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Mineralogical and P...
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Al-Ani, ThairGeological Survey of Finland (GTK), Espoo
(author)
Mineralogical and Petrographic Characteristics of Indium and REE-Bearing Accessory Phases in the Kymi Granite Stock, Southern Finland
- Article/chapterEnglish2018
Publisher, publication year, extent ...
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Scientific Research Publishing,2018
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electronicrdacarrier
Numbers
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LIBRIS-ID:oai:DiVA.org:ltu-67647
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https://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-67647URI
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https://doi.org/10.4236/nr.2018.92003DOI
Supplementary language notes
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Language:English
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Summary in:English
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Classification
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Subject category:ref swepub-contenttype
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Subject category:art swepub-publicationtype
Notes
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The Wiborg rapakivi batholith (1.64 Ga) in southeastern Finland with docu-mented occurrences of REE, indium and Zn-Cu-Pb sulphide mineralization was studied. Hydrothermal greisen and quartz vein type Fe-Sn and Zn-Cu-Pb are found in the Kymi granite stock as intrusions. They are enriched with in-dium and rare earth elements, with roquesite (CuInS2) being a major indium- carrier, whereas monazite (Ce), allanite (Ce), bastnäesite (Ce), xenotime-(Y) and thorite are the main REE carriers. Combination of optical and field emis-sion scanning electron microscopy (FE-SEM) and electron probe microanaly-sis (EPMA) were used to study the indium and REE-bearing mineral assem-blages. EPMA of roquesite found in galena had a composition of 26.16% S, 0.02% Fe, 25.06% Cu, 0.03% Zn, 1.06% As, 0.31% Sb and 47.14% In. Substitu-tion reaction Pb2+S2− ↔ Cu+In3+S2− is the cause of the incorporation of indium in the galena structure. The majority of the LREE are carried by monazite, bastnäesite and allanite, and the HREE by xenotime and zircon. There is a partial solid solution between monazite and xenotime with minor or trace amounts of LREE in xenotime grains (6.0 wt%). LREE (>95 mol% LREE) and less than 5 mol% HREE + Y reflects the enrichment of chondrite-normalized REE of the monazite grains of the Kymi granite stock. The xenotime grains (small and irregular) main composition contains 71 - 76 mol% YPO4, 16 - 27 mol% HREE, and 6 - 8 mol% LREE. It is believed that indium and REE-mineralization presence is due to the combination of magmatic and postmagmatic processes, particularly at later stages by fluid fractionation.
Subject headings and genre
Added entries (persons, corporate bodies, meetings, titles ...)
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Ahtola, TimoGeological Survey of Finland (GTK), Espoo
(author)
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Kuusela, JanneGeological Survey of Finland (GTK), Espoo
(author)
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Al-Ansari, NadhirLuleå tekniska universitet,Geoteknologi(Swepub:ltu)nadhir
(author)
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Geological Survey of Finland (GTK), EspooGeoteknologi
(creator_code:org_t)
Related titles
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In:Natural Resources: Scientific Research Publishing9:2, s. 23-412158-706X2158-7086
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