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International Journal of Earth Sciences

, Volume 108, Issue 6, pp 2021–2035 | Cite as

Macro- and micro-scale study and chronology of Late Weichselian aeolian sediments in Estonia, north-eastern European Sand Belt

  • Edyta KalińskaEmail author
  • Tiit Hang
  • Argo Jõeleht
  • Sander Olo
  • Māris Nartišs
  • Grzegorz Adamiec
Open Access
Original Paper
  • 272 Downloads

Abstract

Patchy aeolian landforms, representing the NE part of the European Sand Belt, occur in NE Estonia, between the Gulf of Finland and Lake Peipsi. The dunes are restricted to the former glacial lakebed, thus lying directly in contact with glaciolacustrine sediments, and have so far prompted different opinions regarding their genesis and age. This study aims to answer these open questions regarding the age and origin of these landforms and to provide information on the associated past sedimentary processes. To achieve this, we combine macro-scale (sedimentary structures and ground-penetrating radar survey) and micro-scale (grain-size, shape and character of quartz grain surfaces and mineral composition) studies with optically stimulated luminescence dating. The glaciolacustrine fines in the study area are wavy stratified, with the occurrence of mica horizons and prevalence of quartz sand grains with aeolian characteristics. Therefore, these sediments argue for near-standing/low-energy water conditions in the glacial lake, where allochthonous material was delivered by wind. A fall in the lake level and the occurrence of dry land on the northern coast of the regressive Late Weichselian Lake Peipsi favoured aeolian activity from ca. 13.5 to 10.5 ka in the region. The aeolian accumulation was brief—as apparent from the results of the micro-scale study—and lacks evidence of sediment recycling. Only easily-removable mica was deflated at the end of the aeolian depositional phase. Aeolian activity terminated ca. 10.5 ka due to a rising groundwater level that is apparent from the onset of paludification in the region.

Keywords

Dune Aeolian sediments Grain size Quartz grain surfaces Mineral composition Optically stimulated luminescence dating European Sand Belt Estonia 

Introduction

Dunes, coversands and loess covers occur abundantly in the European lowlands and are important elements of the European Sand Belt (ESB; Koster 1988, 2009). These landforms and sediments formed during glacial events, when a decrease in precipitation, a scarcity of vegetation, and increasing wind speeds and frost abrasion resulted in a large amount of material being deposited from off the Scandinavian Ice Sheet (SIS) (Bertran et al. 2016).

While the western and central parts of this belt have been studied in some detail (Ujházy et al. 2003; Koster 2005; Bateman and Murton 2006; Kasse et al. 2007; Derese et al. 2009; Tolksdorf et al. 2010; Bertran et al. 2013, 2014; Vandenberghe et al. 2013; Obreht et al. 2015; Zieliński et al. 2015), its NE part has so far gained relatively little attention (Drenova et al. 1997; Zeeberg 1998; Kalińska-Nartiša et al. 2015a, b, 2016). This part of the belt is located entirely inside the maximum extent of the SIS, the sedimentary cover is patchy (Zeeberg 1993, 1998) and is restricted to basins within glacial lakebeds, outwash fans or glaciofluvial terraces (Guobytė and Satkūnas 2011). This is why aeolian landforms there differ from the largely continuous dunefields and coversands of Western-Central Europe, rather resembling the more scattered landforms found in Sweden (Alexanderson and Bernhardson 2016) and Finland (Käyhkö et al. 1999).

In this study, we focus on the patchy aeolian landforms between the Gulf of Finland and Lake Peipsi in NE Estonia. The dune area is entirely limited to the basin of a former glacial lakebed (Glacial Lake Peipsi), and thus might be expected to lie directly next to sediments of glaciolacustrine origin. The dunes in this region have already gained some attention (Raukas and Hütt 1988; Zeeberg 1998; Raukas 2011; Kalińska-Nartiša et al. 2015a; Ratas et al. 2015). However, different opinions exist regarding the genesis and age of these landforms. A morphological study by Rähni (1954) concluded with an inland dune theory, with the timing of formation being during the Younger Dryas cold period (Raukas et al. 1971). Kajak (1963) described the dunes as ancient coastal formations of Glacial Lake Peipsi. Raukas and Hütt (1988) and Karukäpp and Raukas (1999) considered these forms to be repeatedly reblown/reworked glaciolacustrine kames or crevasse fillings, respectively. Zeeberg (1998) and Kalińska-Nartiša et al. (2015a) placed these aeolian landforms into a wider context, describing them as part of the ESB. These numerous interpretations were developed from the facts that: (1) the principal internal architectures of landforms and substratum-dune governance had been largely unexplored, and (2) sedimentary data had been limited to only a few outcrops. The emphasis of this study is, therefore, placed on the Varesmetsa site, NE Estonia (Fig. 1), which is one of the few open sections presenting an aeolian succession with underlying glaciolacustrine fines. We use a multiproxy approach to study the substratum and dune sediment structures in outcrop and via ground-penetrating radar (GPR) (macro-scale study), alongside sediment properties, such as grain size, the shape and character of quartz grain surfaces, and the overall mineral composition (micro-scale study), to obtain more details about the possible source and distance of the aeolian transport. Several samples are also dated by a luminescence technique to contribute to the discussion about the correlation and timing of the aeolian activity in this area of the ESB. We additionally focus on adjacent landforms and their sediments, particularly in terms of landform internal architecture and sediment grain-size variation. The latter are complementary data from previous work at the Iisaku sites in this area (Kalińska-Nartiša et al. 2015a; Fig. 1). This combination of macro- and micro-scale studies of the past depositional conditions help us to address the open research questions regarding the age and genesis of these landforms. The new data provides information on the past sedimentary processes and palaeoenvironmental trends in the region, and help to correlate these forms with similar deposits in Europe.
Fig. 1

