Vital isotopic δ18O offset in Ostracods of the Caspian Sea region
https://doi.org/10.55959/MSU0579-9414.5.79.6.4
Abstract
The paper examines the stable oxygen isotope values for six most abundant ostracod taxa in present-day Caspian Sea bottom sediments from 33 sampling sites. The oxygen isotopic composition of Caspian ostracod shells was found to reflect metabolic effects related to their life cycle. The average δ18Oost value (± standard deviation) for each species is as follows: −0,11‰ (±0,7) for Euxinocythere virgata, –0,25‰ (±1,14) for Tyrrhenocythere amnicola donetziensis, +2,94‰ (±0,16) for Candona schweyeri, +1,55‰ (±1,12) for Paracyprideis sp., +1,77‰ (±0,22) for Bakunella dorsoarcuata and +2,45‰ (±0,95) for Camptocypria sp. The results obtained confirmed that Caspian ostracods do not secrete their carapace in equilibrium with the surrounding water. Rather, the studied species showed a positive vital offset – the observed effect averaged about 1‰ (±0,5). The desired isotopic shift for the mixed ostracod assemblage turned out to be equivalent to the average isotopic shift for the studied sample and amounted to +1‰ (±0,5). The work demonstrates that ostracod metabolic processes cause shifts in the expected fractionation of oxygen isotopes between CaCO3 and water. The resulting isotope offsets must be taken into account in paleogeographic studies for correct interpretation of paleoclimatic changes in the Caspian Sea region using the stable oxygen isotope record.
Supporting agencies: The research was financially supported by the Russian Science Foundation (project 2477-00011).
About the Authors
A. A. Tkach
Lomonosov Moscow State University, Faculty of Geography, Laboratory of Recent Deposits and Pleistocene Palaeogeography
Russian Federation
Russian Federation
Junior Scientific Researcher, Ph.D. in Geography
N. T. Tkach
Lomonosov Moscow State University, Faculty of Geology, Department of Oil and Gas Sedimentology and Marine Geology
Russian Federation
Russian Federation
Engineer
M. A. Zenina
P.P. Shirshov Institute of Oceanology, Russian Academy of Science, Laboratory of Paleooceanology
Russian Federation
Russian Federation
Senior Scientifi c Researcher, Ph.D. in Biology
T. A. Yanina
Lomonosov Moscow State University, Faculty of Geography, Laboratory of Recent Deposits and Pleistocene Palaeogeography
Russian Federation
Russian Federation
Professor, Head of the Laboratory, D.Sc. in Geography
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For citations:
Tkach A.A., Tkach N.T., Zenina M.A., Yanina T.A. Vital isotopic δ18O offset in Ostracods of the Caspian Sea region. Lomonosov Geography Journal. 2024;(6):41–54. (In Russ.) https://doi.org/10.55959/MSU0579-9414.5.79.6.4
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