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Tytuł:
New luminescence ages reveal Early to Middle Weichselian deposits in central Latvia
Autorzy:
Lamsters, K.
Kalińska-Nartiša, E.
Zelčs, V.
Alexanderson, H.
Powiązania:
https://bibliotekanauki.pl/articles/2060383.pdf
Data publikacji:
2017
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
optically stimulated luminescence (OSL) dating
subglacial bedforms
Early Weichselian
Middle Weichselian
central Latvia
Opis:
New optically stimulated luminescence (OSL) ages show that sandy deposits overlain by Late Weichselian subglacial till in central Latvia are of Early to Middle Weichselian age. The finer chronological resolution of unconsolidated sediment deposition in the Central Latvian Lowland (CLL) remains relatively unstudied, and here we provide a first characterisation of the deposits with respect to their age. Three OSL ages ranging between 84 ± 9 ka and 112 ± 11 ka suggest that the deposits studied in the CLL are of Early Weichselian age (MIS 5). We found no Middle Weichselian deposits in the CLL, and assume that any such younger sediments might have been eroded during the advance of the Zemgale Lobe in the Late Weichselian. One site, in the ice-marginal zone adjacent to the interlobate area, has nevertheless deposits dated to 44 ± 10 ka corresponding to the Middle Weichselian (MIS 3). Our results are compatible with existing ESR ages on three sets of Portlandia arctica shells from the central part of the lowland; the shells had been incorporated into glacial deposits during later glacial advances. Finally, our findings largely support ice-free conditions during the Early and Middle Weichselian in the middle and southern part of central Latvia.
Źródło:
Geological Quarterly; 2017, 61, 2; 480--490
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Palaeoglaciology of the Weichselian Odra ice lobe, NE Germany and NW Poland
Autorzy:
Hermanowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/295026.pdf
Data publikacji:
2010
Wydawca:
Stowarzyszenie Geomorfologów Polskich
Tematy:
subglacial drainage
subglacial landforms
Odra lobe
Weichselian glaciation
ice movement dynamics
Opis:
Southern part of the Scandinavian Ice Sheet terminated in large lobes projecting tens of kilometres beyond the main ice sheet margin. One of the main ice lobe was the Odra lobe localized in NE Germany and NW Poland. In this study concise description of current morphology of the Odra lobe area is given with special reference to subglacial hydraulic conditions during the ice sheet advance. Subglacial conditions were simulated by using time-dependant three-dimensional numerical model, and obtained results were compared to geological observations. The results show entire groundwater system alternation that affected the ice/bed coupling and influenced formation of specific subglacial landforms. Coupling the simulation results with empirical estimates of basal melting rate suggests that only a small fraction of basal meltwater could have drained to the ice forefield as groundwater. Adverse slope of the low-permeable ice bed hampered water drainage, and led to water accumulation at the ice/bed interface that in turn facilitated basal sliding and bed deformation.
Źródło:
Landform Analysis; 2010, 14; 12-24
1429-799X
Pojawia się w:
Landform Analysis
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Vegetation and climate changes at the eemian/weichselian transition : new palynological data from central Russian plain
Autorzy:
Borisova, O. K.
Powiązania:
https://bibliotekanauki.pl/articles/1186124.pdf
Data publikacji:
2005
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
palynology
Eemian/Weichselian transition
Central Russian Plain
Opis:
Palynological analysis of core Butovka obtained from the Protva River basin 80 km south-west of Moscow (55 stopni10'N, 36 stopni 25'E) provides a record of vegetation and climate change in the central Russian Plain spanning the Last Interglacial and the beginning of the following glacial epoch. Pollen profiles of the Mikulino (Eemian) Interglaciation in the Central Russian Plain show a distinctive pattern of the vegetation changes, reflecting an increase in temperatures towards the optimum phase of the interglaciation followed by a gradual cooling. Rapid climatic deterioration, manifesting an onset of the Valdai (Weichselian) Glaciation, took place after a slower cooling accompanied by increasing humidity of climate during the post-optimum part of the Mikulino Interglaciation. The interglacial/glacial transition had a complex structure, being marked by a sequence of secondary climatic oscillations of varying magnitude. A decreasing role of mesophilic plants and an increase in abundance and diversity of the xerophytes and plants growing at present in the regions with highly continental climate in the Butovka pollen record suggests that during the Early Valdai the climate grew both more continental and arid. With this tendency at the background, two intervals of climatic amelioration can be distinguished. Both of them are marked by the development of the open forest communities similar to the contemporary northern taiga of West Siberia. The latter of the two warm intervals had a larger magnitude of temperature changes than the first one, as indicated by a greater landscape role of dark-coniferous trees (Picea + Abies + Pinus sibirica). Based on its stratigraphic position and inferred features of climate and vegetation, the latter of the two warm intervals identified in the Butovka pollen profile can be correlated with the Upper Volga Interstade in the Russian Plain, or the Brőrup Interstade in West Europe. We can also tentatively correlate it with warm DO event 23 as reflected in the oxygen isotope record from the Northern Greenland deep ice-core (North GRIP Members, 2004). A slighter and shorter warming within the first cold stage of the Early Valdai probably had an interphasial rank and corresponded to a shorter DO event 24 in the NorthGRIP oxygen-isotope curve.
