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Geochemistry: Exploration, Environment, Analysis

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Geochemistry and mineral phases of REE in Jammi carbonatite veins and fenites, southern end of the Sokli complex, NE Finland

Thair Al Ani and Olli Sarapää
Geochemistry: Exploration, Environment, Analysis, 13, 217-224, 9 July 2013, https://doi.org/10.1144/geochem2011-088
Thair Al Ani
1Geological Survey of Finland, FI-02151 Espoo
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  • For correspondence: thair.alani@gtk.fi
Olli Sarapää
2Geological Survey of Finland, FI-96101 Rovaniemi
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Abstract

The Jammi area consists of Archaean mafic volcanic rock and tonalitic gneiss, which were intruded by the Devonian Sokli carbonatite, causing large-scale and intense fenitization of the country rocks. The rocks are albite-fenites, crosscutting late carbonatite veins, with the mineral assemblages of calcite-dolomite-aegirine-albite-apatite-phlogopite.

Geochemical analyses indicate that the total content of rare earth elements (REE) in the carbonatite veins is 0.11–1.83%, including 0.11–1.81% LREE and 0.002–0.041% HREE. Seven rare earth minerals have been analysed in detail from the area, including Sr-apatite, monazite, ancylite (Ce), bastnäsite (Ce), strontianite, baryte and brabanite.

The Jammi carbonatite and fenite samples display similar REE patterns, with highest enrichment of LREE, and steep slopes towards the HREEs. The REE distribution in the whole-rock data is controlled by carbonates and apatite. REE-rich accessory phases such as monazite and ancylite (Ce) influence the REE pattern only when present in large amounts.

Mineralogical and chemical evidence demonstrates that hydrothermal processes were responsible for the REE mineralization. During late-stage processes, apatite and carbonate minerals were replaced by various assemblages of REE–Sr–Ba minerals. Apatite could be a potential source for REE as a by-product of phosphate production in the Sokli area.

  • Jammi
  • Sokli
  • carbonatite
  • albite-fenite
  • Sr-apatite
  • strontianite
  • baryte and REE-rich minerals
  • © 2013 AAG/Geological Society of London
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Geochemistry: Exploration, Environment, Analysis: 13 (3)
Geochemistry: Exploration, Environment, Analysis
Volume 13, Issue 3
August 2013
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Geochemistry and mineral phases of REE in Jammi carbonatite veins and fenites, southern end of the Sokli complex, NE Finland

Thair Al Ani and Olli Sarapää
Geochemistry: Exploration, Environment, Analysis, 13, 217-224, 9 July 2013, https://doi.org/10.1144/geochem2011-088
Thair Al Ani
1Geological Survey of Finland, FI-02151 Espoo
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • For correspondence: thair.alani@gtk.fi
Olli Sarapää
2Geological Survey of Finland, FI-96101 Rovaniemi
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site

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Geochemistry and mineral phases of REE in Jammi carbonatite veins and fenites, southern end of the Sokli complex, NE Finland

Thair Al Ani and Olli Sarapää
Geochemistry: Exploration, Environment, Analysis, 13, 217-224, 9 July 2013, https://doi.org/10.1144/geochem2011-088
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