Inland dunes and cover sand in southern Sweden and Norway – evidence of late glacial and historical aeolian activity

Helena Alexanderson, Martin Bernhardson, Mona Henriksen, Leif V Jakobsen, Rajendra Shrestha

Research output: Contribution to conferenceAbstractpeer-review

Abstract

Aeolian deposits in Sweden and Norway are poorly explored as environmental records. Many, mainly small, occurrences of windblown sand have been mapped, but few have been investigated in any detail and even fewer have been absolutely dated. Here we present results from a project aiming to determine the timing and magnitude of wind activity in inland settings in southern Sweden and Norway and to better understand the aeolian impact on the landscape. By the end of this year, four areas will have been investigated: three inland dune fields (Bonäsheden, Brattforsheden, Starmoen) and one cover sand site (Blentarp). Our work includes geomorphological mapping, sedimentological and stratigraphic studies, ground penetrating radar investigations, and luminescence and radiocarbon dating. Aeolian sand is in most areas found on top of glaciofluvial sediments that were deposited during deglaciation. Cover sand is generally thin, but can reach 1-2 m thickness in depressions and may contain palaeosols. Most dunes are transverse, and can be used to infer palaeowind directions. Luminescence dating shows that the first aeolian deposition took place during or right after deglaciation, and that the main part of the sand was deposited within a few thousand years after deglaciation. This confirms the supposed deglaciation age of the oldest aeolian deposits based mainly on their geomorphological context. In at least two of the areas (Brattforsheden and Blentarp), aeolian sand has been reactivated at least once during historical times (<500 years ago). This is likely mainly due to human impact, such as expansion of agriculture or mining.
Original languageEnglish
Pages148-148
Publication statusPublished - 2014
Event31st Nordic Geological Winter Meeting, 2014 - Lund, Sweden
Duration: 2014 Jan 82014 Jan 10
Conference number: 31
http://geologiskaforeningen.se/31winter.html

Conference

Conference31st Nordic Geological Winter Meeting, 2014
Country/TerritorySweden
CityLund
Period2014/01/082014/01/10
Internet address

Subject classification (UKÄ)

  • Geology

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