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    Wyświetlanie 1-13 z 13
    Tytuł:
    Assemblages of molluscs from Sulisławice (Małopolska Upland, southern Poland) and their significance for interpretation of depositional conditions of calcareous tufas in small water bodies
    Autorzy:
    Alexandrowicz, W. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/191610.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    calcareous tufas
    malacofauna
    environmental changes
    Holocene
    Małopolska Upland
    southern Poland
    Opis:
    Small water bodies, occurring behind barriers across valleys, create very advantageous conditions for the sedimentation of calcareous tufas. These sediments usually contain rich and diversified malacocoenoses. The composition and structure of these associations are closely linked to environmental changes during the accumulation of the sediments. At the Sulisławice locality, the remnants of two barriers, composed of hard, calcareous tufa, were found. Behind them, sequences of granular, calcareous tufas were preserved, forming terraces, elevated up to 3 m above the level of the present stream bed. The age of the sediments was obtained from radiocarbon dating and is referable to the Atlantic Phase. The rich malacofauna, occurring in these tufas, permitted the recognition of four types of faunistic association, in a sequence that corresponds to phases in the development of the water bodies. Three of them are characterised by the dominance of aquatic species and permit the reconstruction of specific features of the body of water. In the fourth association, terrestrial species predominate. A detailed, malacological analysis was the basis for a model of the evolution of the water bodies, occurring behind the barriers. The model is more widely applicable to the sediments of similar origin, frequently found in upland regions of Poland and other parts of Europe.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2012, 82, 2; 161--176
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Textural characteristics, mode of transportation and depositional environment of the Stormberg Group in the Eastern Cape, South Africa: evidence from grain size and lithofacies analyses
    Autorzy:
    Chima, Priscilla
    Baiyegunhi, Christopher
    Powiązania:
    https://bibliotekanauki.pl/articles/2204351.pdf
    Data publikacji:
    2022
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    grain size distribution
    textural parameters
    lithofacies classification
    hydrodynamic energy conditions
    Triassic
    Jurassic
    rozkład wielkości ziarna
    parametry teksturalne
    klasyfikacja litofacji
    warunki hydrodynamiczne
    warunki energetyczne
    trias
    jura
    Opis:
    The Stormberg Group comprises the Molteno, Elliot and Clarens formations and is one of four stratigraphical groups that make up the Karoo Supergroup in South Africa. The group is the highest unit in the Karoo Basin, representing the final phase of preserved sedimentation. The major problem with the Stromberg Group is that the mode of transport, hydrodynamic energy conditions and depositional environment are still poorly understood. For the present paper, grain size and lithofacies studies on selected sandstones from the Molteno, Elliot and Clarens formations were performed so as to elucidate their textural characteristics, depositional processes, sedimentation mechanisms and hydrodynamic energy conditions and to discriminate different depositional environments. The statistical parameters of grain size distribution (mean grain size, standard deviation, skewness and kurtosis) show that the sandstones are predominantly unimodal, fine grained, moderately well sorted, mesokurtic and near symmetrical. The bivariate diagrams of the aforementioned statistical parameters demonstrate that river and aeolian dune had the greatest impact on the depositional environments. Likewise, the C-M pattern (Passega diagram) shows that the sandstones were mostly deposited through tractive current process. Furthermore, the C-M diagram reveals the prevalence of rolling, suspension and graded suspension modes of sediment transportation. Seventeen sedimentary lithofacies were identified and grouped into seven lithofacies associations. These lithofacies associations indicate braided channel, overbank and swamp deposits for the Molteno Formation, alluvial fan/floodplain and playa deposits for the Elliot Formation and aeolian deposits for the Clarens Formation.