Źródło:
Polish Geological Institute Special Papers; 2005, 16; 9--17
1507-9791
Pojawia się w:
Polish Geological Institute Special Papers
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Lithology and palaeomagnetic record of Late Weichselian varved clays from NW Russia
Autorzy:
Bakhmutov, V.
Kolka, V.
Yevzerov, V.
Powiązania:
https://bibliotekanauki.pl/articles/2059241.pdf
Data publikacji:
2006
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Kola Peninsula
Late Weichselian
varved clays
magnetic parameters
palaeomagnetism
Opis:
A lithological and palaeomagnetic analysis of Late Weichselian glaciolacustrine deposits from two ancient periglacial lakes was carried out in the valley of the Shuja (S Karelia) and Ust-Pjalka (S-E Kola Peninsula) rivers, NW Russia. The rhythmic structure of the varved clays is interpreted as turbiditic with systematic differences between the proximal and distal areas of accumulation. In the proximal area the textural and structural properties of the deposits towards both distal and (partly) lateral directions are described. It is shown that the proximal varve successions are incomplete while distally they are continuous. The accumulation of one varve (DE rhythm, second order cycle) during one year is consistent with palaeomagnetic data. Significant differences in magnetic parameters and in the palaeomagnetic "records" of declination-inclination between proximal and distal varves are established. Analysis of palaeomagnetic properties was combined with lithological analysis in all sections. Locally, the varved clays in the proximal area could be used for palaeomagnetic research. Taking into account the erosion of underlying deposits by turbidity currents and inclination shallowing, these sediments could not precisely record palaeosecular variation (PSV). The distal varved clays (represented by the DE rhythms) are clearly most useful both for varve-clay chronology and PSV recovery. The palaeomagnetic declination and inclination records are correlated with chrono- and magnetostratigraphy scheme of NW Russia. This paper also examines lithology-dependent "inclination error" and anisotropy of magnetic susceptibility in glaciolacustrine sediments.
Źródło:
Geological Quarterly; 2006, 50, 3; 353-368
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The development of periglacial sedimentation in the Wolica Valley (SE Poland) during the Weichselian Upper Pleniglacial
Autorzy:
Superson, J.
Zagórski, P.
Powiązania:
https://bibliotekanauki.pl/articles/294434.pdf
Data publikacji:
2003
Wydawca:
Stowarzyszenie Geomorfologów Polskich
Tematy:
periglacial sedimentation
Lublin Upland
terrace deposits
Weichselian Upper Pleniglacial
Opis:
The development of the Weichselian Upper Pleniglacial periglacial sedimentation in the Wolica Valley was evaluated by means of geomorphological, geological and sedimentological investigation. Sediments of the medium (II) raised terrace, the surface area of which is a dominant element of the valley, were examined. The terrace has a complex structure comprising deposits of different age, lithology and origin. The basal part of the terrace is formed from terrace remnants from the Middle Pleniglacial and the phase before maximum cold of the Upper Pleniglacial. The base consists of sandy channel deposits and silty-sandy floodplain deposits. The upper part of the terrace is a thick series of deposits from the phase after maximum cold. It is built from slope, floodplain and channel deposits, as well as alluvial fans. The complexity of the structure results from the specific character of periglacial processes and their rhythmical course, as well as from the influence of local conditions. The deposits of the basal part of the terrace were shaped in a subpolar climate with maritime features, whereas the sediments of its upper part formed in continental subpolar climate. Local factors, such as: lithology of rocks in the river drainage basin, a dense network of valleys in the basin and alluvial fans, determined the suspension type of transport, the shape of the river channel and retention of a large amount of sediment in the Wolica drainage basin and on its valley-floor.
Źródło:
Landform Analysis; 2003, 4; 17-37
1429-799X
Pojawia się w:
Landform Analysis
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evolution of the Toruń Basin in the Late Weichselian
Autorzy:
Weckwerth, P.
Powiązania:
https://bibliotekanauki.pl/articles/295066.pdf
Data publikacji:
2010
Wydawca:
Stowarzyszenie Geomorfologów Polskich
Opis:
The Toruń Basin is the eastern fragment of the Noteć-Warta ice-marginal streamway. Genesis of the Toruń Basin firstly demonstrates processes of erosion and accumulation of meltwaters and the Vistula waters which occur on the background of changes in the height of erosion base and tectonic movements. In the formation of the Toruń Basin one cannot exclude its older, glacial and interglacial assumptions either, as through its location the form is related to the course of the fossil valleys. The article presents functional stages and reorganizational mechanisms of water discharge directions in the Toruń Basin, stimulated by the tectonic activity of the older bed. In the Toruń Basin the following terrace sets can be distinguished: a) the outwash levels formed not so far away from the ice-sheet front, i.e. during the Wąbrzeźno Subphase, b) the distal sections of the outwash (XI, X), c) the Vistula ice-marginal streamway terraces (the transitional terrace and IX), d) the Vistula ice-marginal streamway terraces (VIII-VI) from the period of this river bifurcation at Fordon, and e) lower terraces of the Vistula valley. In the upper part of the Late Weichselian waters formed a system of sandbed braided rivers with changeable flow regime, which initially had higher energy, then reduced energy and high again. This resulted from the ice-sheet front retreat, intensity of its ablation and the inflow of the Vistula waters from the south.
