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Apatite-iron oxide-hosted REE mineralisation at Kopslahyttan, NW Bergslagen, Sweden
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Mineralogy Petrology and Tectonics.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Mineralogy Petrology and Tectonics.
Geol Survey Sweden, SE-75128 Uppsala, Sweden.
Geol Survey Sweden, SE-75128 Uppsala, Sweden.
2015 (English)In: Mineral Resources In A Sustainable World / [ed] A-S André-Mayer, 2015, Vol. 1-5, 781-784 p.Conference paper, Published paper (Refereed)
Abstract [en]

Of the different types of REE mineralisation known from the Fennoscandian shield, the Palaeoproterozoic apatite-iron oxide ores of Kiruna type represent one resource type with significant potential. Here we describe an REE-rich apatite-magnetite mineralisation from the classic Bergslagen ore province in south central Sweden. Associated with moderately to weakly REE-enriched magnetite mineralisation of banded and vein types, the most apatite-rich occurrence at Kopslahyttan shows REE enrichment that is similar in both magnitude and pattern to other Kiruna type deposits. Yet, the present REE mineralogy is wholly dominated by monazite-(Ce), allanite-(Ce) and LREE-enriched epidote, the latter two often occurring as zoned crystals or aggregates. Minor xenotime-(Y) also occurs, and titanite locally hosts minor Y+HREE. The abundant fluorapatite is suggested to have been an additional, original host for REE, prior to fluid-mediated alteration leading to wholesale remobilisation of REE from the apatite. This remobilisation included dissolution-reprecipitation processes that lead to the nucleation of monazite in fluorapatite, but probably also further transport and precipitation as e.g. allanite/REE-epidote, through reactions with locally common silicates. In addition, we suggest that very coarse grained, variably Th-bearing monazite present in the mineralisation may have been a primary REE phase, in marked contrast to most other deposits of this type.

Place, publisher, year, edition, pages
2015. Vol. 1-5, 781-784 p.
Keyword [en]
REE; apatite-iron oxide; Kiruna type; Kopslahyttan; Bergslagen; Sweden
National Category
Geology
Research subject
Earth Science with specialization in Mineral Chemistry, Petrology and Tectonics
Identifiers
URN: urn:nbn:se:uu:diva-271009ISI: 000374801300177ISBN: 9782855550664 (print)OAI: oai:DiVA.org:uu-271009DiVA: diva2:891055
Conference
Mineral deposits in a sustainable world. 13th SGA biennial meeting 2015
Available from: 2016-01-05 Created: 2016-01-05 Last updated: 2016-07-26Bibliographically approved

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Jonsson, ErikHögdahl, Karin

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