    Źródło:
    Geologos; 2022, 28, 1; 61--78
    1426-8981
    2080-6574
    Pojawia się w:
    Geologos
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Depositional conditions of the Upper Younger Loess during the Last Glacial Maximum in central and eastern Europe
    Autorzy:
    Dzierżek, Jan
    Lindner, Leszek
    Chlebowski, Roman
    Szymanek, Marcin
    Bogucki, Andriy
    Tomeniuk, Olena
    Powiązania:
    https://bibliotekanauki.pl/articles/24024703.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    North European Loess Belt
    Vistulian glaciation
    aeolian processes
    palaeowind circulation
    heavy minerals
    północnoeuropejski pas lessowy
    zlodowacenie Wisły
    procesy eoliczne
    minerały ciężkie
    Opis:
    This paper is a summary of the results of research on the accumulation conditions of the Upper Younger Loess (LMg) in Poland and Bug loess (bg) in Ukraine from the maximum stage (MIS 2) of the Vistulian (Weichselian) Glaciation in central and eastern Europe. These studies included an analysis of the morphological (topographic) situation of the loess cover, its grain size and heavy mineral composition, the preserved structures of loess sedimentation as well as mollusc and pollen analyses of this loess. They revealed that the accumulation of Upper Younger Loess (UYL) might have been more dependent on the prevailing moisture conditions than previously thought. These conditions could have been caused by cold air masses from an ice sheet and warm air masses from the Mediterranean Sea and Atlantic coming together in the Carpathians and the Holy Cross Mountains and favouring the formation of dust storms and precipitation. In this process, a loading of loess dust (formed from local rocks weathering in periglacial conditions) by atmospheric moisture particles was especially significant. The moist substrate not only favoured the periodic development of vegetation and molluscs but also enabled the interception of dust and the accumulation of an increasingly thick loess cover. Westerly and south-westerly winds predominated in the UYL as indicated by the topographic position of loess patches and the mineral composition of the studied loess. Periodically an increased air circulation from the east and northeast occurred.
    Źródło:
    Acta Geologica Polonica; 2022, 72, 4; 369--389
    0001-5709
    Pojawia się w:
    Acta Geologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Granulometric and facies analysis of Middle–Upper Jurassic rocks of Ler Dome, Kachchh, western India: an attempt to reconstruct the depositional environment
    Autorzy:
    Ghaznavi, Asma A.
    Quasim, M. A.
    Ahmad, A. H. M.
    Ghosh, Sumit K.
    Powiązania:
    https://bibliotekanauki.pl/articles/94565.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    grain size analysis
    hydrodynamic conditions
    microtexture
    sedimentation
    marine environment
    analiza wielkości ziarna
    warunki hydrodynamiczne
    mikrotekstura
    sedymentacja
    środowisko morskie
    Opis:
    Grain size analysis is an important sedimentological tool used to unravel hydrodynamic conditions, mode of transportation and deposition of detrital sediments. For the present study, detailed grain size analysis was carried out in order to decipher the palaeodepositional environment of Middle–Upper Jurassic rocks of the Ler Dome (Kachchh, western India), which is further reinforced by facies analysis. Microtextures were identified as grooves, straight steps and V-shaped pits, curved steps and solution pits suggesting the predominance of chemical solution activity. Grain size statistical parameters (Graphic and Moment parameters) were used to document depositional processes, sedimentation mechanisms and conditions of hydrodynamic energy, as well as to discriminate between various depositional environments. The grain size parameters show that most of the sandstones are medium- to coarse-grained, moderately to well sorted, strongly fine skewed to fine skewed and mesokurtic to platykurtic in nature. The abundance of medium- to coarse-grained sandstones indicates fluctuating energy levels of the deposition medium and sediment type of the source area. The bivariate plots show that the samples are mostly grouped, except for some samples that show a scattered trend, which is either due to a mixture of two modes in equal proportion in bimodal sediments or good sorting in unimodal sediments. The linear discriminant function analysis is predominantly indicative of turbidity current deposits under shallow-marine conditions. The C-M plots indicate that the sediments formed mainly by rolling to bottom suspension and rolling condition in a beach subenvironment. Log probability curves show that the mixing between the suspension and saltation populations is related to variable energy conditions.