Location of the investigated site (Varesmetsa) and other sites with luminescence age determinations used in the text. Location of b is shown in a with a black square. Sites: 1—Kalińska-Nartiša et al. (2015a); 2—Kalińska-Nartiša et al. (2015b); 3—Kalińska-Nartiša et al. (2016); 4—Nartišs and Kalińska-Nartiša (2017); 5—Ratas et al. (2015); 6—Raukas and Hütt (1988); 7—this study. Quaternary sediment cover (according to Mardla 1967): bQ4—peat; eolQ3/4—aeolian sands; gQ3—glacial sediments; gfQ3—glaciofluvial sand and gravel; glQ3—glaciolacustrine sands. Digital terrain model for shaded relief—Estonian Land Board (2013)

Location and geological setting

A cross-section of the Varesmetsa dune was available during a 2011 fieldwork season in NE Estonia, north of Lake Peipsi, ca. 8 km east of the town of Iisaku. Two complementary Iisaku (1, 2) sites, also discussed herein, are located south of this town (Fig. 1). The investigated dune area lies outside of the deglacial Pandivere-Neva ice marginal zone of the Late Weichselian glaciation (Kalm 2006; Kalm et al. 2011), at a distance of only a few kilometres from the Iisaku-Illuka esker ridges. Indirect accelerator mass spectrometry radiocarbon (AMS 14C) ages positioned the Pandivere–Neva stadial in northern Estonia at 14,000–13,800 cal year BP (Amon et al. 2016). Varve chronology and a magnetostratigraphic study of the Pärnu area, western Estonia, placed the stagnation of the ice margin at the Pandivere–Neva line at ca. 13.9–13.8 ka BP (Hang et al. 2011).

The sediment cover in the environs of Varesmetsa consists of aeolian and peat series directly overlying the glaciolacustrine sediments of Glacial Lake Peipsi, which correlate with a Pandivere age (Hang 2001, 2003). The most outstanding glacial landforms are the aforementioned Iisaku-Illuka esker ridges, which bound the study area to the NW. These are up to 40 m high and are NE–SW-oriented parallel ridges consisting of pebbly gravel with boulders in the SW and gravelly sand in the NE part of the ridge system. Other features in the study area are 8–15 m high, rounded, plateau-like glaciolacustrine kames, individually occupying ca. 1–5 km2 footprints and possessing steep (25°) slopes. The kames mostly consist of laminated fine sand and silt.

A group of ca. 200 NE–SW-aligned ridge-like and parabolic dunes, with lengths of 0.15–3.3 km, widths from 20 to 120 m and heights of up to 10–15 m prevail in an area of ca. 50 km2. These landforms are covered by pine forests and are predominantly surrounded by vast wetlands, with up to a 10 m thick peat cover. The landform orientations and 3°–18°-slanting concave windward slopes reveal a W–NW palaeowind direction (Zeeberg 1998).

The studied Varesmetsa dune is located in the NW part of the dune field, standing apart from the largest group of dunes a few km to the NE and the Iisaku-Illuka esker ridges at 4–5 km to the W–NW. The dune is ca. 800 m long, 50–120 m wide, and its relative height reaches 8 m (Fig. 2a, b). With its NE–SW orientation, it crosses one of the plateau-like kames (Fig. 2c). This is why the altitude of the dune foot varies from 45 to 51 m a.s.l., while the relative height of the landform is relatively stable. The highest point of the dune is at an altitude of 59.8 m a.s.l. The 9°–11°-slanting windward slope faces NW and is more indented compared to the straight and steeper, 18°–21°-slanting leeward slope, towards the SE. From here on, we use the terms ‘Aeolian 1’ and ‘Aeolian 2’ for the sequences of sediments on the windward and leeward slopes, respectively. The cross-section of the dune was located in its northern part (59°6′52″N, 27°23′51″E; Fig. 1), and was 120 m long and up to 9 m high, with the section opening towards the north. Glaciolacustrine fines (Glaciolacustrine sequence), as the substrate, were exposed in the NW peripheral part of the section, while inclined—low (Aeolian 1) and high (Aeolian 2)—stratifications of aeolian sands were exposed in the main part of the outcrop (Table 1; Fig. 2). Complementary to the Varesmetsa site are the Iisaku (1, 2) sites, which have already gained some attention (Kalińska-Nartiša et al. 2015a), but were also considered in this study (see “Methodology”). The dune-foot altitude at these sites varies between 45 and 48 m a.s.l., and their crests reach an altitude of 49.3 (Iisaku 1) and 58.9 (Iisaku 2) m a.s.l., thus being similar to the Varesmetsa dune. Mostly, tabular cross- and low-angled inclined stratification occurs at Iisaku 1, with large-scale inclined stratification at Iisaku 2 (Kalińska-Nartiša et al. 2015a).
Fig. 2

a Elevation model of the Varesmetsa dune and its surroundings (based on the LiDAR data from Estonian Land Board), b longitudinal profile of the Varesmetsa dune, c cross-section of dune at the Varesmetsa site with investigated profiles and samples distribution

Table 1

Details about sediment sequences as distinguished at Varesmetsa

Sediment sequences

Profile number

Sediment description

Type of deposition

Glaciolacustrine

1–3

Sub-horizontally laminated fines and sands

Low-energy water conditions

Aeolian 1

4

Sand with low-angle inclined stratification

Windward slope

Aeolian 2

5–9

Sand with high-angle inclined stratification

Leeward slope

Earlier sediment age determinations

Several attempts at determining the aeolian chronology have already been made for the study area (see Supplementary Table S1 for details). For example, thermoluminescence (TL) and infrared optically stimulated luminescence (IRSL) age determinations have obtained a range of 13.6 ± 1.5 to 3.0 ± 0.5 ka (Raukas and Hütt 1988). However, of these ages, only those between 4.0 ± 0.5 and 7.1 ± 0.7 ka were considered to be reliable, due to the age-depth inversion (Raukas 1999, 2011).