Źródło:
Landform Analysis; 2010, 14; 57-84
1429-799X
Pojawia się w:
Landform Analysis
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rate of loess accumulation in Europe in the Late Weichselian (Late Vistulian)
Autorzy:
Fedorowicz, S.
Łanczont, M.
Powiązania:
https://bibliotekanauki.pl/articles/2059500.pdf
Data publikacji:
2007
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
European loess
Upper Weichselian
mass accumulation rates (MAR)
TL age
optically stimulated luminescence (OSL)
Opis:
The European loess profiles provides evidence of changes in climate in the last glacial cycle. The final stage of loess accumulation took place in the youngest part of the last glacial (28 to 12 ka BP). Loess accumulated in two periods: from 28 to 18 ka BP and from 18 to 13 ka BP. These two stages were separated by a short phase of weaker aeolian activity and weak pedogenesis (initial tundra gleyed soils). The loess sedimentation rate can be defined as a mass accumulation rate (MAR ex pressed in g/m2/year). This value was calculated by Frechen et al. (2003) for several dozen loess sites across western and central Europe. In this paper we calculate the MAR for several loess sites in Poland and Ukraine. The MAR distribution across Poland and Ukraine is uneven in these two intervals. The MAR values oscillate between 100 to several thou sand g/m2/year. They markedly in crease eastwards, which may be explained by the latitudinal gradient of periglacial climate in the LateWeichselian (= Late Vistulian). The MAR distribution along a N-S trend confirms its large range in western and central Europe. However, the most easterly profiles (Polish and Ukrainian ones) show less variable thick nesses as the MAR was stable at a relatively low level from several hundred to more than a thou sand g/m2/year. This stability of the MAR characterized both loess-forming intervals in this part of Europe.
Źródło:
Geological Quarterly; 2007, 51, 2; 193-202
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Malacological characteristic of the Weichselian Upper Pleniglacial (MIS-2) loess profile in Tłumaczów (SW Poland)
Autorzy:
Alexandrowicz, W. P.
Ciszek, D.
Gołas-Siarzewska, M.
Powiązania:
https://bibliotekanauki.pl/articles/2060552.pdf
Data publikacji:
2013
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
loess
malacofauna
Weichselian Upper Pleniglacial
Sudetes
southern Poland
Opis:
The profile of silty sediments in Tłumaczów was the subject of detailed lithological and malacological analyses. Abundant malacofauna represented by typical loess species were found in the sediments. The variability of the species composition and ecological structure of faunal assemblages provided the basis for the reconstruction of the sedimentary environment and characteristics of the climatic conditions that prevailed during the deposition of the sediments. The results of analyses indicate that the described sediments belong to the youngest loess series related to the Weichselian Upper Pleniglacial (MIS-2). The sequence of molluscan assemblages shows considerable similarities to the described faunas found in numerous loess profiles in southern Poland. It differs substantially from the malacological sequences recognized in loess profiles in Western and Southern Europe. This proves the significant and climate-determined diversification of malacocoenoses during the Weichselian Upper Pleniglacial (MIS-2) in Europe.
Źródło:
Geological Quarterly; 2013, 57, 3; 433--442
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Eemian–Weichselian Pleniglacial fluvial deposits in S Poland (an example of the Vistula River valley in Kraków)
Autorzy:
Sokołowski, T.
Wacnik, A.
Woronko, B.
Madeja, J.
Powiązania:
https://bibliotekanauki.pl/articles/2059974.pdf
Data publikacji:
2014
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Eemian-Weichselian
river deposits
climate change
environmental change
Opis:
A fragment of the middle terrace in the VistulaRivervalley, nearby the railway station in Kraków, is formed by fluvial channel and overbank deposits of the PrądnikRiver, which bear a record of various environments affected by changing climatic conditions. The sedimentary succession includes two complexes that differ in lithofacies. The older complex comprises fining-upward deposits (channel sand and gravelly sand with medium- and large-scale trough cross-stratification) and, less frequently, sand with planar cross-stratification overlain by silt with intercalations of biogenic deposits of abandoned channels. Vegetation accompanying the deposition of biogenic layers was typical of boreal coniferous forests, dominated by Pinus sylvestris with a small admixture of Larix, Pinus cembra, Picea, Betula, and Populus. Periodically, the landscape passed into open areas overgrown by woody tundra. The complex developed as a result of activity of a meandering river under conditions of a moderately cool climate. The younger complex includes the sand lithofacies with horizontal stratification and low-angle cross-stratification, overlain by alternating sands and silts. The topmost part is represented by sands with large- and medium scale planar cross stratification. Lack of biogenic deposits and considerable amount of frosted quartz grains in alluvial sediments indicate aeolian processes of greater intensity, periglacial conditions and evolution towards a braided or transitional river. Pollen successions, absolute dating and studies of structural and textural features of the sediment suggest that the time of its deposition may be estimated at a range between the close of the Eemian Interglacial and the Weichselian Middle Pleniglacial (OIS 5e–OIS 3).
