Title

A High-Resolution Record of Holocene Climate Change in Speleothem Calcite from Cold Water Cave, Northeast Iowa

Document Type

Article

Peer Reviewed

1

Publication Date

12-1-1992

Journal/Book/Conference Title

Science

Abstract

High-precision uranium-thorium mass spectrometric chronology and $^{18}$O-$^{13}$C isotopic analysis of speleothem calcite from Cold Water Cave in northeast lowa have been used to chart mid-Holocene climate change. Significant shifts in $\delta^{18}$O and $\delta^{13}$C isotopic values coincide with well-documented Holocene vegetation changes. Temperature estimates based on $^{18}$O/$^{16}$O ratios suggest that the climate warmed rapidly by about 3°C at 5900 years before present and then cooled by 4°C at 3600 years before present. Initiation of a gradual increase in $\delta^{13}$C at 5900 years before present suggests that turnover of the forest soil biomass was slow and that equilibrium with prairie vegetation was not attained by 3600 years before present.

Keywords

Sustainability

Published Article/Book Citation

Science, 258:5088 (1992) pp. 1626-1630.

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URL

https://ir.uiowa.edu/geology_pubs/124