Open AccessStrontium isotopic composition in waters of mud volcanoes of Azerbaijan
Author(s) -
M. I. Bujakaite,
V. Yu. Lavrushin,
B. G. Pokrovsky
Publication year - 2019
Publication title -
litologiâ i poleznye iskopaemye
Language(s) - English
Resource type - Journals
ISSN - 0024-497X
DOI - 10.31857/s0024-497x20195391-403
Subject(s) - geology , terrigenous sediment , isotopes of strontium , geochemistry , strontium , sedimentary rock , volcano , mud volcano , δ18o , volcanic rock , stable isotope ratio , chemistry , physics , organic chemistry , quantum mechanics
The isotopic composition of strontium was studied in the waters of 22 Azerbaijan mud volcanoes, in which the isotope composition of oxygen and hydrogen, as well as the concentration of macro and micro elements, was previously [Lavrushin et al., 2015] determined. 87Sr/86Sr ratios in the waters of Azerbaijan mud volcanoes are within 0.70670.7083. The minimum ratio was established in Neftechala Yuzhnaya volcano, located in the south of the territory ‒ in the Kura region, which is characterized by the lowest average values of 87Sr/86Sr = 0.70700.0003 and 18O = 2.01.8 compared to volcanoes situated northern ‒ in Shemakha ‒ Gobustan, Absheron and Caspian regions (87Sr/86Sr average = 0.70760.0005, 18O average = 4.82.5). The relation between the strontium isotopic composition and the isotopic composition of oxygen suggests that the formation of the isotopic characteristics of the mud volcanic waters of Azerbaijan involves two main sources, one of which is predominantly associated with sedimentary carbonates of Cretaceous-Paleogene age, and the second, prevailing in the Kura region, has traces of isotopic exchange with volcanic rocks. The role of strontium dissolved in the sea water, as well as strontium, which could be extracted from modern terrigenous sediments of the Caspian Sea and terrigenous clay rocks of the Maikop series in the mud volcanic waters of Azerbaijan is insignificant.