    Źródło:
    Geologos; 2019, 25, 1; 51-73
    1426-8981
    2080-6574
    Pojawia się w:
    Geologos
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Depositional conditions and petroleum potential of the Middle Triassic Passhatten Member (Bravaisberget Formation), Spitsbergen
    Autorzy:
    Karcz, Przemysław
    Powiązania:
    https://bibliotekanauki.pl/articles/2051337.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Arctic
    Spitsbergen
    Middle Triassic
    Bravaisberget Formation
    depositional conditions
    organic carbon
    petroleum potential
    Źródło:
    Polish Polar Research; 2014, 1; 41-71
    0138-0338
    2081-8262
    Pojawia się w:
    Polish Polar Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Groundwater conditions along the seawater/freshwater interface on a volcanic island and a depositional area in Japan
    Autorzy:
    Marui, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2058825.pdf
    Data publikacji:
    2003
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    submarine groundwater discharge
    seawater/freshwater interface
    groundwater flow
    far-east area
    Opis:
    Fresh groundwater comes in contact with seawater at the downstream end of its flow system. Most previous work has discussed the shape of the seawater/freshwater interface on the basis of Ghyben-Herzberg’s law. The groundwater, however, pushes the seawater farther offshore side than predicted by the law, giving rise to freshwater flows even below the bottom of the sea. A previous study found that the distribution of submarine groundwater discharge and the point of the seawater/freshwater interface on the marine floor are closely related. The cross-sectional shape of the interface onshore is clarified by using electrical tomography and observation of groundwater and soil samples taken from observation wells located in the coastal area (by a volcanic island and associated deposits). In both fields, diving was carried out to find the submarine groundwater discharge on the sea-floor and to take water samples. From the analysis of the water discharged on the marine floor and/or electric conductivity measurements in the marine sands, it is shown the freshwater flows (discharges) along the interface, even in the submarine deposits. The understanding of groundwater flows at the downstream end of the groundwater flow system (from mountainous to marine) will facilitate the development of water resources and the evaluation of environments.
    Źródło:
    Geological Quarterly; 2003, 47, 4; 381-388
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Warunki depozycji szczątków kręgowców w osadach środowisk okołopływowych dolnego wapienia muszlowego (anizyku) w kopalni „Stare Gliny” koło Olkusza
    Depositional conditions of vertebrate remains within the Lower Muschelkalk (Anisian) peritidal carbonates of the “Stare Gliny” quarry near Olkusz (Kraków-Silesia region, southern Poland)
    Autorzy:
    Matysik, M.
    Surmik, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/2075514.pdf
    Data publikacji:
    2016
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    szczątki kręgowców
    facja
    urwisko
    dolny wapień muszlowy
    anizyk
    Śląsk
    vertebrate remains
    cliff facies
    Lower Muschelkalk
    Anisian
    Silesia
    Opis:
    A detailed sedimentological study of the Lower-Middle Muschelkalk (Middle Triassic) carbonate succession exposed at the “Stare Gliny” quarry near Olkusz (Kraków-Silesia region, southern Poland) revealed numerous vertebrate remains within its lowermost sedimentary unit. This 7-m-thick package onlaps a gently-inclined surface of a paleoisland made of the Devonian (Givetian) dolostones, and was deposited during a transgressive phase of the second Middle Triassic transgression onto the southern Poland. The package consists largely of: 1) unfossiliferous dolosiltites and fine-grained dolarenites, the tops of which commonly contain root molds and small-scale karstic forms; 2) breccias (minor conglomerates) with lithoclasts of Givetian dolostones; 3) dolocretes; and 4) dolomitic shales. This lithofacies association represents a restricted lagoon which experienced longer periods of emersion. A minor occurrence of cryptalgal laminites reflects only temporary sedimentation in the intertidal zone of a tidal flat. The bone fragments occur within all types of lithofacies, but the macroscopically distinguishable specimens have been found exclusively in the dolocretes. The poor preservation and advanced disarticulation of bones hinder unequivocal assessment of their affinity. The small size of bones suggests that they represent prolacertiforms (perhaps juvenile Macrocnemus) or other small archosauromorphs similar in sizes to Protorosaurus or Czatkowiella whose remains were found in the 1950s within cave deposits, in the same outcrop. Macrocnemus widely inhabited Middle Triassic lagoons and tidal flats across Paleo-Europe and thus seems to fit well to the peritidal setting surrounding the “Stare Gliny” paleoisland. The bone-bearing package occurs 30 metres below the 5-m-thick oncolitic package that is widely regarded as a correlation horizon over the entire Kraków-Silesia region, and 15 metres below the sequence boundary marking the top of the Górażdże Beds in the Opole region and the Olkusz Bedsin the Kraków-Silesiaregion.On the basis of the secor relations,a conclusion can be made that the vertebrate assemblage is Bithynian/Pelsonian (middle Anisian) in age.