A more recent set of ages cluster into four groups (Supplementary Table S1): (1) 13.3 ± 1.2 ka; (2) between 12.7 ± 0.8 and 12.5 ± 0.8 ka; (3) between 11.5 ± 0.7 and 10.9 ± 0.8 ka; and (4) 10.5 ± 0.7 ka. These were obtained using post-infrared pulsed blue OSL (Kalińska-Nartiša et al. 2015a). A relatively new study by Ratas et al. (2015) placed the dune formation in this area at about 8 ka, according to a single OSL age; however, no details regarding the date and sample laboratory treatment were provided.

Methodology

Ground-penetrating radar (GPR) survey

The internal structure of the Varesmetsa dune ridge was studied using a GPR device (Zond 12e, Radar Systems Inc., Latvia). A 300 MHz antenna was pulled across and along the ridge, and measurements were triggered at 0.1 m intervals by the odometer wheel. The profiles were positioned with a GPS device (usually with an accuracy of better than 10 m in forested areas) that was attached to the GPR. The profiles were corrected for topography, using the profile coordinates and LiDAR data (Estonian Land Board).

The data were processed using Prism2 software. The conversion of the time-scale to a depth-scale required information about the electromagnetic wave velocities (or relative dielectric permittivity, ε) in the soils. The velocities were deduced using a hyperbolic curve fitting technique, although the number of point sources (e.g. rocks) in these generally fine-grained sediments was low. An dielectric permittivity of ε = 8 was used for the ridge above the water table and ε = 20 for the saturated fines. These values are consistent with relatively wet conditions, such as peatlands, in the environs of Varesmetsa dune. The profiling was conducted in November.

Sampling

A total of 35 samples were collected from the cross-section of Varesmetsa dune (59°6′52.81″N, 27°23′51.25″E; Fig. 2c) for grain-size analysis, each weighing 1–1.5 kg wet. Three sediment sequences, comprising nine profiles, were sampled: the Glaciolacustrine (Profiles 1–3), Aeolian 1 (Profile 4) and Aeolian 2 (Profiles 5–9), as shown in Fig. 2 and Table 1. The Glaciolacustrine sequence represents the subhorizontally-laminated glaciolacustrine fines and sands. The Aeolian 1 sequence documents aeolian sand with low-angled inclined stratification, modified by horizontal and wavy stratification. The Aeolian 2 sequence consists of sand with high-angled inclined stratification. Samples along the profiles were collected vertically at 10–30 cm intervals (Fig. 2c).

In addition, 82 grain-size analyses were performed on Iisaku site samples (36 from Iisaku 1 and 46 from Iisaku 2; 59°1′47.21″N, 27°18′24.47″E and 59°5′23.29″N, 27°16′30.41″E, respectively; Fig. 1). Those results are presented here, together with the textural sedimentary features (Kalińska-Nartiša et al. 2015a), for regional comparison.

Micro-scale analyses

The samples for grain-size analysis were oven-dried at 105 °C, subsampled in 100–150 g aliquots, and mechanically sieved for 20 min. Logarithmic (Folk and Ward 1957) graphical measurements, such as mean, sorting (σ) and skewness were calculated using GRADISTAT software (Blott and Pye 2001). Grain-size data are presented as cumulative and bivariate plots of graphical measures, which can help in distinguishing different types of deposition (Clarke et al. 2014).

The quartz grains of the 0.5–0.8 mm and 0.8–1.0 mm sieved fractions were used for both grain roundness and grain surface (matte/shiny) analysis, which was performed under a binocular microscope. These fractions have been considered to be the most suitable for studying aeolian abrasion (Cailleux 1942; Mycielska-Dowgiałło 1993) because finer fractions may have a limited ability to record aeolian processes (Kalinska-Nartiša et al. 2017a, b; Kalińska-Nartiša and Gałka 2018). In this study, 33 and 27 samples of the 0.5–0.8 mm and 0.8–1.0 mm fractions, respectively, were analysed. From these, 120–150 quartz grains were randomly chosen at 40 × magnification. Using the classification of grain shapes and surfaces of Cailleux (1942), modified by Mycielska-Dowgiałło and Woronko (1998), six groups of grains were visually determined: (1) well rounded and matte across the whole surface; (2) partially rounded and matte only on the most convex part of the grain; (3) well rounded with a shiny surface; (4) partially rounded with a shiny surface; (5) intensively weathered by silica precipitation; and (6) broken, but with preservation of at least 30% of the original grain surface. These grain categories are representative of aspects of the sedimentary environment (for details, see Woronko et al. 2015).

