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Book Chapter

Imaging fluvial architecture within a paleovalley fill using ground penetrating radar, Maple Creek, Guyana

By
Adrian S. Hickin
Adrian S. Hickin
School of Earth and Ocean Science, University of Victoria, PO Box 3055 STN CSC, Victoria British Columbia, V8W 3P6, Canada
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Peter T. Bobrowsky
Peter T. Bobrowsky
Geological Survey of Canada, 601 Booth Street, Ottawa Ontario, K1A 0E8, Canada
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Roger C. Paulen
Roger C. Paulen
Alberta Geological Survey, 4th Floor, Twin Atria Building, 4999-98 Avenue, Edmonton, Alberta, T6B 2X3, Canada
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Mel Best
Mel Best
Bemex Consulting International, 3701 Wild Berry Bend, Victoria, British Columbia, V9C 4M7, Canada
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Published:
January 01, 2007

A ground penetrating radar (GPR) survey was used to image the fluvial architecture within a buried paleovalley at Maple Creek, Guyana. The survey was part of a larger study of the stratigraphy and organization of fluvial elements within the valley fill. The survey consisted of 44 km of 50 and 100 MHz GPR profiles collected in a grid pattern. The 100 MHz antennae were used where depth to bedrock was less than 20 m, and the 50 MHz antennae were used where depth to bedrock exceeded 20 m. The survey grid consisted of 28 east-west–trending transects and 6 north-south–trending transects. East-west transects in the southern part of the study area were spaced 100 m apart. Those in the northern part of the study area were spaced 400 m apart, and north-south cross-transects were spaced at 500 m intervals. The survey imaged two strong reflectors interpreted to represent major bounding surfaces. The lower surface was confirmed to be the bedrock-sediment interface defining the valley boundary. The second major surface is the boundary between the fluvial valley fill and overlying bleached sand correlative with the White Sand Formation. In addition to the major surfaces, several minor surfaces were also imaged, resulting in the identification of 21 radar elements. Sixteen of the elements were interpreted to represent fluvial architectural elements. Four distinct morphological zones were recognized and were differentiated by variation in the geometry of the bedrock-sediment interface and by distinctive assemblages of architectural elements.

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Contents

GSA Special Papers

Stratigraphic Analyses Using GPR

Gregory S. Baker
Gregory S. Baker
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Harry M. Jol
Harry M. Jol
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Geological Society of America
Volume
432
ISBN print:
9780813724324
Publication date:
January 01, 2007

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