Źródło:
Geological Quarterly; 2014, 58, 1; 71--84
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dumpstones as records of overturning ice rafts in a Weichselian proglacial lake (Rügen Island, NE Germany)
Autorzy:
Pisarska-Jamroży, M.
Van-Loon, A. J. T.
Bronikowska, M.
Powiązania:
https://bibliotekanauki.pl/articles/2060089.pdf
Data publikacji:
2018
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
dumpstones
dropstones
ice-rafted debris
Weichselian
glaciolacustrine sediments
Opis:
Dumpstones and dropstones up to 0.8 m in size occur in a silty/sandy Weichselian glaciolacustrine succession near Dwasieden on Rügen Island in the SW Baltic Sea (NE Germany). The deposits are exceptional because two levels of dumpstones and dropstones are present, suggesting two dumping phases interrupting characteristic fine-grained glaciolacustrine sedimentation. Plastic downwarping of sediments below the dumpstones and dropstones result in soft-sediment deformation structures. The distribution and orientation of the long axes of the clasts are useful tools for the reconstruction of the state of the lake bottom, as well as for the water depth. The horizontal position of the gravels and boulders (parallel to the bedding) suggests deposition in relatively shallow-water. The dumping events are linked to iceberg rafting in a glacial lake during the Weichselian Glaciation (MIS 2).
Źródło:
Geological Quarterly; 2018, 62, 4; 917-924
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulation of the shorelines of glacial Lake Peipsi in Eastern Estonia during the Late Weichselian
Autorzy:
Rosentau, A.
Hang, T.
Miidel, A.
Powiązania:
https://bibliotekanauki.pl/articles/2058810.pdf
Data publikacji:
2004
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Late Weichselian
glacial Lake Peipsi
proglacial environment
GIS
water level changes
glacial rebound
Opis:
Digital reconstruction of the evolution of glacial Lake Peipsi, Eastern Estonia, was based on a geographic information system (GIS) method that removed isostatically deformed palaeowater planes fromthe current digital terrain model. A reconstruction of the proglacial water levels was performed with respect to geomorphological correlation of river terraces, raised shorelines and eroded surfaces of various aqueoglacial landforms. The configuration of shorelines, main outlets and water depths of glacial Lake Peipsi, corresponding to the Otepää, Piirissaar, Kaiu and Pandivere–Neva stades during the deglaciation of the Lake Peipsi depression, was simulated. The two approaches used, reflecting the geomorphological correlation of Raukas and Rähni (1969) and Hang (2001), are discussed.
Źródło:
Geological Quarterly; 2004, 48, 4; 299--307
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Streamlined topographical features in and around the Gulf of Riga as evidence of Late Weichselian glacial dynamics
Autorzy:
Tsyrulnikov, A.
Tuuling, I.
Hang, T.
Powiązania:
https://bibliotekanauki.pl/articles/2060206.pdf
Data publikacji:
2008
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Gulf of Riga
Baltic Sea
Late Weichselian glaciation
Riga ice stream
glacial topography
bottom relief
Opis:
Based on various cartographic sources, a digital terrain model and acoustic profiling data, linear relief features of glacial origin have been distin guished and analysed in the Gulf of Riga and adjacent mainland areas in order to reconstruct the dynamics and pathways of former ice streams. North-east–south-west oriented features in the till topography prevail in the central part of the gulf and along the southern coast of the island of Saaremaa, which corroborate the previously known south/south-east di rection of the main Riga ice stream. North-east to south-west directed features dominate in the Pärnu Bay and around the Irbe Strait. Similar deviations from the Riga ice stream are most likely due to ice divide zones, namely the Sakala Upland in Southern Estonia and Kurzeme in north western Latvia, which locally changed the course of the main ice flow. The influence of the Kurzeme ice divide is traceable at the bottom of the gulf up to the southern coast of Saaremaa. There is no evidence of an ice-marginal zone cross ing the central part of the Gulf of Riga as was supposed earlier. The Pandivere-Neva and Palivere ice-marginal zones, which merge on the Sorve Peninsula, probably continue offshore into the Irbe Strait. As the age of the glacier relieffeatures is poorly contained, the chronologi reconstruction of the ice dynamics is tentative.
Źródło:
Geological Quarterly; 2008, 52, 1; 81-81
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Radiocarbon ages of bones from Vistulian (Weichselian) cave deposits in Poland and their stratigraphy
Autorzy:
Lorenc, M.
