionen för geovetenskaper, Villavägen 16, Uppsala, 13:40 (Swedish)
Supervisors
Examiners
Available from: 2016-08-20 Created: 2016-08-18 Last updated: 2016-08-20Bibliographically approved

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