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Three Compositional Varieties of Rare-Earth Element Ore: Eudialyte-Group Minerals from the Norra Kärr Alkaline Complex, Southern Sweden

Artikel i vetenskaplig tidskrift
Författare Axel S.L. Sjöqvist
David H. Cornell
Tom Andersen
Muriel Erambert
Mattias Ek
Magnus Leijd
Publicerad i Minerals
Volym 3
Nummer/häfte 1
Sidor 94-120
ISSN 2075-163X
Publiceringsår 2013
Publicerad vid Institutionen för geovetenskaper
Sidor 94-120
Språk en
Länkar dx.doi.org/10.3390/min3010094
Ämnesord eudialyte-group minerals; agpaitic rocks; nepheline syenite; rare-earth elements; Norra Kärr Alkaline Complex; SEM-EDS; WDS-EMP
Ämneskategorier Geovetenskap och miljövetenskap

Sammanfattning

Agpaitic nepheline syenites at the Norra Kärr Alkaline Complex, southern Sweden, are rich in zirconium and rare-earth elements (REE), which are mainly accommodated in eudialyte-group minerals (EGM). Norra Kärr hosts three compositionally distinct groups of EGM, which are complex zirconosilicates. Analyses of EGM by electron beam energy-dispersive (SEM-EDS) and wavelength-dispersive (WDS-EMP) X-ray microanalysis are presented and compared, complemented by whole-rock analyses. The SEM-EDS and WDS-EMP methods produce comparable results for most elements. Considering that most SEM instruments have a user-friendly EDS system, it is a useful tool for reconnaissance work in research and especially in exploration-related studies. The EGM evolved markedly from an initial Fe-rich and REE-poor, but HREE-dominated variety, to an intermediate Fe-Mn and HREE-rich one, and to a final Mn- and LREE-rich variety, which occur in rocks classified as lakarpite and grennaite. Based on the Mn/(Fe+Mn) ratios of the EGM, this trend is interpreted as a result of magmatic evolution. The threefold diversity of EGM presented in this work is much broader than has previously been documented.

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