    Źródło:
    Przegląd Geologiczny; 2016, 64, 7; 495--503
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cechy sedymentologiczne i warunki depozycji osadów stożka akumulacyjnego w dolinie rzeki Sertejki (zachodnia Rosja)
    Sedimentological features and depositional conditions of deposits of the accumulative fan in the Serteyka River valley (Western Russia)
    Autorzy:
    Piech, Wiktor
    Kittel, Piotr
    Mazurkevich, Andrey
    Pavlovskaia, Elena
    Kazakov, Eduard
    Teltevskaya, Yulia
    Błaszczyk, Krzysztof
    Kotrys, Bartosz
    Powiązania:
    https://bibliotekanauki.pl/articles/578320.pdf
    Data publikacji:
    2018
    Wydawca:
    Łódzkie Towarzystwo Naukowe
    Tematy:
    osady stokowe
    rozcięcia erozyjne
    akumulacja osadów
    antropopresja
    Europa Wschodnia
    slope deposits
    erosion cut
    accumulation
    human impact
    Eastern Europe
    Opis:
    Artykuł skupia się na analizie czynników klimatycznych i antropogenicznych wpływających na rozwój rozległego stożka akumulacyjnego powstałego w dolnym odcinku doliny rzeki Sertejki w zachodniej Rosji. W osadach budujących stożek rozpoznano kilka warstw osadów, tj. trzy serie deluwiów (dolna, środkowa i górna), proluwia, a także koluwia i diamikton rolny, które różnią się cechami tekstualnymi i strukturalnymi. Wykonano analizy uziarnienia i zestawiono cechy teksturalne badanych osadów stokowych: średnią średnicę ziaren, skośność, odchylenie standardowe, kurtozę. Następnie dokonano oraz omówiono relacje wybranych parametrów uziarnienia. Otrzymane wyniki wskazują na niewielką odmienność cech tekstualnych osadów budujących stożek w stosunku do materiału źródłowego. Deluwia dolne charakteryzują się bardzo słabo wykształconym laminowaniem i jasnobrunatnożółtą barwą, deluwia środkowe mają barwę brunatną, a wartości wskaźników teksturalnych są do siebie zbliżone. Znamienne dla deluwiów górnych jest subhoryzontalne warstwowanie. W tej warstwie notowane są również wahania wartości wskaźników teksturalnych. Diamikton rolny jest osadem zagęszczonym i masywnym, powstałym wskutek mieszania deluwiów górnych poprzez orkę. Wszystkie wyróżnione serie cechują się małą zawartością węglanu wapnia. Rozwój stożka rozpoczął się w trakcie pessimum Małej Epoki Lodowej wskutek zmian klimatu i zwiększenia liczby ulewnych deszczy oraz intensyfikacji antropopresji. Rozpoznano sześć zasadniczych etapów kształtowania badanej formy, które są wiązane głównie ze zmianami użytkowania terenu i wzrostem intensywności antropopresji na przestrzeni ostatnich 300 lat.
    The article focuses on the analysis of climatic and anthropogenic factors affecting the development of the accumulative fan in the lower sector of the Serteyka River valley in Western Russia. Within the fan deposits, several layers of sediments were identified, i.e. three units of deluvium (lower, central and upper), proluvium and also colluvium and tillage diamicton, which differ in textural and structural features. The grain size analysis was made and the textural features of the studied slope sediments were compared: mean grain diameter, skewness, standard deviation, kurtosis. Then, the relations of selected grain size parameters were interpreted. The obtained results indicate a rather small transformation of the accumulative fan in relations to the textural features of the source material. Lower deluvium is characterized by very weak lamination and light brown yellow color, the central deluvium has a brown color and the textual indicators are similar. Subhorizontal stratification is significant for the upper deluvium. This layer is characterized also by fluctuations in the value of sedimentological indices. Tillage diamicton is represented by thickened and massive sediment formed as a result of mixing of the upper deluvium by plowing. All featured series have a low content of calcium carbonate. The development of the fan began during the pessimum of the Little Ice Age due to climate change and an increase in the number of heavy rains, an also as a result of rising human impact. Six stages of the development of the studied relief form were identified, which are mainly associated with changes in land use and an increase in the intensity of anthropopression over the last 300 years.
