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Loess–paleosol carbonate clumped isotope record of late Pleistocene–Holocene climate change in the Palouse region, Washington State, USA

Published online by Cambridge University Press:  05 July 2018

Alex R. Lechler ,
Katharine W. Huntington ,
Daniel O. Breecker ,
Mark R. Sweeney  and
Andrew J. Schauer
Alex R. Lechler*
Affiliation:
Department of Geosciences, Pacific Lutheran University, Tacoma, Washington 98447, USA
Katharine W. Huntington
Affiliation:
Department of Earth and Space Sciences, University of Washington, Seattle, Washington 98195, USA
Daniel O. Breecker
Affiliation:
Department of Geological Sciences, Jackson School of Geosciences, University of Texas at Austin, Austin, Texas 78712, USA
Mark R. Sweeney
Affiliation:
Department of Sustainability and Environment, University of South Dakota, Vermillion, South Dakota 57069, USA
Andrew J. Schauer
Affiliation:
Department of Earth and Space Sciences, University of Washington, Seattle, Washington 98195, USA
*
*Corresponding author at: Department of Geosciences, Pacific Lutheran University, Rieke 158, Tacoma, Washington 98447, USA. E-mail address: [email protected] (A.R. Lechler).
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Abstract

The Channeled Scabland–Palouse region of the Pacific Northwest (PNW) of the United States preserves geomorphic and pedosedimentary records that inform understanding of late Pleistocene–Holocene paleoclimate change in a region proximal to the last glacial period Cordilleran Ice Sheet. We present a clumped (Δ47) and conventional (δ18O, δ13C) isotopic study of Palouse loess–paleosol carbonates in combination with carbonate radiocarbon (14C) dating to provide new measures of regional late–last glacial (~31–20 cal ka BP) and Holocene soil conditions. Average clumped isotope temperatures (T(Δ47)) for last glacial Palouse loess–paleosol carbonates (9±4°C) are significantly lower than those for Holocene-aged carbonates (T(Δ47)=18±2°C) in study sections. Calculated soil water δ18OVSMOW values (−16±2‰) for last glacial carbonates are also offset relative to those for Holocene-aged samples (−11±1‰), whereas calculated soil CO2 δ13CVPDB values are similar for the Holocene (−16.9±0.2‰) and late–last glacial (−16.7±1.1‰) periods. Together, these paleoclimate metrics indicate late–last glacial conditions of pedogenic carbonate formation in the C3 grassland soils of the Palouse were measurably colder (9±5°C) than during the Holocene and potentially reflect a more arid last glacial paleoclimate across the Palouse, findings in agreement with previous proxy studies and climate model simulations for the region.

Keywords

LoessPaleosolPalouseClumped isotopePedogenic carbonateLGM, Paleoclimate
Type
Research Article
Information
Quaternary Research , Volume 90 , Issue 2 , September 2018 , pp. 331 - 347
Copyright
Copyright © University of Washington. Published by Cambridge University Press, 2018 

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