Powiązania:
https://bibliotekanauki.pl/articles/139041.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Radiocarbon (C-14) dating of bones
Vistulian (Weichselian)
chronostratigraphy
cave deposits/sediments
redeposition
węgiel aktywny
datowanie kości
vistulian
chronostratygrafia
osady jaskiniowe
redepozycja
Opis:
Twenty-six bone samples from cave sediments mainly of Vistulian (Weichselian) age were radiocarbon (AMS) dated. The material comes from seven localities in the Krakow-Czestochowa Upland and in Podhale (southern Poland). These are: the Komarowa Cave, the Deszczowa Cave, the Upper Rock Shelter of the Deszczowa Cave, the cave in Dziadowa Skala, the Saspowska Zachodnia Cave, the Mamutowa Cave and the Oblazowa Cave. The obtained radiocarbon ages of most of the samples differs from their stratigraphy as formerly proposed. The reasons for this discrepancy are discussed. Also examined were the radiocarbon ages of bones from other caves in the study area. Most of the dated bones are shown to have come from relatively short time periods. The existing data on radiocarbon age of bones from Vistulian cave deposits of the Krakow-Czestochowa Upland and Podhale are summarized.
Źródło:
Acta Geologica Polonica; 2013, 63, 3; 399-424
0001-5709
Pojawia się w:
Acta Geologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Heavy minerals as a tool to reconstruct river activity during the Weichselian glaciation (Toruń Basin, Poland)
Autorzy:
Weckwerth, Piotr
Chabowski, Marek
Powiązania:
https://bibliotekanauki.pl/articles/94678.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
heavy minerals
ice-marginal valley
river-discharge regime
channel-pattern transformation
Toruń Basin
Weichselian
ciężkie minerały
pradolina
dorzecze Torunia
zlodowacenie północnopolskie
Opis:
The heavy-mineral composition of the Weichselian fluvial successions deposited by an ephemeral meandering river and by a sand-bed braided river in the Toruń Basin (central Poland) was analysed. On the basis of a lithofacies analysis, in combination with the composition of the heavy-mineral assemblages, the fluvial processes and river-channel morphology were reconstructed. This allows determining the provenance of the fluvial deposits and the rivers’ discharge regimes. A model is proposed which can explain the changes in the amount of individual minerals in the fluvial sediments of different ages under the conditions of the oscillating Scandinavian ice sheet. The model assumes that, during the ice-sheet advances, the proglacial streams supplied large amounts of heavy minerals that were less resistant to mechanical abrasion. During the main phase of the ice-sheet retreat, the distance between the ice sheet and the Toruń Basin increased, and the amount of non-resistant minerals diminished as a result of sediment reworking in proglacial rivers. Due to the unique location of the Toruń Basin at the front of the Scandinavian ice sheet during the Weichselian glaciation, the heavy-mineral assemblages in the fluvial deposits form a valuable tool for the recognition of the ice-sheet extent.
Źródło:
Geologos; 2013, 19, No. 1-2; 25-46
1426-8981
2080-6574
Pojawia się w:
Geologos
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Morfologia osadów podłoża zlodowacenia Wisły na obszarze polskiej części lobu Odry
Morphology of the Vistulian (Weichselian) glaciation substratum in the area of Polish part of the Odra lobe
Autorzy:
Hermanowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/2066059.pdf
Data publikacji:
2007
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
gliny
zlodowacenia Wisły
lob Odry
piętro Pomorskie
drenaż subglacjalny
till
Vistulian (Weichselian) glaciation
Źródło:
Przegląd Geologiczny; 2007, 55, 2; 133-133
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Drenaż subglacjalny i jego wpływ na dynamikę lobu Odry zlodowacenia wisły
Subglacial drainage and its influence on the dynamics of the Weichselian Odra lobe
Autorzy:
Hermanowski, P.
Piotrowski, J. A.
Powiązania:
https://bibliotekanauki.pl/articles/2074717.pdf
Data publikacji:
2009
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
drenaż subglacjalny
lob Odry
dynamika ruchu lodowca
zlodowacenia Wisły
subglacial drainage
Odra lobe
groundwater
ice movement dynamics
Weichselian glaciation
Opis:
In this paper we have analyzed the influence of the Weichselian ice sheet advance on the groundwater system in the Odra lobe area using hydrogeological numerical modelling performed with the finite difference method. The results indicate entire re-organization of the groundwater system in relation to non-glacial times mainly affecting the flow directions, velocities and fluxes. The re-organization of groundwater flow was caused by the pressure gradient imposed by the sloping ice sheet surface especially obvious under the ice margin and some distance in front of it. Simulated groundwater flow velocities are significantly higher than the present velocities in that area while the major groundwater flow direction is to the south, i.e. opposite to the present direction. Coupling the simulation results with assumed basal melting rate suggests that only a small fraction of basal meltwater [~24%) could have drained through the bed. The surplus water likely accumulated at the ice/bed interface facilitating faster ice flow of the Odra lobe due to enhanced basal sliding and bed deformation.
