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Late Pleistocene and Holocene climate and geomorphic histories as interpreted from a 23,000 14C yr B.P. paleosol and floodplain soils, southeastern West Virginia, USA

Published online by Cambridge University Press:  20 January 2017

Steven G. Driese*
Affiliation:
Department of Geology, Baylor University, Waco, TX 76798-7354, USA
Zheng-Hua Li
Affiliation:
Department of Earth and Planetary Sciences, University of Tennessee, Knoxville, TN 37996-1410, USA
Sally P. Horn
Affiliation:
Department of Geography, University of Tennessee, Knoxville, TN 37996-0925, USA
*
*Corresponding author. Fax: +1 254 710 2673.E-mail addresses:Steven_Driese@baylor.edu (S.G. Driese), zli@utk.edu (Z.-H. Li), shorn@utk.edu (S.P. Horn).

Abstract

Field, micromorphological, pollen, whole soil (XRF), and stable isotope geochemical methods were used to evaluate the latest Pleistocene to Holocene climate record from a floodplain–terrace system in southeastern West Virginia. A late Pleistocene (22,940 ± 150 14C yr B.P.) silt paleosol with low-chroma colors formed from fluviolacustrine sediment deposited during the last glacial maximum (Wisconsinan) and records a cooler full-glacial paleoclimate. Fluvial gravel deposited between the latest Pleistocene and earliest Holocene (prior to 6360 ± 40 14C yr B.P.) was weathered in the middle Holocene under warmer, drier climate conditions, possibly correlated with the Hypsithermal and Altithermal Events of the eastern and southwestern United States, respectively. The glacial to interglacial climate shift is recorded by: (1) changes from a poorly drained landscape with fine-textured soil, characterized by high organic C and redoximorphic features related to Fe removal and concentration, to a well-drained, coarse-textured setting without gley and with significant argillic (Bt) horizon development; (2) changes from a high Zr and Ti silt-dominated parent material to locally derived, coarse fluvial gravels lower in Zr and Ti; (3) a shift from dominantly conifer and sedge pollen in the paleosol to a modern oak/hickory hardwood assemblage; and (4) a shift in δ13C values of soil organic matter from −28‰ to −24‰ PDB, suggesting an ecosystem shift from cooler, C3-dominated flora to one that was mixed C3 and C4, but still predominantly composed of C3 plants. A root-restrictive placic horizon developed between the late Pleistocene silt paleosol and the overlying fluvial gravel because of the high permeability contrast between the two textures of soil materials. This layer formed a barrier that effectively isolated the Pleistocene paleosol from later Holocene pedogenic processes.

Type
Research Article
Copyright
University of Washington

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