Geochemistry and Nd, Sr Isotopes of the Pohrenk Fluorites (Kirsehir-Turkey)

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Uras Y., NIKIFOROV A. V. , Oner F., PARLAK O.

GEOCHEMISTRY INTERNATIONAL, vol.55, no.3, pp.263-281, 2017 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 55 Issue: 3
  • Publication Date: 2017
  • Doi Number: 10.1134/s0016702917030090
  • Page Numbers: pp.263-281


The Pohrenk fluorite mineralisation which makes up Central Anatolia's most extensive fluorite region is Lutetian aged, and hosted in carbonate rocks that have undergone occasional karstification and silicification along a N-S fault trend. Fluid inclusion values and the position of fluorites in the Tb/La-Tb/Ca diagram show that mineralisation occurred in a hydrothermal environment with homogenisation temperatures ranging from 78.1-363 degrees C. The presence of fluorite as a space filler in carbonate rocks and its association with silicification indicates that the solutions contained considerable amounts of Si alongside F (fluorine). The Pohrenk fluorite samples have Nd-143/Nd-144 values of between 0.512349 and 0.512497, whilst Sr-87/Sr-86 values vary between 0.708161 and 0.708772. These values indicate a mantle origin where continental contamination could occur. When the Nd-Sr values are compared to magmatic and young volcanics, the Pohrenk fluorites are seen to be enriched and exhibit similar isotopic signatures to Upper Cretaceous aged magmatics, Early-Middle Miocene volcanics and Mio-Quaternary volcanics.