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Fluid–rock reactions in the 1.3 Ga siderite carbonatite of the Grønnedal–Íka alkaline complex, Southwest Greenland

  • E. Ranta
  • G. Stockmann
  • T. Wagner
  • T. Fusswinkel
  • E. Sturkell
  • E. Tollefsen
  • A. Skelton
Original Paper
  • 290 Downloads

Abstract

Petrogenetic studies of carbonatites are challenging, because carbonatite mineral assemblages and mineral chemistry typically reflect both variable pressure–temperature conditions during crystallization and fluid–rock interaction caused by magmatic–hydrothermal fluids. However, this complexity results in recognizable alteration textures and trace-element signatures in the mineral archive that can be used to reconstruct the magmatic evolution and fluid–rock interaction history of carbonatites. We present new LA–ICP–MS trace-element data for magnetite, calcite, siderite, and ankerite–dolomite–kutnohorite from the iron-rich carbonatites of the 1.3 Ga Grønnedal–Íka alkaline complex, Southwest Greenland. We use these data, in combination with detailed cathodoluminescence imaging, to identify magmatic and secondary geochemical fingerprints preserved in these minerals. The chemical and textural gradients show that a 55 m-thick basaltic dike that crosscuts the carbonatite intrusion has acted as the pathway for hydrothermal fluids enriched in F and CO2, which have caused mobilization of the LREEs, Nb, Ta, Ba, Sr, Mn, and P. These fluids reacted with and altered the composition of the surrounding carbonatites up to a distance of 40 m from the dike contact and caused formation of magnetite through oxidation of siderite. Our results can be used for discrimination between primary magmatic minerals and later alteration-related assemblages in carbonatites in general, which can lead to a better understanding of how these rare rocks are formed. Our data provide evidence that siderite-bearing ferrocarbonatites can form during late stages of calciocarbonatitic magma evolution.

Keywords

Carbonatites Ferrocarbonatite Metasomatism LA–ICP–MS Grønnedal–Íka 

Notes

Acknowledgements

The work was financially supported by the Bolin Centre for Climate Research at Stockholm University. The core samples of this study were taken with permission from the Mineral License and Safety Authority (MLSA), Government of Greenland with license no. 032/2014. We thank Helena Korkka (University of Helsinki) and our late friend Dan Zetterberg (Stockholm University) for the preparation of thin and thick sections. The help and support of Radoslaw Michallik (University of Helsinki) during EPMA analysis is greatly appreciated. Dina Schultze (University of Helsinki) is thanked for her help with the CL imaging and useful comments on the interpretation of CL effects in carbonates. We acknowledge the smooth editorial handling by Hans Keppler and thank Michael Marks and an anonymous reviewer for their constructive comments which helped to improve the manuscript.

Supplementary material

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Supplementary material 1 (PDF 151 KB)
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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • E. Ranta
    • 1
    • 2
  • G. Stockmann
    • 3
  • T. Wagner
    • 4
  • T. Fusswinkel
    • 4
  • E. Sturkell
    • 5
  • E. Tollefsen
    • 6
  • A. Skelton
    • 6
  1. 1.Nordic Volcanological Center, Institute of Earth SciencesUniversity of IcelandReykjavíkIceland
  2. 2.Department of Geosciences and GeographyUniversity of HelsinkiHelsinkiFinland
  3. 3.Institute of Earth SciencesUniversity of IcelandReykjavíkIceland
  4. 4.Institute of Applied Mineralogy and Economic GeologyRWTH Aachen UniversityAachenGermany
  5. 5.Department of Earth SciencesUniversity of GothenburgGothenburgSweden
  6. 6.Department of Geological SciencesStockholm UniversityStockholmSweden

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