Źródło:
Przegląd Geologiczny; 2009, 57, 6; 504-512
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mollusc faunas of lake deposits in Gorzów Wielkopolski (NW Poland) as an indicator of environmental changes during Eemian and Early Weichselian
Autorzy:
Alexandrowicz, Witold Paweł
Skoczylas, Sylwia
Sobczyk, Artur
Stefaniak, Krzysztof
Kotowski, Adam
Przybylski, Bogusław
Ciszek, Dariusz
Badura, Janusz
Urbański, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/2060111.pdf
Data publikacji:
2021
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
palaeolake
malacofauna
environmental changes
Eemian interglacial
Early Weichselian
NW Poland
Opis:
During the construction of the S-3 road near Gorzów Wielkopolski, a sedimentary succession of the Eemian Interglacial and the older part of the Weichselian Glaciation were exposed. The succession, ~22 m thick, consists of lacustrine and fluvioglacial deposits. Lake sediments, mainly calcareous gyttja with peat intercalations, represent the infills of two palaeolakes. The almost complete skeleton of a forest rhinoceros, Stephanorhinus kirchbergensis, and a bone of the fallow deer Dama dama were found in the older lake deposits. Mollusc shells were numerous in both lake sequences, analysis of which revealed two types of assemblage, representing the coastal, littoral zone of a shallow lake with a muddy bottom. The sequence of mollusc communities observed in vertical succession allowed reconstruction of environmental changes during deposition. Several hydrological changes have been recognized within the palaeolake, especially water level fluctuations probably due to climate change.
Źródło:
Geological Quarterly; 2021, 65, 3; 65: 36
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Young Baltic advance in the western Baltic depression
Autorzy:
Stephan, H. J.
Powiązania:
https://bibliotekanauki.pl/articles/2059318.pdf
Data publikacji:
2001
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Palaeo-ice stream
Baltic Depression
Weichselian
till facies
ice flow
Opis:
The last Weichselian glacial advance into the western Baltic depression, the so-called "Young Baltic" glacier advance is described. In the southern Baltic depression, ice masses flowed westwards and fanned out in the western Baltic region where they terminated along the end moraines of the East Jutland advance (Denmark), Sehberg advance (Schleswig-Holstein) and Mecklenburg advance (Mecklenburg-Vorpommern). The westward ice advance is likely due to the rapid melting of Norwegian and Swedish ice masses which had previously blocked the more easterly ice masses from draining to the west and north-west. The deposition of a purely eastern-sourced debris facies by a Baltic ice stream in the far west might be the result of ice/bed separation during flow.
Źródło:
Geological Quarterly; 2001, 45, 4; 359-364
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New approach to garnet redistribution during aeolian transport
Autorzy:
Lisá, L.
Buriánek, D.
Uher, P.
Powiązania:
https://bibliotekanauki.pl/articles/2059212.pdf
Data publikacji:
2009
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Weichselian
Pleistocene
Czech Republic
aeolian sediments
garnet composition
provenance
Opis:
Garnet composition within Late Pleistocene (Weichselian) loess and loess-like deposits was studied in 13 samples of sediment heavy mineral fractions from Moravia and Silesia (Czech Republic). Four areas differing in garnet chemistry were identified, and some regional trends in garnet composition changes were documented. The data obtained support the generally accepted conclu ion of prevailing westerly winds during Weichselian loess deposition. Metamorphic rocks of the Bohemian Massif together with contributions fromig neous (mainly granitic) and sedimentary rocks were indicated as a source for the Weichselian loess and loess-like deposits studied. Local differences in garnet composition depend on the basement source rocks, on prevailing wind direction, on regional geomorphology and on transport distance.
Źródło:
Geological Quarterly; 2009, 53, 3; 333-340
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Transformacja form korytowych na przykładzie aluwiów piaskodennych rzek roztokowych środkowego vistulianu w Kotlinie Toruńskiej
Transformation river channel macroforms : a case study of Weichselian sand-bed braided river sediments in the Toruń Basin
Autorzy:
Weckwerth, P.
Powiązania:
https://bibliotekanauki.pl/articles/294422.pdf
Data publikacji:
2013
Wydawca:
Stowarzyszenie Geomorfologów Polskich
Tematy:
piaskodenna rzeka roztokowa
odsypy proste i złożone
pradolina
zlodowacenie Wisły
sand-bed braided river
unit and compound bars
Weichselian glaciation
Opis:
Wyniki badań sedymentologicznych prowadzonych w północnej części Kotliny Toruńskiej pozwoliły na rozpoznanie zmian architektury środowiska sedymentacji korytowej piaskodennych rzek roztokowych. Rzeki te funkcjonowały w czasie środkowego vistulianu, a ich osady należą do górnego ogniwa formacji z Zielonczyna. Ewolucja sedymentacji fluwialnej następowała w dwóch fazach, którym odpowiadają odmienne formy korytowe. W pierwszej fazie dno koryta roztokowego zdominowane było przez pojedyncze odsypy poprzeczne, zaś w drugiej doszło do rozwoju złożonych odsypów śródkorytowych w wyniku łączenia się odsypów pojedynczych. Główną przyczyną transformacji morfologii koryta rzeki była zmiana reżimu rzek z niwalnego na proglacjalny w czasie awansu czoła lądolodu w stadiale głównym zlodowacenia wisły oraz rozwój systemu pradolinnego. Transformacja morfologii koryt skutkowała także wzrostem tempa agradacji ich osadów.
