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Paleolake shoreline sequencing using ground-penetrating radar; Lake Alvord, Oregon, and Nevada

David E. Wilkins and William P. Clement
Paleolake shoreline sequencing using ground-penetrating radar; Lake Alvord, Oregon, and Nevada (in Stratigraphic analyses using GPR, Gregory S. Baker (editor) and Harry M. Jol (editor))
Special Paper - Geological Society of America (2007) 432: 103-110

Abstract

Field, map, and aerial photoreconnaissance in the Lake Alvord basin has focused on identifying late Pleistocene depositional shoreline features (e.g., tombolos, spits, barriers). Features in different areas of the basin are well defined, and their spatial extents are easily mapped; however, absolute-or even relative-ages of shoreline features are not clear. Ground penetrating radar (GPR) was used to distinguish between intermediate and highstand stage shorelines during what is thought to have been the latest Pleistocene, threshold-controlled lake cycle. Radar transects of 280 and 600 m imaged a spit and a baymouth barrier at sites in the northeastern quadrant of the basin where transects were aligned normal to the strike of each depositional geomorphic feature. Signal penetration with 100 MHz antennas was shallow ( approximately 4 m), but resolution was sufficient to locate and identify gross morphostratigraphic features. Flooding surfaces are shown to correspond to intermediate stage lake surface elevations, and the absence of a flooding surface at the elevation of the highest shoreline indicates this to be the maximum lake surface elevation during this cycle. Elevations of intermediate lake stage elevations and highstand stage elevations were consistent at the two sites, with the highstand elevations corresponding closely to the basin threshold at Big Sand Gap. These data provide a first-order approximation of lake stage sequence and the degree of postdepositional neotectonic activity and illustrate the utility of GPR when used in context with field measurements in distinguishing transgressive and highstand features.


ISSN: 0072-1077
EISSN: 2331-219X
Coden: GSAPAZ
Serial Title: Special Paper - Geological Society of America
Serial Volume: 432
Title: Paleolake shoreline sequencing using ground-penetrating radar; Lake Alvord, Oregon, and Nevada
Title: Stratigraphic analyses using GPR
Author(s): Wilkins, David E.Clement, William P.
Author(s): Baker, Gregory S.editor
Author(s): Jol, Harry M.editor
Affiliation: Boise State University, Department of Geosciences, Boise, ID, United States
Affiliation: University of Tennessee, Department of Earth and Planetary Sciences, Knoxville, TN, United States
Pages: 103-110
Published: 2007
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
ISBN: 978-0-8137-2432-4
Meeting name: Advances in stratigraphic analyses using ground penetrating radar, 2002 Geological Society of America annual meeting
Meeting location: Seattle, WA, USA, United States
Meeting date: 20031102Nov. 2-5, 2003
References: 27
Accession Number: 2008-086311
Categories: Quaternary geologyApplied geophysics
Document Type: Serial Conference document
Bibliographic Level: Analytic
Illustration Description: illus. incl. sects., sketch maps
N42°00'00" - N44°04'60", W119°55'00" - W118°10'00"
Secondary Affiliation: University of Wisconsin at Eau Claire, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 200826
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