A total of 34 and 27 samples from 0.5–0.8 and 0.8–1.0 mm fractions, respectively, were examined by light mineral analysis (Woronko et al. 2013). Of particular interest were quartz, feldspar and mica, due to their differential resistance to reworking/redeposition (Muhs 2004; Woronko et al. 2013). In this study, 200–220 grains from each sample were randomly selected and categorised as quartz, feldspar, crystalline rock particles and mica.

Luminescence dating

Four samples were collected for OSL dating from the aeolian sediments of Profile 4 (Aeolian 1 sequence) from depths of 2.40 m and 2.70 m, and from Profile 5 (Aeolian 2 sequence) from depths of 1.60 and 1.80 m, adjacent to where the textural samples were taken from (Table 1). In the field, 0.5-m-long opaque PVC tubes were hammered into freshly dug and cleaned surfaces of the pit. The tubes were opened in the laboratory (Silesian University of Technology, Gliwice Centre for Absolute Dating, Gliwice, Poland), and the samples were exposed to subdued orange light.

For the OSL measurements, coarse grains of quartz (90–125 μm) were used. Extraction of these from the sediment samples involved treatment with 20% hydrochloric acid and 20% hydrogen peroxide The samples were then wet-sieved and the quartz was obtained using sodium polytungstate solutions to concentrate grains with densities in the range of 2.62–2.75 g/cm3. Etching in concentrated hydrofluoric acid for 60 min was performed to clean the outer surfaces of the grains and to remove the contribution of external alpha radiation and possible contamination from feldspar. The beta-dose attenuation was calculated using Mejdahl (1979).

To estimate the annual dose, high-resolution gamma-ray spectrometry, using a Canberra HPGe detector, was applied. On arrival in the laboratory, the natural water content in the samples was measured, and they were then dried. The samples were stored for 3 weeks prior to measurement to ensure equilibrium between the gaseous 222Rn and 226Ra in the 238U decay chain. Each measurement lasted for at least 24 h. The activities of the isotopes present in the sediment were determined using the International Atomic Energy Agency (IAEA) standards RGU, RGTh, RGK after subtraction of the detector background. The Adamiec and Aitken (1998) conversion factors were applied to calculate the dose rates. Estimates of the cosmic-ray dose rate were determined using Prescott and Stephan (1982). We assumed an average water content of 10 ± 5%. The obtained dose rates are given in Table 2.
Table 2

Summary of radionuclide concentrations, dose rates (Dr), measured water content, equivalent doses (De), overdispersion and ages: s.e. = standard error

Field ID

Laboratory ID (Gliwice/Risø)

Radionuclide concentration ± SE

Dose rate ± SE (Gy/ka)

Measured water content (%) ± 5%

Equivalent dose (Gy)

Over-dispersion (%)

Age (ka)

232Th (Bq/kg)

238U (Bq/kg)

40K (Bq/kg)

α-Dose rate

β-Dose rate

γ-Dose rate

Cosmic dose rate

Total dose rate (Dr)

    

Varesmetsa 1.6

GdTL-1585

9.45 ± 0.22

8.68 ± 0.15

341 ± 8.9

0.0202 ± 0.0039

0.804 ± 0.045

0.385 ± 0.012

0.175 ± 0.018

1.386 ± 0.049

2.9

18.52 ± 0.85

15

12.3 ± 0.7

Varesmetsa 1.8

GdTL-1586

18.10 ± 0.47

14.73 ± 0.29

338 ± 9.6

0.0401 ± 0.0071

0.89 ± 0.046

0.514 ± 0.014

0.169 ± 0.017

1.612 ± 0.051

4.9

19.68 ± 0.98

16

11.3 ± 0.7

Varesmetsa 2.4

GdTL-1587

11.91 ± 0.34

10.27 ± 0.21

368 ± 10

0.0127 ± 0.0023

0.86 ± 0.048

0.439 ± 0.013

0.156 ± 0.016

1.470 ± 0.052

3.9

21.5 ± 1.5

25

13.5 ± 1.1

Varesmetsa 2.7

GdTL-1588

19.66 ± 0.37

15.50 ± 0.21

454 ± 12

0.0430 ± 0.0077

1.14 ± 0.060

0.612 ± 0.017

0.151 ± 0.015

1.940 ± 0.015

7.0

23.5 ± 1.0

13

11.1 ± 0.6

To obtain the values of the equivalent dose (De), we applied a single-aliquot regenerative (SAR) dose procedure (Murray and Wintle 2000). The pre-heating used was 260 °C for 10 s for the OSL measurements, and a 220 °C cut-heat for the sensitivity measurements. The measurements were performed using a Daybreak 2200 TL/OSL Bortolot 2000 reader, fitted with a calibrated beta-radiation source. The reader used blue diodes (470 ± 4 nm) that delivered stimulating light of ca. 60 mW/cm2 intensity to the sample and a 6 mm Hoya U-340 filter was used for OSL detection. Initial test measurements were carried out on three aliquots to obtain starting De estimates. For the actual measurements, three regenerative dose points were selected that bracketed the expected De. In the SAR protocol, a zero-dose point and a repeat point were included. The data were fitted using a single saturating exponential, and the natural De was obtained by interpolation of the natural signal.

To calculate the final Des, the Central Age Model (CAM; Galbraith et al. 1999) was used for 16 (Sample GdTL-1585) and 15 (the rest of the samples) aliquots. The overdispersion is given in Table 2.