    Źródło:
    Acta Geographica Lodziensia; 2018, 107; 215-238
    0065-1249
    Pojawia się w:
    Acta Geographica Lodziensia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sedimentological features and depositional conditions of accumulative fans in the lower Serteyka River valley, Western Russia
    Autorzy:
    Piech, Wiktor
    Powiązania:
    https://bibliotekanauki.pl/articles/2037000.pdf
    Data publikacji:
    2021-12-23
    Wydawca:
    Łódzkie Towarzystwo Naukowe
    Tematy:
    slope processes
    deluvia
    denudation valleys
    erosion cuts
    sediment lithodynamics
    Late Weichselian
    Holocene
    Little Ice Age
    Opis:
    In the Serteyka River valley in western Russia, eight accumulative fans formed at the mouths of ravines were examined geologi-cally and geomorphologically. The test samples were collected from individual geological drillings made with a manual probe, as well as from excavations in the central and distal zones of the fans. Using the Gradistat program, sedimentological indicators were calculated, i.e. mean grain diameter (MZ), standard deviation (sorting – σI), skewness (SkI) and kurtosis (KG),and then particle-size distribution frequency curves, cumulative curves and a Passega C/M diagram were drawn. It has been documented that the grain size of the fan sediments depends on the characteristics of the source material. Analysis of sedimentological indicators (mean grain diameter, sorting, skewness, kurtosis) showed the studied fans deposits to have a large variability of erosion and accumulation conditions. For the deposits of younger fans, the 2nd system of the MZ-versus-σI relationship after Mycielska-Dowgiałło (1995) was distinguished, while for the older, the 2nd, 3rd and 4th systems were recognised. The main process of grain transport within these forms was saltation. The ravines on the eastern slope of the Serteyka valley were most likely created in the periglacial period, while the gullies on the western side of the valley developed in the early modern period.
    Źródło:
    Acta Geographica Lodziensia; 2021, 111; 159-188
    0065-1249
    Pojawia się w:
    Acta Geographica Lodziensia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Geochemistry of Middle Jurassic mudstones (Kraków-Częstochowa area, southern Poland): interpretation of the depositional redox conditions
    Autorzy:
    Szczepanik, P.
    Witkowska, M.
    Sawłowicz, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059479.pdf
    Data publikacji:
    2007
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Middle Jurassic
    Częstochowa Clay Formation
    palaeoenvironment
    geochemical parameters
    redox conditions
    Opis:
    Middle Bathonian iron-bearing dark grey mdstones and claystones from the Kraków-Czestochowa Upland (southern Poland) were subjected to geochemical and mineralogical study in order to evaluate palaeo-redox conditions of their deposition and diagenesis. They are mainly composed of kaolinite, with smaller amounts of other clay minerals and detrital quartz. Organic matter is composed of type III and/or IV kerogen and its d13C is between -23 and -24‰, suggesting a mainly terrigenous source, with a possible admixture of marine input. Most geochemical parameters: (total organic carbon) TOC/S, U/Th, Ni/Co, V/Cr, (Cu+Mo)/Zn ratios, authigenic uranium content, and Fe-TOC-S relationship, indicate deposition under oxygenated bottom water conditions. By contrast, DOP (degree of pyritization) and V/V+Ni indices suggest a dysoxic environment. However, DOP probably reflects redox conditions in the sediment during diagenesis rather than in the over laying water column. The composition of the organic matter and the domination of pyrite euhedra over framboids indicates that the V/V+Ni ratio may not be reliable for determination of redox conditions in the rocks studied. There is no significant difference between the geochemical indices of host rocks with nodules and those with out them.
