Apatite-iron oxide-hosted REE mineralisation at Kopslahyttan, NW Bergslagen, Sweden

Jonsson, Erik (author): Uppsala universitet,Mineralogi, petrologi och tektonik

Högdahl, Karin (author): Uppsala universitet,Mineralogi, petrologi och tektonik

Persson Nilsson, Katarina (author): Geol Survey Sweden, SE-75128 Uppsala, Sweden

(creator_code:org_t)

2015
2015
English.
In: Mineral Resources In A Sustainable World. - 9782855550664 ; , s. 781-784

Abstract Subject headings

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.

By the author/editor: Jonsson, Erik; Högdahl, Karin; Persson Nilsson, ...; Hellström, Fredr ...

About the subject

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