Geochemistry and Nd, Sr isotopes of the Pohrenk fluorites (Kırsehir-Turkey)


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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°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 143Nd/144Nd values of between 0.512349 and 0.512497, whilst 87Sr/86Sr 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.

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Y. Uras

Department of Geological Engineering, Avsar Campus

编辑信件的主要联系方式.
Email: yuras@ksu.edu.tr
土耳其, Kahramanmaras

A. Nikiforov

Insitute of Geology of Ore Deposits, Petrography Mineralogy and Geochemistry

Email: yuras@ksu.edu.tr
俄罗斯联邦, Moscow, 119017

F. Oner

Department of Geological Engineering, Ciftlik Campus

Email: yuras@ksu.edu.tr
土耳其, Mersin

O. Parlak

Department of Geological Engineering, Balcali Campus

Email: yuras@ksu.edu.tr
土耳其, Adana

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