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Lithology and Mineral Resources

, Volume 40, Issue 2, pp 123–137 | Cite as

Isotopic composition of oxygen and hydrogen in mud-volcanic waters from Taman (Russia) and Kakhetia (Eastern Georgia)

  • V. Yu. Lavrushin
  • E. O. Dubinina
  • A. S. Avdeenko
Article

Abstract

The δ18O and δD values in mud-volcanic waters of the Taman Peninsula and Kakhetia vary from +0.7 to +10.0‰ and from −37 to −13‰ , respectively. These values increase as the Greater Caucasus is approached. The increase in δ18O and δD also positively correlates with fluid generation temperatures based on hydrochemical geothermometers. This is accompanied by changes in the chemical composition of waters, in which contents of alkali metals, HCO3 ion, and boron increase, while the content of halogen ions (Cl, Br, J) decreases. Changes in the isotopic composition of water are also accompanied by the increase of δ13 in methane and decrease of δ11 B in clays. Analysis of formal models of the evolution of isotopic composition of mud-volcanic waters showed that mud volcanoes are recharged by freshened water from the Maikop paleobasin with an inferred isotopic composition of δD ≈ −40‰ and δ18 O ≈ −6‰. Based on this assumption, the δ18O and δD values observed in mud-volcanic waters can be explained not only by processes of distillation and condensation in a closed system, but also by combined processes of isotopic reequilibration in the water-illite-methane system.

Keywords

Oxygen Hydrogen Clay Methane Boron 
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.

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Copyright information

© MAIK “Nauka/Interperiodica” 2005

Authors and Affiliations

  • V. Yu. Lavrushin
    • 1
  • E. O. Dubinina
    • 2
  • A. S. Avdeenko
    • 2
  1. 1.Geological Institute, Russian Academy of SciencesMoscowRussia
  2. 2.Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry, Russian Academy of SciencesMoscowRussia

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