    Źródło:
    Geological Quarterly; 2007, 51, 1; 57-66
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Depositional redox conditions of the Grybów Succession (Oligocene, Polish Carpathians) in the light of petrological and geochemical indices
    Autorzy:
    Wójcik-Tabol, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059988.pdf
    Data publikacji:
    2015
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Paratethys
    Oligocene
    Grybów Succession
    geochemistry
    organic matter
    Opis:
    This study details the petrology and chemistry of the Oligocene succession of the Grybów Nappe in its stratotype-locality in the Grybów tectonic window (Polish Carpathians). The section studied is composed of the Sub-Grybów Beds, the Grybów Marl Formation (GMF), and the Cergowa Beds, representing the middle to upper part of the Oligocene succession. The rocks studied consist of quartz, calcite, Na-plagioclase, muscovite and clay minerals (illite-smectite with 25–30% of smectite and kaolinite). Additionally, hematite occurs in the GMF and chlorite in the Cergowa Beds, respectively. The macerals assemblage of the GMF is dominated by landplant-derived compounds of liptinite, associated with minor amounts of vitrinite representing type II kerogen. The total organic carbon (TOC) content is between 0.45 and 6.16 wt.%. The δ13Corg values of the GMF vary between –27.1 and –27.9‰. The values of both carbon and oxygen isotopic ratios of carbonates range for δ13C from –1.1 to –4.3‰ VPDB, and for O from –1.5 to –4.8‰ VPDB. The concentrations of Co, U, Ni, As, and Mo are higher in the GMF than in the adjacent strata and positively correlate with TOC and S. Values of the TOC/S and V/V+Ni ratios are 0.7 to 3.5 and 0.67 to 0.78, respectively, and indicate anoxic conditions. The ratios of U/Th and V/Cr (0.3–2.2, 1.18–3.18, respectively) suggest the change of oxic conditions to reducing conditions occurred during the GMF deposition. This change could have been preceded by a plankton bloom, initiated by a nutrient-rich freshwater inflow that is inferred from the decrease of the δ13Ccarb values and the terrestrial detritus supply. Thermal alteration of the Grybów Succession is concluded on the basis of smectite illitisation and low δ18O values.
    Źródło:
    Geological Quarterly; 2015, 59, 4; 603--614
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Depositional conditions on an alluvial fan at the turn of the Weichselian to the Holocene – a case study in the Żmigród Basin, southwest Poland
    Autorzy:
    Zieliński, P.
    Sokołowski, R. J.
    Fedorowicz, S.
    Woronko, B.
    Hołub, B.
    Jankowski, M.
    Kuc, M.
    Tracz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/94513.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    climate change
    periglacial environment
    fluvial processes
    aeolian processes
    luminescence dating
    zmiana klimatu
    środowisko peryglacjalne
    procesy fluwialne
    procesy eoliczne
    datowanie luminescencyjne
    Opis:
    Presented are the results of research into the fluvio-aeolian sedimentary succession at the site of Postolin in the Żmigród Basin, southwest Poland. Based on lithofacies analysis, textural analysis, Thermoluminescence and Infrared-Optical Stimulated Luminescence dating and GIS analysis, three lithofacies units were recognised and their stratigraphic succession identified: 1) the lower unit was deposited during the Pleni-Weichselian within a sand-bed braided river functioning under permafrost conditions within the central part of the alluvial fan; 2) the middle unit is the result of aeolian deposition and fluvial redeposition on the surface of the fan during long-term permafrost and progressive decrease of humidity of the climate at the turn of the Pleni to the Late Weichselian; 3) the upper unit accumulated following the development of longitudinal dunes at the turn of the Late Weichselian to the Holocene; the development of dunes was interrupted twice by the form being stabilised by vegetation and soil development.
    Źródło:
    Geologos; 2016, 22, 2; 105-120
    1426-8981
    2080-6574
    Pojawia się w:
    Geologos
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The depositional conditions of longitudinal dunes based on investigations in the western part of the Lublin Upland, SE Poland
    Autorzy:
    Zieliński, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/294306.pdf
    Data publikacji:
    2003
    Wydawca:
    Stowarzyszenie Geomorfologów Polskich
    Tematy:
    longitudinal dunes
    date Pleistocene
    Lublin Upland
    Opis:
    The development of longitudinal dunes depends on three overlapping factors: the strength and direction of winds, the amount of supplied sand, and the occurrence of vegetation which can fix the rising forms. It is assumed that longitudinal dunes in Polish territory were mainly formed from the arms of parabolic dunes, as a result of the deflation of the central parts of these dunes. However, it is possible that some longitudinal dunes in Poland could also have developed as primary forms. The detailed studies of longitudinal dunes in the western part of the Lublin Upland have revealed an important structural differentiation resulting from various development conditions of each particular form. Three models of development of longitudinal dunes are derived from these investigations: 1)  They are formed by undirectional winds deflating the central parts of parabolic dunes, when sand supply is small, and vegetation fixes the rising forms. 2)  They develop after a change of wind direction by 90°, in consequence of transformation of a single transversal dune or a set of parabolic dunes formed in front of or on an obstruction. 3)  They are primary forms originating at obstructions, when eolian material is transported by bidirectional winds from a narrow (up to 90°) sector.
    Źródło:
    Landform Analysis; 2003, 4; 65-73
    1429-799X
    Pojawia się w:
    Landform Analysis
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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