Results

Dune architecture

Based on their reflection patterns, all three sediment sequences could be distinguished from their GPR profiles (Fig. 3). The Glaciolacustrine sequence is characterised by sets of parallel reflectors, indicating well-preserved layer thickness, representing a calm water regime (deeper waters). The reflectors undulates slightly where the layering likely followed the previous lakebed topography. The Aeolian 1 sequence also shows generally subhorizontal layering, but the reflectors had a wavy texture. Apparently, the Aeolian 1 pattern continues beyond the ridge, as a near-surface layer. This might suggest that a subsoil layer was reworked by wind. The Aeolian 2 sequence has a reflection pattern that is typical of dunes (Ludwig et al. 2017), with relatively weak reflectors being tilted in a downwind (eastward) direction. The transition from Aeolian 1 to Aeolian 2 is gradual in the top part of the dune, while the flat reflectors of Aeolian 1 continue as tilted the reflectors of Aeolian 2 on the eastern slope.
Fig. 3

GPR cross section of the Varesmetsa dune and its interpretation (inset)

Grain size

The Glaciolacustrine sequence at Varesmetsa consist of coarse silts, very fine to fine sands, with a mean grain size of between 5.1 and 2.8 phi. The sediments are poorly to moderately well sorted, with generally positive value of skewness.

The Aeolian 1 sequence is represented by entirely fine-grained, moderately- or poorly-sorted sand. The mean grain size varies between 2.2 and 2.9 phi, and the standard deviation ranged from 0.6 to 1.1 phi. The skewness values are between − 0.1 and 0.1.

The Aeolian 2 sequence consists of fine-, occasionally moderately-, grained sand (mean 1.9–2.9 phi), with a standard deviation of between 0.5 and 1.0 phi and a skewness between − 0.2 and 0.2.

Iisaku 1 (Fig. 1) consists entirely of fine sand (mean 2.2–2.7 phi), with a standard deviation between 0.5 and 0.7 phi, and skewness values between − 0.1 and 0.2. At Iisaku 2, the sediments are represented by fine- and medium-grained sand (mean 1.9–2.7 phi), which is moderately sorted (σ = 0.5–0.9 phi), with skewness values from − 0.2 to 0.1.

The cumulative curves of all the investigated sediments appear visually similar, especially among the Aeolian 1 of Varesmetsa and the Iisaku sites (Fig. 4a). The curves representing the grain-size distributions in the Glaciolacustrine and Aeolian 2 sequences are more diverse, which is due to poorer sediment sorting. A similar trend is observed from the standard deviation–mean biplot, where the Glaciolacustrine samples are slightly shifted towards poorer sorting.
Fig. 4

Selected results of micro-scale sediment study along within the data from various parts of the ESB: a grain-size cumulative curves [data from southern France: Bertran et al. (2011)]; data from southern Poland and Latvia: unpublished data; Kalińska-Nartiša); b mean-sorting-skewness bi-plots (data from Central Poland: Kalińska 2012); c aeolian/weathered quartz grains bi-plot (data from Central Poland: Kalińska 2012)

Character of quartz grains

Quartz grains with matte surfaces are significant constituents of all the investigated samples and fractions (Fig. 5a). Partially-rounded matte grains make up as much as 41–64%, 43–68% and 49–67% in the 0.5–0.8 mm fraction of the Glaciolacustrine, Aeolian 1 and Aeolian 2 sequences, respectively. The content of well-rounded grains with matte surfaces is as high as 33% (e.g. in the Glaciolacustrine sequence), whilst being notably less in the 0.8–1.0 mm fraction of the investigated sediments. At the same time, the 0.8–1.0 mm fraction contains up to 72% of the partially-rounded matte grains.
Fig. 5

a Types of quartz grains and light mineral composition of 0.5–0.8 and 0.8–1.0 mm fractions; b luminescence age inversion as seen in two sediment profiles

The content of intensively-precipitated grains varies between 11 and 32% (in the Aeolian 1 and Glaciolacustrine sequences, respectively), and does not change significantly in the 0.8–1.0 mm fraction (between 10 and 38%). Broken and partially-rounded grains with shiny surfaces are virtually absent from the investigated samples.

Mineral composition

Among the light minerals in the Varesmetsa sediments, quartz is the most common, with its content varying between 74 and 91% in the 0.5–0.8 mm fraction (Fig. 5a). Apparently, the quartz content slightly diminishes to 56–90% in the 0.8–1.0 mm fraction. A few mica-rich horizons (85% and 37% in the 0.5–0.8 mm fraction) occur in Profiles 3 and 4 of the Glaciolacustrine and Aeolian 1 sequences, respectively. The platy mineral content in the 0.8–1.0 mm fraction is low, occasionally being 11–18% (Profile 3). The share of feldspar and crystalline rock particles varies from 5–15 to 1–11%, respectively (0.5–0.8 mm fraction), and is only slightly higher in the 0.8–1.0 mm fraction.

Luminescence ages

The present-day water content in the sampled aeolian sediments varies between 2.9 ± 5 and 7.0 ± 5% (Table 2). The total dose rates are between 1.4 and 1.9 Gy/ka. Considering similar hydrogeological conditions for all the Varesmetsa and Iisaku samples, a lifetime average burial water content of 10 ± 4% is used. This is similar to the value reported previously from the nearby Iisaku dunes (Kalińska-Nartiša et al. 2015b). The total dose rates are between 1.4 and 1.9 Gy/ka. The determined De values range from 18.6 to 23.5 Gy, with a corresponding age range of between 11.1 and 13.5 ka. The De distributions are presented in Supplementary Figure S1. Nevertheless, there is a slight apparent inversion of the ages obtained from both profiles (Fig. 5b). The youngest age of 11.1 ± 0.6 ka occurs in the lowermost part of Profile 4 and is vertically inconsistent with a 30-cm higher age of 13.5 ± 1.1 ka in the same profile. These ages correspond to within 2σ of each other, while the two ages from Profile 5, showing a similar inversion, correspond within 1σ.

