Holocene Chronology of the Brattforsheden Delta and Inland Dune Field, Sw Sweden

Alexanderson, Helena; Fabel, Derek

doi:10.1515/geochr-2015-0001

Cited by 21 publications

(53 citation statements)

References 52 publications

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“…Similar results regarding the timing of dune formation have also been gained from two relatively nearby dune fields, Brattforsheden and Starmoen (Fig. A), 160 km S and W, respectively, from Bonäsheden (Alexanderson & Fabel ; Alexanderson & Henriksen ), as well as from dune fields in other previously glaciated areas (Hilgers ; Munyikwa et al . ; Halfen et al .…”

Section: Discussionsupporting

confidence: 80%

“…Similar results regarding the timing of dune formation have also been gained from two relatively nearby dune fields, Brattforsheden and Starmoen (Fig. 1A), 160 km S and W, respectively, from Bon€ asheden (Alexanderson & Fabel 2015;Alexanderson & Henriksen 2015), as well as from dune fields in other previously glaciated areas (Hilgers 2007;Munyikwa et al 2011;Halfen et al 2015). Just after deglaciation, the climate was fairly cold, (katabatic) winds were strong, vegetation was scarce or non-existent, and plenty of sand was available in newly exposed glacifluvial deposits, all factors that promote sand drift and dune formation (Pye & Tsoar 2012).…”

Section: Early Holocene Dune Formationsupporting

confidence: 81%

“…The duration of the dune-forming phase at Bon€ asheden and Skattungheden thus was at least c. 1500 years, possibly longer if the older OSL ages are taken at face value. This is similar to Brattforsheden (at least 2000 years; Alexanderson & Fabel 2015) but longer than at Starmoen (at most a few hundred years; Alexanderson & Henriksen 2015).…”

Section: Early Holocene Dune Formationsupporting

confidence: 73%

mentioning

confidence: 99%

“…Different types of luminescence dating (thermoluminescence, TL; optically stimulated luminescence, OSL; infrared stimulated luminescence, IRSL) have been applied to dunes in Fennoscandia, mainly in Denmark (e.g. Murray & Clemmensen 2001;Clemmensen & Murray 2006) but also in Norway (Alexanderson & Henriksen 2015), Sweden (Lundqvist & Mejdahl 1987Alexanderson & Fabel 2015) and Finland (Clarke & K€ ayhk€ o 1997;K€ ayhk€ o et al 1999;Matthews & Sepp€ al€ a 2014). Only a few of these studies have, however, focussed on inland dunes and been extensive enough to allow the establishment of timing and duration of dune-forming events.…”

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confidence: 99%

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

Alexanderson

Bernhardson

2016

Boreas

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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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Section: Discussionsupporting

confidence: 80%

Section: Early Holocene Dune Formationsupporting

confidence: 81%

Section: Early Holocene Dune Formationsupporting

confidence: 73%

mentioning

confidence: 99%

mentioning

confidence: 99%

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

Alexanderson

Bernhardson

2016

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Age, formation and significance of loess deposits in central Sweden

Stevens

Sechi

Tziavaras

et al. 2022

Earth Surf Processes Landf

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Loess deposits are common in the mid-latitudes and are excellent records of past climate, landscape change and dust. However, loess deposits are seldom reported from Fennoscandia. Here we investigate two former glaciofluvial areas in central Sweden, Brattforsheden and Bonäsheden, where post-glacial loess and sand dune activity have been documented previously. Based on detailed mapping, grain size, scanning electron microscopy and optically stimulated luminescence dating analyses, we confirm the presence of loess deposits at the sites and extend the known area of loess coverage. Our results suggest that loess deposits are more common than previously thought in Sweden. The results also demonstrate that basal parts of the loess are often mixed with underlying sediment, which may be a common feature of thin loess deposits close to former ice margins. Quartz luminescence is well suited for dating these deposits, but ages from the mixed basal loess layers are older than expected, while ages from undisturbed loess extend to c. 5 ka. The loess ages contrast with the timing of main dune activity in these areas, which is dominantly in the 1-3 kyr postdeglaciation (c. 10.9-10.5 cal kyr BP). We suggest that either sediment mixing during soil formation is responsible for the mid-Holocene loess ages, or that the loess deposits record periodic landscape destabilization into the mid-Holocene. Furthermore, there is a clear topographic control on aeolian sedimentary facies, with loess mantling high ground and dunes restricted to valleys. Loess deposits are also primarily found to the south and southwest of source areas, implying transport from the north and east. This pattern contrasts with evidence for NW winds inferred from associated sand dunes. At present, the reasons for this mismatch are unclear, although one possible explanation is that silts deposited at higher elevations were affected by Ekman flow deflection of NW surface winds.

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Parabolic dune distribution, morphology and activity during the last 20 000 years: A global overview

Vimpere

2023

Earth Surf Processes Landf

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Parabolic dunes form and migrate in almost every climate and geographic zones of the world, ranging from the tropical coastlines to the arid continental deserts. Despite their extensive distribution and their importance within the aeolian sediment landscape, the understanding of their morphological development, activity and link with climates remains somewhat limited to local or regional scales. A good understanding of the present climate conditions under which parabolic dunes are formed and/or reactivated would be significantly helpful to constrain past climate models. Similarly, an improved knowledge of parabolic dunes behaviour during past climatic episodes would provide some valuable long‐term data to better predict their future activity. This review first aims at providing a non‐exhaustive global database on parabolic dune morphology and the present wind regimes with which they are associated. To do so, the morphology of 750 dunes distributed worldwide was first analysed using a high‐resolution global digital elevation model, suggesting an intrinsic relationship between the different measured morphoparameters. The analysis of the associated local wind regimes shows that parabolic dunes develop under strong unidirectional winds, which are more conspicuous in coastal than continental environments. Dunes of different ages are globally aligned with present prevailing winds, which suggests a prevalent control of long‐term global atmospheric circulation on dune orientations. Finally, this study explores the link between parabolic dune activity and climates over the past 20 000 years by reviewing ages from the literature and combining them with the ones compiled in the INQUA Dunes Atlas Chronologic Database. Overall, it appears that changes towards drier conditions have triggered dunes migration during both warm and cold periods of the Last Glacial Maximum, Holocene Climate Optimum, Roman Climate Optimum, Medieval Climate Optimum and Little Ice Age. The present day aeolian activity is predominantly linked with deteriorating environmental conditions caused by human disturbances.

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Holocene Chronology of the Brattforsheden Delta and Inland Dune Field, Sw Sweden

Cited by 21 publications

References 52 publications

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

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

Age, formation and significance of loess deposits in central Sweden

Parabolic dune distribution, morphology and activity during the last 20 000 years: A global overview

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