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GPR surveys of vegetated linear dune stratigraphy in central Australia; evidence for linear dune extension with vertical and lateral accretion

C. S. Bristow, B. G. Jones, G. C. Nanson, C. Hollands, M. Coleman and D. M. Price
GPR surveys of vegetated linear dune stratigraphy in central Australia; evidence for linear dune extension with vertical and lateral accretion (in Stratigraphic analyses using GPR, Gregory S. Baker (editor) and Harry M. Jol (editor))
Special Paper - Geological Society of America (2007) 432: 19-33

Abstract

Linear dunes are the most abundant type of desert dune and the dominant landform on the continent of Australia. This paper reports the results of GPR surveys across linear dunes in the deserts of central Australia including parts of the Simpson and Strzelecki deserts. The GPR data suffered from severely limited penetration and poor resolution due to signal attenuation associated with a high proportion of mud, which, probably due to progressive illuviation, increases with dune age. However, although such conditions prevail in much of central Australia, useful stratigraphic information can still be obtained there using GPR. Buried palaeosol horizons within dunes have been identified, and taken in conjunction with thermoluminescence (TL) ages from the dunes, it is possible to make some interpretations of linear dune evolution. TL ages show that some dunes are older in the south and young toward the north. It is possible to place some constraints on rates of vertical, lateral, and dune-front accretion within the linear dunes with approximately 2-6 m, 0-50 m and 3000 m, respectively, over the last ca. 10 ka. The combination of GPR profiles and TL dating of linear dunes in the Simpson and Strzelecki deserts confirms Holocene modification of preexisting linear dunes with minor easterly accretion that has contributed to the asymmetry of vegetated linear dunes in central Australia. The results support the hypothesis that linear dunes in Australia are composite forms with a long and sometimes complex history.


ISSN: 0072-1077
EISSN: 2331-219X
Coden: GSAPAZ
Serial Title: Special Paper - Geological Society of America
Serial Volume: 432
Title: GPR surveys of vegetated linear dune stratigraphy in central Australia; evidence for linear dune extension with vertical and lateral accretion
Title: Stratigraphic analyses using GPR
Author(s): Bristow, C. S.Jones, B. G.Nanson, G. C.Hollands, C.Coleman, M.Price, D. M.
Author(s): Baker, Gregory S.editor
Author(s): Jol, Harry M.editor
Affiliation: Birkbeck University of London, School of Earth Sciences, London, United Kingdom
Affiliation: University of Tennessee, Department of Earth and Planetary Sciences, Knoxville, TN, United States
Pages: 19-33
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: 37
Accession Number: 2008-086305
Categories: Applied geophysicsGeomorphology
Document Type: Serial Conference document
Bibliographic Level: Analytic
Illustration Description: illus. incl. sects., sketch maps
S23°41'60" - S23°41'60", E133°52'00" - E133°52'00"
S28°15'49" - S28°15'49", E140°28'13" - E140°28'13"
Secondary Affiliation: University of Wisconsin at Eau Claire, USA, United StatesUniversity of Wollongong, AUS, Australia
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 200826
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