Discussion

Through macro- and micro-scale sediment studies and a chronological analysis, we have improved our understanding of the past processes involved in the glaciolacustrine deposits and their later aeolian mobilisation. The proxies provided here allow a better understanding of the depositional processes, their timing and the relationships among them. These results are discussed below.

A slight luminescence age inversion is identified in this study. One cause of this may have been a problem with the luminescence signal and estimating the samples’ environmental dose rates (Rawling et al. 2008; Madsen and Murray 2009) or water contents, postsedimentary bioturbation (Lu et al. 2006), the specific geological situation (Houmark-Nielsen 2008) or a switch in sediment sources (Alexanderson and Murray 2007). In this study, during the macro-scale field observations, no potentially complicated sedimentary structures or bioturbation were found. In addition, the reflection patterns of GPR profiles did not suggest extensive hiatuses in deposition or any footprints of erosional events. However, the environmental dose rate differed by about 25%, between 2.4 and 2.7 (Table 2) at Varesmetsa, and a cause of this might be a change in sediment source. However, there is no sedimentological evidence to support this, since both the sedimentary structures and textural sediment features did not differ significantly. As far as the ages in the two profiles from Varesmetsa go, they corresponded within 1–2σ, and are considered to be identical.

Past sedimentary processes at Varesmetsa

Sedimentary structures, supported by the GPR images, are the basis for distinguishing among the lithological units at Varesmetsa. Applying this proxy, the subhorizontal, horizontal and wavy stratification of the fines and sand representing the Glaciolacustrine sequence are interpreted as being due to near-standing/low-energy water conditions (cf. Salamon and Zieliński 2010), modified by occasional flows in a shallow glacial lake (cf. Ojala et al. 2000). Wet conditions support well-preserved mica horizons. The platy nature of mica requires slow-changing depositional conditions to allow it to settle (Pisarska-Jamroży et al. 2015), requiring 30–50% more time than spherical grains for its deposition (Komar 1989). A water-table-controlled environment, as represented by the Glaciolacustrine sequence and occasionally by the Aeolian 1 sequence (see below), provides the ideal conditions for mica-like minerals settling from suspension in standing water (Marcinkowski and Mycielska-Dowgiałło 2013; Vandenberghe et al. 2013). The continuous nature of the sand layers in the Aeolian 1 sequence (Fig. 3), with occasional mica-rich layers (Fig. 5), indicates deposition in a sediment-rich environment, such as the wind erosion of a former lakebed (represented by the Glaciolacustrine sequence). The Aeolian 2 sequence is determined to be a continuation of the Aeolian 1 sequence, with a few significant differences, such as a lack of sedimentation on the stoss (windward) slope and an almost complete absence of micas. Most likely, the Aeolian 2 sequence was formed by redeposition of the stoss slope sediments on the lee slope. This would indicate formation under sediment-deprived conditions, most likely the development of vegetation over the former lakebed depriving the dune of fresh incoming sediments, especially of easily-removable mica (cf. Anderson et al. 2017).

Certain results obtained from the micro-scale study argued for the Glaciolacustrine and Aeolian environments to be closely related, meaning that the aeolian action was limited. Brief aeolian reworking can be seen, for example, through grain-size analysis and the type of quartz grains. The granulometric properties of the investigated sediments appears to be largely similar, not only among the sequences, but also in a regional comparison with the dune sediments of the Iisaku sites, and with other parts of the ESB, such as the dunes in northern Latvia and the coversands in southern Poland and France (Fig. 4a, b). Only sediment sorting and skewness can help to differentiate among these regional Glaciolacustrine and Aeolian sequences (Fig. 4b).

Usually, a glaciolacustrine sedimentary environment exhibits either a mixture of quartz grain shapes (Narayana et al. 2010) or angularity, abrasion and a high frequency of fracturing (Mahaney et al. 2004, 2014), but such grains are almost absent from this study’s Glaciolacustrine sequence. Instead, grains with signs of aeolian action on their convex parts (partially rounded, matte) dominate. Aeolian grains from the Glaciolacustrine sequence are expected because a relatively large input of aeolian-type quartz grains had already been observed in: (1) the lowermost portion of the glaciolacustrine deposits of the nearby Iisaku sites (Kalińska-Nartiša et al. 2015a); (2) the glaciofluvial material of the adjacent Iisaku-Illuka esker, which served as a potential source (Kalińska-Nartiša, unpublished data); and, finally, (3) the pre-Quaternary formations in Estonia that possess aeolian grains (Kleesment 2009). In addition, a prevalence of aeolian quartz grains has previously been noted in sediments from various palaeoenvironments, such as fluvial, fluvioperiglacial and aeolian, in Poland (Woronko et al. 2015; Zieliński et al. 2015) and in Western Europe (Vandenberghe et al. 2013; Sitzia et al. 2015). Following all these pieces of evidence, the material of aeolian origin is believed to be allochtonic in the Varesmetsa Glaciolacustrine sequence, delivered to the glacial lake as the result of aeolian activity that spanned either a short time or short distance (cf. Woronko et al. 2015). The Glaciolacustrine sequence, therefore, represents cold and dry climatic conditions in the foreland of the Pandivere-Neva marginal zone, where the glacial lake existed.

