Holocene climate reconstructions from tandem trace-element and stable-isotope composition of ostracodes from Coldwater Lake, North Dakota, U.S.A.

J. Xia, B. J. Haskell, D. R. Engstrom, E. Ito

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The geochemistry of ostracode shells and bulk carbonates in a 19-meter sediment core documents at century-scale resolution the evolution of water chemistry in Coldwater Lake, North Dakota, providing a continuous paleohydrologic record of Holocene climate change in the northern Great Plains. A combination of δ18O, δ13C, Mg/Ca and Sr/Ca in ostracode calcite aided by Sr/Ca in bulk carbonates are used to constrain the paleoclimatic reconstructions. A fresh-water phase in the early Holocene, indicated by the absence of Candona rawsoni and low concentrations of Sr/Ca in bulk carbonate, was followed by a sharp increase in salinity between 10 800 and 8900 yr B.P. The climate was predominately dry during the late part of the early Holocene and most of the middle Holocene (8900-5000 yr B.P.), when the lake was very sensitive and recorded a series of dry and wet oscillations. Maximum salinity occurred around 5500 yr B.P. and was followed by a gradual decrease between 5000 and 2400 yr B.P. From 2400 yr B.P. the δ18O, Mg/Ca, and Sr/Ca in the ostracodes indicate generally wet conditions interrupted by a series of lesser salinity and temperature oscillations lasting until 600 yr B.P. Ostracode geochemistry indicates that a warm and dry climate returned at about the time of the Little Ice Age (600-150 yr B.P.). Ostracode δ13C shows a long-term increasing trend during the Holocene, which suggests that lake productivity and atmospheric CO2 exchange made greater contributions to the hypolimnetic carbon pool as the lake became shallower with time.

Original languageEnglish (US)
Pages (from-to)85-100
Number of pages16
JournalJournal of Paleolimnology
Issue number1
StatePublished - 1997

Bibliographical note

Funding Information:
We thank E. Grimm for supplying the cores used in this study, D. Verschuren for describing sediment lithology, M. Abbott for preparation of samples for AMS 14C analyses, O. Olson and M. Miller for ostracode sieving and identification, R. Knurr for ICP-MS analyses, and R. McEwan for help in isotope determinations. H. E. Wright, S. C. Fritz, and B. L. Valero-Garces provided helpful discussions that improved the manuscript. This research was supported by grants for the NSF Climate Dynamics Program (ATM-9005875) and NOAA Climate and Global Change Program (NA36GP0302). The stable-isotope laboratory was partly supported by NSF Research Training Group grant (BIR-9014277). Contribution 479, Limnological Research Center.


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