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Optical dating of relict sand wedges and composite-wedge pseudomorphs in Flanders (Belgium)

(2009) BOREAS. 38(1). p.160-175
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Abstract
We report on quartz Optically Stimulated Luminescence (OSL) dating of the infill of 14 relict sand wedges and composite-wedge pseudomorphs at 5 different sites in Flanders, Belgium. A laboratory dose recovery test indicates that the single-aliquot regenerative-dose (SAR) procedure is suitable for our samples (measured to a given dose ratio 0.980 +/- 0.005; n=139). Completeness of resetting of the wedge infill of two samples was confirmed by single-grain analyses. The suite of optical ages indicates that repeated thermal contraction cracking, degradation and infilling with wind-blown sediment appear to have been commonplace in Flanders during the Late Pleniglacial (Oxygen Isotope Stage 2; OIS2); more specifically, around the Last Glacial Maximum (LGM, similar to 21 kyr ago) and the transition period between the LGM and the start of the Lateglacial (similar to 15 kyr ago). Optical dating at one site has revealed two significantly older wedge levels, the younger inset into the older; the younger wedge has an age of 36 +/- 4 kyr (Middle Pleniglacial; OIS3), the older wedge 129 +/- 11 kyr, which points to formation during the Late Saalian (OIS6). Our OSL ages of the wedges and host sediments bracket formation of the BGB (Beuningen Gravel Bed: a widespread deflation horizon in northwestern Europe) at between similar to 15 and 18 kyr; this is in good agreement with previous OSL dating studies. We conclude that optical dating using quartz SAR OSL establishes an absolute chronology for these periglacial phenomena and allows secure palaeoenvironmental reconstructions to be made.
Keywords
SINGLE-GRAIN, RETROSPECTIVE DOSIMETRY, PLEISTOCENE MACKENZIE-DELTA, JUTLAND, DENMARK, QUARTZ, SEDIMENTS, LUMINESCENCE, WESTERN-EUROPE, DOSE-RATES

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Citation

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Chicago
Buylaert, Jan-Pieter, Gunther Ghysels, Andrew Murray, Kristina J Thomsen, Dimitri Vandenberghe, Frans De Corte, Irenée Heyse, and Peter Van den haute. 2009. “Optical Dating of Relict Sand Wedges and Composite-wedge Pseudomorphs in Flanders (Belgium).” Boreas 38 (1): 160–175.
APA
Buylaert, J.-P., Ghysels, G., Murray, A., Thomsen, K. J., Vandenberghe, D., De Corte, F., Heyse, I., et al. (2009). Optical dating of relict sand wedges and composite-wedge pseudomorphs in Flanders (Belgium). BOREAS, 38(1), 160–175.
Vancouver
1.
Buylaert J-P, Ghysels G, Murray A, Thomsen KJ, Vandenberghe D, De Corte F, et al. Optical dating of relict sand wedges and composite-wedge pseudomorphs in Flanders (Belgium). BOREAS. 2009;38(1):160–75.
MLA
Buylaert, Jan-Pieter, Gunther Ghysels, Andrew Murray, et al. “Optical Dating of Relict Sand Wedges and Composite-wedge Pseudomorphs in Flanders (Belgium).” BOREAS 38.1 (2009): 160–175. Print.
@article{786818,
  abstract     = {We report on quartz Optically Stimulated Luminescence (OSL) dating of the infill of 14 relict sand wedges and composite-wedge pseudomorphs at 5 different sites in Flanders, Belgium. A laboratory dose recovery test indicates that the single-aliquot regenerative-dose (SAR) procedure is suitable for our samples (measured to a given dose ratio 0.980 +/- 0.005; n=139). Completeness of resetting of the wedge infill of two samples was confirmed by single-grain analyses. The suite of optical ages indicates that repeated thermal contraction cracking, degradation and infilling with wind-blown sediment appear to have been commonplace in Flanders during the Late Pleniglacial (Oxygen Isotope Stage 2; OIS2); more specifically, around the Last Glacial Maximum (LGM, similar to 21 kyr ago) and the transition period between the LGM and the start of the Lateglacial (similar to 15 kyr ago). Optical dating at one site has revealed two significantly older wedge levels, the younger inset into the older; the younger wedge has an age of 36 +/- 4 kyr (Middle Pleniglacial; OIS3), the older wedge 129 +/- 11 kyr, which points to formation during the Late Saalian (OIS6). Our OSL ages of the wedges and host sediments bracket formation of the BGB (Beuningen Gravel Bed: a widespread deflation horizon in northwestern Europe) at between similar to 15 and 18 kyr; this is in good agreement with previous OSL dating studies. We conclude that optical dating using quartz SAR OSL establishes an absolute chronology for these periglacial phenomena and allows secure palaeoenvironmental reconstructions to be made.},
  author       = {Buylaert, Jan-Pieter and Ghysels, Gunther and Murray, Andrew  and Thomsen, Kristina J and Vandenberghe, Dimitri and De Corte, Frans and Heyse, Iren{\'e}e and Van den haute, Peter},
  issn         = {0300-9483},
  journal      = {BOREAS},
  keyword      = {SINGLE-GRAIN,RETROSPECTIVE DOSIMETRY,PLEISTOCENE MACKENZIE-DELTA,JUTLAND,DENMARK,QUARTZ,SEDIMENTS,LUMINESCENCE,WESTERN-EUROPE,DOSE-RATES},
  language     = {eng},
  number       = {1},
  pages        = {160--175},
  title        = {Optical dating of relict sand wedges and composite-wedge pseudomorphs in Flanders (Belgium)},
  url          = {http://dx.doi.org/10.1111/j.1502-3885.2008.00037.x},
  volume       = {38},
  year         = {2009},
}

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