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Combining ground penetrating radar surveys and optical dating to determine dune migration in Namibia

C.S. Bristow, N. Lancaster and G.A.T. Duller
Journal of the Geological Society, 162, 315-321, 1 March 2005, https://doi.org/10.1144/0016-764903-120
C.S. Bristow
11School of Earth Sciences, Birkbeck University of London, Malet Street, London WC1E 7HX, UK (e-mail: c.bristow@ucl.ac.uk)
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N. Lancaster
22Desert Research Institute, 2215 Raggio Parkway, Reno, NV89512, USA
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G.A.T. Duller
33Institute of Geography and Earth Sciences, University of Wales, Aberystwyth SY23 3DB, UK
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Abstract

Ground penetrating radar (GPR) profiles across a complex linear dune in the Namib Sand Sea have been used to image sets of cross-stratification and their bounding surfaces. A combination of radar facies analysis and radar stratigraphy has been used to interpret the radar profiles and define a relative chronology. Thick sets of cross-stratification indicate when the dune was most active, whereas thin sets of cross-stratification are interpreted to indicate the increased prevalence of wind reversals and lower rates of dune migration, with bounding surfaces formed during periods of stabilization, non-deposition or erosion. A drilling and dating campaign was designed on the basis of the dune stratigraphy as defined by the GPR survey. Sampling was targeted at large sets of cross-stratification formed when the dunes were most active, and avoiding bounding surfaces formed when the dune was stable or even eroded. The results from optical dating give ages between 0.34 ± 0.02 ka and 1.57 ± 0.07 ka, indicating a time-averaged dune migration rate of 0.12 m a−1 over the past 1600 years.

  • Holocene
  • Namib desert
  • GPR
  • OSL
  • stratigraphy
  • aeolian dune migration
  • © 2005 The Geological Society of London
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Journal of the Geological Society: 162 (2)
Journal of the Geological Society
Volume 162, Issue 2
March 2005
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Combining ground penetrating radar surveys and optical dating to determine dune migration in Namibia

C.S. Bristow, N. Lancaster and G.A.T. Duller
Journal of the Geological Society, 162, 315-321, 1 March 2005, https://doi.org/10.1144/0016-764903-120
C.S. Bristow
11School of Earth Sciences, Birkbeck University of London, Malet Street, London WC1E 7HX, UK (e-mail: c.bristow@ucl.ac.uk)
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N. Lancaster
22Desert Research Institute, 2215 Raggio Parkway, Reno, NV89512, USA
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G.A.T. Duller
33Institute of Geography and Earth Sciences, University of Wales, Aberystwyth SY23 3DB, UK
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Combining ground penetrating radar surveys and optical dating to determine dune migration in Namibia

C.S. Bristow, N. Lancaster and G.A.T. Duller
Journal of the Geological Society, 162, 315-321, 1 March 2005, https://doi.org/10.1144/0016-764903-120
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