NDLI: Oxygen isotope fractionation in three freshwater ostracod species from early Holocene lacustrine tufa in northern Estonia

Content Provider	Springer Nature Link
Author	Kalm, Volli Sohar, Kadri
Copyright Year	2009
Abstract	We quantified differences in oxygen isotope fractionation among three biostratigraphically important subfossil ostracod species (Metacypris cordata, Pseudocandona rostrata and Candonopsis kingsleii) from an early Holocene freshwater tufa layer in northern Estonia. Estimated mean δ$^{18}$O values are −10.05‰ for M. cordata, −9.34‰ for C. kingsleii and −8.75‰ for P. rostrata. All three species exhibit positive offset from the weighted mean annual δ$^{18}$O of contemporary precipitation (−10.7‰ in δ$^{18}$O$_{V-PDB}$) and from the mean δ$^{18}$O value of authigenic tufa carbonate (−10.64‰) in the ostracod-bearing layer. Assuming that the known oxygen isotope fractionation in P. rostrata (+2.5‰) and M. cordata (+1.5‰) has remained constant over time, the theoretical δ$^{18}$O$_{V-SMOW}$ of the early Holocene lake water was calculated to have been between −11.52 and −11.92‰, slightly less negative than the local Ordovician groundwater (−11.7 to −12.2‰). δ$^{18}$O values of the tufa carbonate differ by +0.6 to +1.0‰ from the calculated theoretical isotope composition (δ$^{18}$O$_{V-PDB}$) of lake water, indicating that the tufa also did not precipitate in isotopic equilibrium with ambient waters. Results show that the greater the δ$^{18}$O offset from the calculated, theoretical isotope composition of lake water for an ostracod species, the lower is its preferred mean July temperature. Both our data and earlier published results on δ$^{18}$O values in Holocene lacustrine carbonates and ostracods from north-eastern Europe, display pronounced decreases in δ$^{18}$O with an increase in latitude of the study site. This suggests that temperature-dependent, and therefore latitude-dependent isotopic composition of meteoric waters controlled the δ$^{18}$O values in lacustrine tufa and ostracods throughout the Holocene.
Starting Page	815
Ending Page	828
Page Count	14
File Format	PDF
ISSN	09212728
Journal	Journal of Paleolimnology
Volume Number	43
Issue Number	4
e-ISSN	15730417
Language	English
Publisher	Springer Netherlands
Publisher Date	2009-08-29
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Freshwater ostracods Oxygen isotopes Isotope fractionation Lacustrine carbonate Northern Estonia Geology Freshwater & Marine Ecology Physical Geography Climate Change Sedimentology Paleontology
Content Type	Text
Resource Type	Article
Subject	Earth-Surface Processes Aquatic Science

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