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Mineralogy and Petrology

, 94:195 | Cite as

Chemical composition of tourmaline from the Asarcık Pb–Zn–Cu ± U deposit, Şebinkarahisar, Turkey

  • F. YavuzEmail author
  • Y. Fuchs
  • N. Karakaya
  • M. Ç. Karakaya
Original Paper

Abstract

Abundant tourmaline, commonly as rosettes up to 1.5 cm in diameter, is present in the Upper Cretaceous Asarcık granitoid (Şebinkarahisar), Northeastern Turkey. The tourmalines also occur in quartz–tourmaline veins up to 4 m thick that cut the Asarcık granitoid. This granitoid was emplaced in the eastern Pontide Metallogenic Belt, where accompanying tourmalines are found in close association with a vein-type, uranium-bearing Pb–Zn–Cu deposit. Tourmaline crystals are generally optically zoned from core to rim with a bluish green core. Electron-microprobe studies show that tourmalines from the Asarcık granitoid and quartz–tourmaline veins display mainly dravite–schorl solid solutions with a tendency to schorl compositions. The tourmaline from the Asarcık granitoid has Fe/(Fe + Mg) ratios from 0.28 to 0.69 (mean = 0.52) and Na/(Na + Ca) ratios from 0.57 to 0.93 (mean = 0.76). In contrast, tourmaline in the quartz–tourmaline veins has Fe/(Fe + Mg) ratio from 0.14 to 0.92 (mean = 0.59) and Na/(Na + Ca) ratio from 0.78 to 1.00 (mean = 0.96). Tourmaline in the veins has a more alkali-deficient trend than that in the granitoid. Substitution mechanisms for the chemical evolution of tourmalines at Asarcık are the MgFe−1, (Fe2+Fe3+)(MgAl)−1, □Al(NaR)−1, AlOR2+ −1(OH)−1, □Al2ONa−1R2+ −2(OH)−1, Ca0.50.5Na−1, CaMg2−1Al−2, CaMgO□−1Al−1(OH)−1, CaMg3OH□−1Al−3O−1, CaMgNa−1Al−1, CaONa(OH)−1, CaMg2OHNa−1Al−2O−1, CaMg2−1Al−2, and CaMg3OH□−1Al−3O−1 exchange vectors. Chemical zoning in the tourmalines is consistent with these substitutions. Stoichiometric calculations of electron-microprobe data in the Asarcık granitoid suggest a relatively oxidizing environment during tourmaline crystallization.

Keywords

Tourmaline Magmatic Rock Massive Sulfide North Anatolian Fault Exchange Vector 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

We thank an anonymous referee for advice on the manuscript and the Chief Editor Johann G. Raith for his careful reading and editorial handling. We are very grateful to referee John F. Slack for his constructive comments and suggestions that greatly improved the manuscript.

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Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  • F. Yavuz
    • 1
    Email author
  • Y. Fuchs
    • 2
  • N. Karakaya
    • 3
  • M. Ç. Karakaya
    • 3
  1. 1.Department of GeologyIstanbul Technical UniversityIstanbulTurkey
  2. 2.Université Marne La ValleeMarne LaValleeFrance
  3. 3.Selçuk Üniversitesi, Mühendislik Mimarlık Fakültesi, Jeoloji Mühendisliği BölümüKonyaTurkey

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