Next Article in Journal / Special Issue
Mineralogy and Trace Element Chemistry of Ferberite/Reinite from Tungsten Deposits in Central Rwanda
Previous Article in Journal / Special Issue
High and Low Temperature Gold Mineralizations in the Fe–Cu–Zn Sulfide Deposits of Corchia Ophiolite, Northern Italian Apennine
Article

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

1
Department of Earth Sciences, University of Gothenburg, PO Box 460, SE-405 30 Göteborg, Sweden
2
Department of Geosciences, University of Oslo, PO Box 1047 Blindern, N-0316 Oslo, Norway
3
Tasman Metals Ltd., Skiftesvägen 14, SE-563 31 Gränna, Sweden
*
Author to whom correspondence should be addressed.
Minerals 2013, 3(1), 94-120; https://doi.org/10.3390/min3010094
Received: 8 December 2012 / Revised: 18 January 2013 / Accepted: 25 February 2013 / Published: 20 March 2013
(This article belongs to the Special Issue Advances in Economic Minerals)
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. View Full-Text
Keywords: eudialyte-group minerals; agpaitic rocks; nepheline syenite; rare-earth elements; Norra Kärr Alkaline Complex; SEM-EDS; WDS-EMP eudialyte-group minerals; agpaitic rocks; nepheline syenite; rare-earth elements; Norra Kärr Alkaline Complex; SEM-EDS; WDS-EMP
Show Figures

Figure 1

MDPI and ACS Style

Sjöqvist, A.S.L.; Cornell, D.H.; Andersen, T.; Erambert, M.; Ek, M.; Leijd, M. Three Compositional Varieties of Rare-Earth Element Ore: Eudialyte-Group Minerals from the Norra Kärr Alkaline Complex, Southern Sweden. Minerals 2013, 3, 94-120. https://doi.org/10.3390/min3010094

AMA Style

Sjöqvist ASL, Cornell DH, Andersen T, Erambert M, Ek M, Leijd M. Three Compositional Varieties of Rare-Earth Element Ore: Eudialyte-Group Minerals from the Norra Kärr Alkaline Complex, Southern Sweden. Minerals. 2013; 3(1):94-120. https://doi.org/10.3390/min3010094

Chicago/Turabian Style

Sjöqvist, Axel S.L., David H. Cornell, Tom Andersen, Muriel Erambert, Mattias Ek, and Magnus Leijd. 2013. "Three Compositional Varieties of Rare-Earth Element Ore: Eudialyte-Group Minerals from the Norra Kärr Alkaline Complex, Southern Sweden" Minerals 3, no. 1: 94-120. https://doi.org/10.3390/min3010094

Find Other Styles

Article Access Map by Country/Region

1
Only visits after 24 November 2015 are recorded.
Back to TopTop