Neither the Aeolian 1 or Aeolian 2 sequences differ significantly from the Glaciolacustrine sequence, in terms of quartz grain characteristics, with grains of different shapes possessing matte surface dominating. However, the numbers of such characteristic grains are much lower than in, for example, the central part of the ESB (Woronko et al. 2015), where aeolian activity was more intense (Zieliński et al. 2016a). More well-rounded grains occur in the sediments of the Aeolian 1 sequence in the 0.8–1.0 mm fraction, and in Aeolian 2 sequence compared with the Aeolian 1 sequence. This could be explained by the fact that (1) the sediments of the Aeolian 1 sequence were the source of the Aeolian 2 sequence sediments, and/or (2) a generally stronger aeolian abrasion is observed in this fraction size (Dzierwa and Mycielska-Dowgiałło 2003; Kotilainen 2004). Following the above-mentioned similarities, and concerning the intensity of the aeolian processes, contrary to the central part of the ESB, these grains experienced only slight aeolian transformation, and so the source of the material was likely entirely a local aquaeoglacial deposit.

Aeolian chronology at Varesmetsa and its context

Our luminescence ages ranged from 13.5 ± 1.1 to 11.1 ± 0.6 ka at Varesmetsa, which argues for continuous aeolian deposition (Fig. 5b). The oldest age obtained in this study slightly postdates the Pandivere Stadial, which lasted from 14,000 to 13,800 cal year BP, according to the latest study by Amon et al. (2016). The Varesmetsa site is located in the ice-free area between the Last Glacial Maximum and the local Baltic Ice Lake coastline at this time (Lasberg and Kalm 2013), on an island, which existed there during the Baltic Ice Lake A2 stage at ca. 13,300 cal year BP (Vassiljev and Saarse 2013). Modelling results have shown that the A2 water-level was lowered by ca. 15 m at this time, being as high as ca. 48–50 m above the present-day sea level (Fig. 6; Rosentau et al. 2004; Vassiljev and Saarse 2013). Considering possible past water-level fluctuations, which in this flat, sandy terrain likely induced high-amplitude shoreline displacement, the conditions were favourable for periodic aeolian action, leading to dune formation with a foot altitude at ca. 45–50 m (Fig. 6). The low altitudes of these coastal dunes are also reflected in the dune morphology, as all individual dunes in the area are parabolic, with horns standing against the prevailing wind, indicating the presence of a moist bed. Combining these facts with the deglaciation scheme of Estonia, in which the ice sheet still covered part of NW Estonia, katabatic winds would have been induced towards the periglacial area, resulting in aeolian deposition onto dry land north of the regressive Glacial Lake Peipsi. Following our OSL ages, the aeolian deposition started at ca. 13.5–13.3 ka in NE Estonia (and up to ca. 14.5 ka BP, if considering the error bars; see Fig. 6). Following lake-level reconstruction, the ca. 13.5-ka water-level still seems to be higher than the dominating dune foot altitude (Fig. 6); however, the presented reconstruction is only tentative, and likely water-level fluctuations should be considered. Aeolian activity was favoured by (1) a winter mean temperature of ca. – 14 °C and a summer temperature of between ca. 10 and 13 °C, according to pollen-based reconstructions (Veski et al. 2015); (2) a presumable lack of trees for the entire Late Glacial period in northern Estonia, and the occurrence of sparse pioneering vegetation, such as treeless tundra (Amon et al. 2014); and (3) a likely lower than modern annual precipitation, enhancing continental conditions compared to the present-day climate (cf. Feurdean et al. 2014).
Fig. 6

a Tentative minimum groundwater-level in the study area as derived from the modelled water-level changes of Glacial Lake Peipsi (Rosentau et al. 2004; Vassiljev and Saarse 2013) with the indication of dune foot altitude, periods of aeolian activity derived from luminescence ages. b NGRIP d18O (‰) data (Rasmussen et al. 2006)

A single luminescence age of 12.4 ± 0.7 ka at Varesmetsa is likely related to a considerable ground-water-level drop in the region, which took place between 13,300 and 12,200 cal year BP (Vassiljev and Saarse 2013), thus giving a time window for dune deposition (Fig. 6). Assuming also a general temperature and precipitation drop (Rasmussen et al. 2006; Feurdean et al. 2014; Veski et al. 2015), along with an occurrence of herb-dwarf-dominated shrubs in the region (Amon et al. 2012), loose material may easily have been mobilised by wind and deposited on the leeward slopes of the migrating dunes, as recorded at Varesmetsa (Fig. 6). Aeolian activity at Varesmetsa terminated between 11.3 ± 0.7 and 11.1 ± 0.6 ka, which represents a similar time frame to that at Iisaku (Kalińska-Nartiša et al. 2015a). Later aeolian activity was hampered because paludification started at ca. 10 ka in the region (Fig. 6; Hiiemaa et al. 2014).