The results of sedimentological research documented changes of architectural elements of fluvial sedimentary environment of sand-bed braided rivers in the Toruń Basin. These rivers existed at the middle Weichselian and their deposits belong to the upper member of Zielonczyn Formation. The evolution of fluvial sedimentation took place in the two phases, which correspond to different channel macroforms. The braided river bed was dominated by a unit bars during the first phase, while in the second phase were evolved compound mid-channel bars as a result of the amalgamation of unit bars. The main causes of the transformation of river channel morphology in the area of the Toruń Basin during the Weichselian glaciation included changes in river regime from nival to proglacial and development of ice-marginal valley. Transformation of channel morphology resulted in an increase in the aggradation rate.
Źródło:
Landform Analysis; 2013, 25; 169-177
1429-799X
Pojawia się w:
Landform Analysis
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Marine terraces in Kaffioyra and Hermansenoya (Oscar II Land, NW Spitsbergen)
Autorzy:
Jaworski, T.
Powiązania:
https://bibliotekanauki.pl/articles/295024.pdf
Data publikacji:
2010
Wydawca:
Stowarzyszenie Geomorfologów Polskich
Tematy:
marine terraces
raised beaches
Late Weichselian marine limi
Svalbard
Kaffioyra
Hermansenoya
Opis:
The main relief elements which document the sea level changes on the Kaffioyra Plain and the Isle of Hermansenoya, including the sea transgressions, are both abrasive (marine terraces) and accumulative (raised beaches). Such landforms have been relatively well preserved in the area of Kaffioyra. However, the issues relating to the number of such forms and their age remain questionable. They refer to the number of glacial episodes, the extension of the glaciers during these periods as well as the limit of the sea transgressions during and after the deglaciation of the NW Spitsbergen during the Weichselian and Holocene periods. The first detailed geomorphological research which was conducted in Kaffioyra and its vicinity and included geomorphological mapping, was carried out by Niewiarowski and Sinkiewicz during the Toruń Polar Expeditions to Spitsbergen in 1978 and 1985 (Niewiarowski et al. 1993). The authors listed the exact number and extension of the old marine terraces as well as the Late Weichselian marine limit. According to these studies, the Kaffioyra's marine terraces are of two generations. The Isle of Hermansenoya, located four km off the Kaffioyra's shores, has one generation of former marine terraces. The maximum Late Weichselian marine limit in Kaffioyra reached 46–48 m a.s.l., while in Hermansenoya it reached about 33 m a.s.l. On both the Kaffioyra Plain and the Isle of Hermansenoya there is evidence of the Holocene sea level changes.
Źródło:
Landform Analysis; 2010, 14; 25-33
1429-799X
Pojawia się w:
Landform Analysis
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Conditions of sedimentation in the Weichselian glaciomarginal zone of northeast ern Germany
Autorzy:
Górska-Zabielska, M.
Powiązania:
https://bibliotekanauki.pl/articles/2060222.pdf
Data publikacji:
2008
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
northeastern Germany
Pomeranian phase
lithofacial analysis
environmental architecture components
Opis:
The conditions of glacigenic sedimentation during the Pomeranian Phase of the Weichselian Glaciation in northeastern Germany are reconstructed on the ba sis of the typical lithofacies successions and the depositional architecture of the distal and proximal parts of a sandur, as well as of those in the hinterland area of the glaciomarginal zone. The proximal parts of the sandur are characterized by the occurrence of boulders, pebbles and gravels, and horizontally stratified sands cut by large channel troughs in the upper parts. The occurrence of the channel structures indicates frequent torrential ablation floods. Horizontally and cross-stratified rhythms of sandy and gravelly lithofacies, indicating pulsatory ablation flows, are also frequent. The distal part of the sandur is dominated by horizontally stratified sands and sands with low- angle tabular cross-stratification. In the hinter land of the Pomeranian Glaciation, a thick layer of till is present, which locally is glaciotectonically deformed. Moraines left during glacial retreat, with gravity-redeposited till, are also present.
Źródło:
Geological Quarterly; 2008, 52, 2; 157-157
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wielkopolska epoka lodowa : osady i formy glacjalne w wybranych stanowiskach Wielkopolski
Autorzy:
Kasprzak, L.
Ewertowski, M.
Szuman, I.
