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OSL dating and luminescence characteristics of aeolian deposits and their source material in Dalarna, central Sweden

Alexanderson, Helena LU and Bernhardson, Martin LU (2016) In Boreas 45(4). p.876-893
Abstract

Aeolian dunes, coversands, glacifluvial deltas and paraglacial mass-movement deposits in Bonäsheden and Skattungheden in Dalarna, central Sweden were dated by optically stimulated luminescence (OSL) on quartz. The OSL ages confirm that the majority of the dunes started forming directly after deglaciation, as suggested by previous investigators. Dune formation seems to have lasted at least 1500 years, until c. 9 ka. Four younger episodes of sand drift resulting in coversand deposition were dated by OSL and/or radiocarbon to 4100±200 a, 1569–1412 cal. a BP, 970±60 a and 150±10 a. The youngest one is related to changes in land use, while the older ones may be due to regional climatic changes. The dated quartz had excellent luminescence... (More)

Aeolian dunes, coversands, glacifluvial deltas and paraglacial mass-movement deposits in Bonäsheden and Skattungheden in Dalarna, central Sweden were dated by optically stimulated luminescence (OSL) on quartz. The OSL ages confirm that the majority of the dunes started forming directly after deglaciation, as suggested by previous investigators. Dune formation seems to have lasted at least 1500 years, until c. 9 ka. Four younger episodes of sand drift resulting in coversand deposition were dated by OSL and/or radiocarbon to 4100±200 a, 1569–1412 cal. a BP, 970±60 a and 150±10 a. The youngest one is related to changes in land use, while the older ones may be due to regional climatic changes. The dated quartz had excellent luminescence characteristics; the luminescence was bright and dominated by the fast signal component, which made it possible to successfully analyse even untreated material, so-called range-finder dating. These characteristics are most likely inherited from one of the source rocks of the Quaternary deposits – the Mesoproterozoic Dala sandstone, which we show to also have very good luminescence properties.

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author
organization
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type
Contribution to journal
publication status
published
subject
in
Boreas
volume
45
issue
4
pages
18 pages
publisher
Taylor & Francis
external identifiers
  • Scopus:84979732344
ISSN
0300-9483
DOI
10.1111/bor.12197
language
English
LU publication?
yes
id
eccfcbf5-5eae-4552-ad17-8de0a2c7b45b
date added to LUP
2016-10-17 07:25:12
date last changed
2016-10-17 07:25:12
@misc{eccfcbf5-5eae-4552-ad17-8de0a2c7b45b,
  abstract     = {<p>Aeolian dunes, coversands, glacifluvial deltas and paraglacial mass-movement deposits in Bonäsheden and Skattungheden in Dalarna, central Sweden were dated by optically stimulated luminescence (OSL) on quartz. The OSL ages confirm that the majority of the dunes started forming directly after deglaciation, as suggested by previous investigators. Dune formation seems to have lasted at least 1500 years, until c. 9 ka. Four younger episodes of sand drift resulting in coversand deposition were dated by OSL and/or radiocarbon to 4100±200 a, 1569–1412 cal. a BP, 970±60 a and 150±10 a. The youngest one is related to changes in land use, while the older ones may be due to regional climatic changes. The dated quartz had excellent luminescence characteristics; the luminescence was bright and dominated by the fast signal component, which made it possible to successfully analyse even untreated material, so-called range-finder dating. These characteristics are most likely inherited from one of the source rocks of the Quaternary deposits – the Mesoproterozoic Dala sandstone, which we show to also have very good luminescence properties.</p>},
  author       = {Alexanderson, Helena and Bernhardson, Martin},
  issn         = {0300-9483},
  language     = {eng},
  month        = {10},
  number       = {4},
  pages        = {876--893},
  publisher    = {ARRAY(0xbbbd8f0)},
  series       = {Boreas},
  title        = {OSL dating and luminescence characteristics of aeolian deposits and their source material in Dalarna, central Sweden},
  url          = {http://dx.doi.org/10.1111/bor.12197},
  volume       = {45},
  year         = {2016},
}