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

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The Geological Survey of Canada's Palliser Triangle Global Change Project: a multidisciplinary geolimnological approach to predicting potential global change impacts on the Northern Great Plains

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

Content Provider	Springer Nature Link
Author	Xia, J. Haskell, B. J. Engstrom, D. R. Ito, E.
Copyright Year	1997
Abstract	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 δ$^{18}$O, δ$^{13}$C, 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 δ$^{18}$O, 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 δ$^{13}$C shows a ong-term increasing trend during the Holocene, which suggests that lake productivity and atmospheric CO$_{2}$ exchange made greater contributions to the hypolimnetic carbon pool as the lake became shallower with time.
Starting Page	85
Ending Page	100
Page Count	16
File Format	PDF
ISSN	09212728
Journal	Journal of Paleolimnology
Volume Number	17
Issue Number	1
e-ISSN	15730417
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	1997-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Geochemistry Hydrogeology Meteorology/Climatology Sedimentology Hydrobiology
Content Type	Text
Resource Type	Article
Subject	Earth-Surface Processes Aquatic Science

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