Powiązania:
https://bibliotekanauki.pl/articles/294982.pdf
Data publikacji:
2011
Wydawca:
Stowarzyszenie Geomorfologów Polskich
Tematy:
Weichselian ice sheet
glacial sediments and landforms
Polska
Opis:
Glacial environment is characterised by a very wide variety of sediments. In contrast to other sedimentary environments it is difficult to determine the leading unit. Therefore, more often the complexes of sediments and forms are examined, rather than individual facies indicator. The aim of this paper is to present a diversity of forms and sediments in Wielkopolska (in selected study area, which will be presented during the excursion) with an attempt to interpret their sedimentary environment. The authors do not concentrate on discussion about the importance of frontal or areal deglaciation in the formation and differentiation of forms and sediments. They emphasise the importance of depositional effectiveness.
Źródło:
Landform Analysis; 2011, 16; 155-186
1429-799X
Pojawia się w:
Landform Analysis
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Terrestrial heat flow density in Poland - a new approach
Autorzy:
Szewczyk, J.
Gientka, D.
Powiązania:
https://bibliotekanauki.pl/articles/2059118.pdf
Data publikacji:
2009
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
alaeoclimate
Weichselian glaciation
well logging
geothermics
thermal conductivity
terrestrial heat flow density
Opis:
The Earth’s thermal field, particularly the heat flow density (HFD), is a valuable source of information on geodynamic processes within the Earth’s crust, conditions for hydrocarbon generation and on ar eas and formations promising for geothermal energy. Lithospheric thermal and rheological modelling is critically dependent on high-quality surface heat flow values. The available maps of heat flow density, not only for the area of Poland, are not reliable from the point of view of the current state of knowledge. The main critical factorin determining heat flow density is the knowledge of depth distribution of thermal conductivity. We used a new method of estimating the thermal conductivity from well logging data interpretation with control calibration based on laboratory determined thermal parameters. We con sider that the observed vertical variations of HFD in the shallow part of profiles (<2000 m) are mainly due to a Holocene warming. We have proposed a new original method of determination of HFD based on modelling of palaeoclimatic ef fect. Using this method, we have calculated new HFD values for 308 deep boreholes and completed a new map of this parameter for Poland, which is the first of this type. We propose to undertake a critical analysis of all the existing heat flow data not only for Europe that may change the present understanding of global heat flow.
Źródło:
Geological Quarterly; 2009, 53, 1; 125-140
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Middle and Upper Weichselian Pleniglacial fluvial erosion and sedimenta- tion phases in Southwestern Poland, and their relationship to Scandinavian ice sheet build-up and retreat
Fazy sedymentacyjne i erozyjne środkowego i górnego plenivistulianu oraz ich związek z transgresją i regresją lądolodu skandynawskiego w południowo-zachodniej Polsce
Autorzy:
Krzyszkowski, D.
Kuszell, T.
Powiązania:
https://bibliotekanauki.pl/articles/191674.pdf
Data publikacji:
2007
Wydawca:
Polskie Towarzystwo Geologiczne
Tematy:
Pleistocene
Weichselian
fluvial erosion and sedimention
pollen analysis
14C dating
SW Poland
Opis:
The sequence of Weichselian sediments and processes in SW Poland is almost identical to that of central Poland. Generally, three fluvial units occur, comprising silts and sands coarsening upwards to silts, sands and gravels, with aeolian deposits on top. This suggests very uniform processes throughout the palaeogeographic zone. To the south of this zone, there was extensive loess deposition and glacial deposition to the north. Climatic conditions during the Middle and Upper Weichselian Pleniglacial in SW Poland were similar to those in central Poland and northwestern Europe, though the period of 47-43 kyrs BP was slightly milder in SW Poland (shrub tundra, forest-tundra). Climatic conditions during the periods 38-27 kyrs BP and 23-18 kyrs BP were very uniform throughout central Europe, including SW Poland, though there may have been a strong north-south climatic gradient during the former period, as data from the loessic zone indicate at least patches of boreal forest or forest-tundra conditions in SW Poland at that time. It is also possible that there was a Middle Weichselian Pleniglacial interstadial with a lower age boundary at 25,900 ą 700 years BP, characterised by Pinus-Picea forest with no heliophytes. This interstadial represents the last mild period before the advance of the late Weichselian ice sheet into SW Poland. The Weichselian fluvial deposition of SW and central Poland may have been punctuated by at least three major erosional phases, characterised by similar incision depths during the cold stages. Erosion took place, with certainty, at around 75-60 kyrs BP (Lower Pleniglacial) and 27 kyrs BP, very probably at around 23/22 kyrs and possibly at around 40 kyrs BP, and valley aggradation occurred during the milder stages. The Upper Pleniglacial was characterised by valley aggradation, associated with southward ice sheet advance and restricted fluvial outflow. However, the frequent Middle Pleniglacial Weichselian climatic oscillations did not initiate sedimentation and erosion, they controlled only river discharge and type of fluvial sedimentation and aeolian activity. The occurrence of the erosional and aggradational phases were controlled by the changes in ice volume in Scandinavia, ice sheet build-up and retreat, respectively.
Źródło:
Annales Societatis Geologorum Poloniae; 2007, 77, No 1; 17-38
0208-9068
Pojawia się w:
Annales Societatis Geologorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-25 z 56

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