Aeolian events in the eastern Baltic region and in Western Europe

The OSL ages obtained in our study are largely consistent with those of previous studies in the region of the Baltic States. For example, the OSL age of ca. 13.5 ka from Varesmetsa corresponds well with similar aeolian deposition in eastern Latvia and Lithuania (Table 2), and likely reflects the colder GI-1b episode in the North Greenland Ice Core Project (NGRIP) event stratigraphy (Fig. 6; Rasmussen et al. 2006). Accumulation of the so-called Younger Coversand II took place in Western Europe in a similar time frame (Vandenberghe et al. 2013). Sand mobilisation at ca. 12.4 ka, as recorded in this study, correlates well with dune migration in southern Estonia (Kalińska-Nartiša et al. 2016), which is further consistent with the cold GS-1 Greenland Event (Fig. 6; Steffensen et al. 2008). Previous studies, as well as this research, have demonstrated that the time span for aeolian sediment mobilisation seems to have been extended in this part of the ESB, contrary to in its western and central parts in the rest of Europe, where periods of aeolian mobility alternated with palaeosol development (Bertran et al. 2011; Tolksdorf et al. 2013; Vandenberghe et al. 2013; Küster et al. 2014; Beerten and Leterme 2015; Zieliński et al. 2015, 2016a, b; Hirsch et al. 2017). In the Baltic region, so far, no buried soils have been found among the aeolian sediments of the NE ESB, except for discontinuous, lens-like and diffuse darkish organic material in eastern Latvia (Kalińska-Nartiša et al. 2016; Kalińska 2019). At Iisaku, four phases of aeolian activity have been documented; however, the luminescence ages represent more of a continuous time span between ca. 13.3 and 10.5 ka (Kalinska-Nartiša et al. 2015a, b), rather than well-expressed events. A record of such stability, apparent from palaeosols, for instance, is practically absent. This indicates harsh climatic conditions, favouring sparse pioneering vegetation that was incapable of seriously hampering aeolian activity. Because the study area was located on an island in the regressive Glacial Lake Peipsi, this might also have slowed down the formation of a dense vegetation cover, compared to the neighbouring upland area. On the other hand, the palaeosol record may have been erased by constantly changing water levels in the glacial lake, where, due to wave action, the development of pioneering vegetation and soil was hampered.

It has been assumed that aeolian activity reflects the progress of a deglaciation (Zeeberg 1998). Following this assumption, aeolian activity would have started earlier in Lithuania than in Estonia. Unfortunately, our chronological data, together with earlier age determinations of aeolian sands from the Baltic States, do not support this assumption. Thus, the earliest aeolian activity in central Lithuania (ca. 16 ka) and southern Latvia (ca. 15 ka) predate, by ca. 2 and 1 ka, respectively, the earliest wind activity in southern Lithuania (ca. 14 ka; Table 2; Kalińska-Nartiša et al. 2015b). The following pulse of wind events at around 13–13.5 ka was synchronous in northern Lithuania, eastern Latvia and northern Estonia. Between ca. 12 and 11 ka, both the northern and southern Estonian dunes were formed, together with the dunes in southern Lithuania (Molodkov and Bitinas 2006). The remaining ages show aeolian deposition at around 9 ka in eastern Latvia, which continued later into the Holocene, as reflected in the Lithuanian localities (Molodkov and Bitinas 2006). In summary, we did not see the expected chronological order, from south to north, as proposed by Zeeberg (1998), which might be due to either local conditions, such as suitable source sediments, the evolution of meltwater basins, the occurrence of pioneering vegetation or too few age determinations.

Conclusions

In the foreland of the Late Weichselian Pandivere-Neva marginal zone in NE Estonia, wind action resulted in significant aeolian landforms, with clear aeolian sediment architecture. However, micro-scale sediment properties, such as grain-size, the shape and character of quartz grain surfaces, and overall mineral compositions of the Varesmetsa dune, argue for short-distance sediment transport during a brief aeolian event, where sediment recycling is practically undetectable.

The luminescence ages showed that dune development took place between 13.5 ± 1.1 and 11.1 ± 0.6 ka. However, it was largely controlled by changes in the water level of the Glacial Lake Peipsi. Aeolian deposition started at 13.5–13.3 ka in NE Estonia, when the lake was at a stand of 48–50 m a.s.l., and dry land existed directly in front of the glacier. This deposition took place during the colder GI-1b episode and correlates with the Younger Coversand II succession known from Western Europe.

Later, deposition was possible due to a considerable water-level drop and a decrease in precipitation during the GS-1 cooling. Drier conditions made sediment easier to mobilise, which resulted in deposition on the leeward slopes of the migrating dunes. Aeolian activity continued up to 11.3–11.1 ka, and even to 10.5 ka at the neighbouring Iisaku site, and ended when paludification started in the region.

Notes

Acknowledgements

Dr. Tony Reimann (Wageningen University) and unknown reviewer are thanked for reviews that improved this manuscript. This research was supported by the Postdoctoral Research Grant ERMOS (FP7 Marie Curie Co-fund the ‘People programme’), ‘Age and climatic signature of coversands deposits distributed on glaciolacustrine basins along the Scandinavian Ice Sheet margin southeast of the Baltic Sea’.

Supplementary material

531_2019_1746_MOESM1_ESM.docx (53 kb)
Supplementary Figure S1. Equivalent dose (De) distributions of aeolian samples from the Varesmetsa site. (DOCX 53 kb)
531_2019_1746_MOESM2_ESM.docx (13 kb)
Supplementary material 2 (DOCX 12 kb)

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Authors and Affiliations

  1. 1.Faculty of Earth SciencesNicolaus Copernicus UniversityToruńPoland
  2. 2.Institute of Ecology and Earth SciencesUniversity of TartuTartuEstonia
  3. 3.Department of GeologyEstonian Museum of Natural HistoryTallinnEstonia
  4. 4.Faculty of Geography and Earth SciencesUniversity of LatviaRigaLatvia
  5. 5.Division of Radioisotopes, Institute of Physics-Centre for Science and EducationSilesian University of TechnologyGliwicePoland

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