Karadeniz Bölgesinde Akgüney (Ordu) Cu-Pb-Zn Yatağının Kükürt ve Kurşun İzotop Bileşimleri

Akgüney Cu-Pb-Zn yatağı, Karadeniz Bölgesi’nde bulunan bir damar tipi hidrotermal Cu-Pb-Zn yatağıdır. Bu yatak, Üst Kretase yaşlı andezitik kayaçlar içinde bulunur. Yatak çeşitli kalınlıklarda yedi damardan oluşur. Birincil mineral parajenezi pirit, galenit, kalkopirit, sfalerit, fahlerz, kuvars ve kalsit içerir. Sülfürlü minerallerin (pirit, kalkopirit, sfalerit ve galenit) δ34S değerleri -0.63 ‰ ila 3.02 ‰ arasında değişmekte olup ortalama 1.22 ‰’dır. Hidrotermal çözelti içerisindeki H2S’in hesaplanan δ34SH2S değerleri ve sülfürlü minerallerin δ34S değerleri kükürtün kökeninin homojen bir magmatik kaynak olduğunu düşündürmektedir. Galenit örnekleri 206Pb/204Pb için 18.533-18.745, 207Pb/204Pb için 15.633-15.657 ve 208Pb/204Pb için 38.710-38.772 değerlerine sahiptir. Bu değerler kurşun için orojenik kökenli bir kaynak önermektedir.

Sulfur and Lead Isotopic Compositions of the Akgüney (Ordu) Cu-Pb-Zn Deposit in the Black Sea Region, Turkey

he Akgüney Cu-Pb-Zn deposit is a vein type hydrothermal Cu-Pb-Zn deposit in the Black Sea Region of Turkey. This deposit is hosted by Upper Cretaceous andesitic rocks. The deposit consists of seven veins with varying thicknesses in the investigated area. The primary mineral paragenesis includes pyrite, galena, chalcopyrite, sphalerite, fahlore, quartz and calcite. The δ34S values of sulfide minerals (pyrite, chalcopyrite, sphalerite and galena) range from -0.63 ‰ to 3.02 ‰, with an average of 1.22 ‰. These δ34S values and the calculated δ34SH2S values for H2S dissolved in hydrothermal fluids are suggesting a homogeneous magmatic source. The galena samples have 206Pb/204Pb ratios from 18.533 to 18.745, 207Pb/204Pb ratios from 15.633 to 15.657 and 208Pb/204Pb ratios from 38.710 to 38.772. These values suggest an orogenic source for lead.

___

  • Akıncı, T.Ö., 1985. The Eastern Pontide volcano-se-dimentary belt and associated massive sul-fide deposits. İn: Dixon JE, Robertson AHF, editors. The Geological Evolution of the Eastern Mediterranean. Special Publication of the Geological Society 17. Oxford: Black-well.
  • Demir, Y., Uysal, İ., Sadıklar, M.B., Ceriani, A., Hanilçi, N. and Müller, D., 2015. Mineralogy, mineral chemistry, fluid inclusion, and stable isoto-pe investigations of the Kabadüz ore veins, Ordu, NE-Turkey. Ore Geology Reviews, 66, 82-98.
  • Eyüboğlu, Y., Santosh, M., Yi, K., Tüysüz, N., Kork-maz, S., Akaryalı, E., Dudas, F.O. and Bektas, O., 2014. The Eastern Black Sea-type volcanogenic massive sulfide deposits: Geochemistry, zircon U–Pb geochronology and an overview of the geodynamics of ore genesis. Ore Geology Reviews, 59, 29-54.
  • Gökce, A., 1990. Sulfur isotope study of Cu-Zn-Pb deposits of the Kurşunlu (Ortakent-Koyulhi-sar-SIVAS). MTA Bulletin, 111, 111-118.
  • Gökce, A. and Bozkaya, G., 2006. Lead and sulfur isotope evidence for the origin of the Inler Yaylası lead-zinc deposits, Northern Turkey. Journal Asian Earth Science, 26, 91-97.
  • Grassineau, N.V., Mattey, D.P. and Lowry, D., 2001. Sulfur isotope analysis of sulfide and sulfate minerals by continuous flow-isotope ratio mass spectrometry. Analytical Chemistry, 73, 220-225.
  • Köse, M., 1987. Geological investigation of the Pb – Zn – Cu veins Akgüney – Kabadüz (Ordu) area. M.Sc, KTÜ, Trabzon, Turkey.
  • Okay, A.I., 1996. Granulite facies gneisses from the Pulur Region, Eastern Pontides. Turkish Jo-urnal of Earth Sciences, 5, 55–61.
  • Okay, A.I. and Şahintürk, Ö., 1997. Geology of the Eastern Pontides. In: Robinson, A. (Ed.), Re-gional and Petroleum Geology of the Black Sea and Surrounding Regions. AAPG Me-moir, 68, 291–311.
  • Stacey, J.S. and Kramers, J.D., 1975. Approximation of the terrestrial lead isotope evolution by a two-stage model. Earth and Planetary Sci-ence Letters, 26, 207-221.
  • Steinmann, M., and Emerson, C., 2001, Technical reports on the geology, reserves and dril-ling program of the North Turkey Project: Zamanti, Zamanti Mining Company, 15 p (unpublished).
  • Terlemez, İ. and Yılmaz, A., 1980. Stratigraphy of the area between Ünye-Ordu-Koyulhisar-Reşa-diye. Bulletin of the Geological Society of Turkey 23, 179-191.
  • Ünal, E., Gökce, A. and Harris, C., 2009. Microther-mometric and O- and H-isotope characte-ristics of the mineralizing fluid in the Akgü-ney copper–lead–zinc deposit, NE Turkey. International Geology Review, 51, 375-387.
  • Woodhead, J.D. and Hergt, J.M., 1997. Application of “double spike” technique to Pb –isotope