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    Wyświetlanie 1-6 z 6
    Tytuł:
    The Littorina Sea at the Lithuanian Maritime Region
    Autorzy:
    Bitinas, A.
    Damušyte, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1187359.pdf
    Data publikacji:
    2004
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    coastline
    transgression
    neotectonic
    Littorina Sea
    Post-Littorina Sea
    Opis:
    In the recent decade a number of data of different investigations (pollen, diatom, molluscs analysis, lithological investigations, dating by methods of absolute geochronology, etc.) have been collected during the large-scale geological mapping of Lithuanian Maritime region (Lithuanian Coast). The results of investigations confirmed that there were three Littorina Sea transgressions at the Lithuanian Coast: the first manifested approximately in 8500-7800 conventional 14C years BP, the second (maximal) - in 6200-5900 and the third - in 5300-4000 conv. 14C years BP. The Post-Littorina Sea maximum was in about 3600-3400 conv. 14C years BP. The Littorina Sea shoreline displacement curves were carried out. The present-day positions of shorelines of the Littorina Sea as well as other Baltic basins are displaced in different altitudes in separate parts of the Lithuanian Coast due to oscillatory neotectonic movements of Earth crust blocks during Late Glacial and Holocene.
    Źródło:
    Polish Geological Institute Special Papers; 2004, 11; 37-45
    1507-9791
    Pojawia się w:
    Polish Geological Institute Special Papers
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Glaciotectonic features in Lithuania
    Autorzy:
    Aleksa, P.
    Bitinas, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059381.pdf
    Data publikacji:
    2000
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Lithuania
    Quaternary
    glaciotectonic
    megablock
    thrust fault
    diapir
    Opis:
    Systematic investigations of glaciotectonic features in Lithuania started in 1994. The first glaciotectonic review map of Lithuania has been carried out as a constituent part of the glaciotectonic map of central Europe. Two groups of landforms linked with glaciotectonic structures (composite ridges and massifs, drumlins and flutings) have been distinguished. Distribution of the pre-Quaternary megablocks in the Quaternary deposits is presented also, and the number of megablocks composed of rocks of different age and lithology is directly proportional to their extension in the sub-Quaternary surface. The other more detailed investigations of glaciotectonic features in Lithuania are connected with regular geological mapping in scale of 1:50 000. Results of the first detailed studies of glaciotectonic features (folds, thrust faults, diapirs) investigated in two outcrops in southeastern Lithuania and in the Lithuanian maritime region are presented in the paper.
    Źródło:
    Geological Quarterly; 2000, 44, 1; 9-13
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Geological development of the Nemunas River Delta and adjacent areas, West Lithuania
    Autorzy:
    Bitinas, A.
    Damusyte, A.
    Stančikaite, M.
    Aleksa, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059891.pdf
    Data publikacji:
    2002
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Lithuania
    Lithuanian Maritime region
    Nemunas Delta
    Late Glacial
    Holocene
    geochronology
    palaeogeography
    Opis:
    Geological mapping at a scale of 1:50 000 of the Lithuanian Maritime region has recently been focused on the delta of the Nemunas River and its surroundings. Pollen, diatom and mollusc analyses, lithological investigations, and radiocarbon and optically stimulated luminescence dates have enabled stratigraphic correlation of the Late Glacial and Holocene deposits which make up this delta. Palaeogeographical reconstructions of the southern part of the Lithuanian Maritime region during the maximum extent of the Baltic Ice Lake (~12 000-11 200 years BP), the Ancylus Lake (~8 700-8 500 years BP), the Litorina Sea (~6 100 years BP) and the Post-Litorina Sea (~4 000 years BP) have been made. A geological and geomorphological model of the Nemunas River Delta and its adjacent areas has been constructed. Our results suggest that that part of Nemunas River Delta in Lithuania is very young, having formed during the last 1 000-1 100 years.
    Źródło:
    Geological Quarterly; 2002, 46, 4; 375-390
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Lagoon sediments in the central part of the Vistula spit: geochronology, sedimentary environment and peculiarities of geological settings
    Autorzy:
    Bitinas, A.
    Boldyrev, V.
    Damušyte, A.
    Grigiene, A.
    Vaikutiene, A.
    Žaromskis, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1205004.pdf
    Data publikacji:
    2008
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    gyttja
    lagoon sediments
    neotectonics
    Vistula Spit
    Baltic Sea
    Opis:
    Lagoon gyttja layers occurring in anomalously high position (up to 2.5 m above the present-day sea level) are known from the central part of the Vistula Spit (Kaliningrad region of the Russian Federation). Complex investigations of lagoon sediments (gyttja, sand), including radiocarbon (14C) dating as well as mollusc, pollen and diatom analyses, have been carried out in 2004–2005. The results of these investigations indicate that the lagoon sediments were deposited in the Late Subboreal–Early Subatlantic period in a shallow freshwater, overgrown basin periodically influenced by brackish water. The anomalously high level of the lagoon gyttja is determined by neotectonic activity of Earth’s crust blocks.
    Źródło:
    Polish Geological Institute Special Papers; 2008, 23; 9-20
    1507-9791
    Pojawia się w:
    Polish Geological Institute Special Papers
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The lower reaches of the Nemunas River at the end of the Last (Weichselian) Glacial and beginning of the Holocene
    Autorzy:
    Bitinas, A.
    Druzhinina, O.
    Damušytė, A.
    Napreenko-Dorokhova, T.
    Guobytė, R.
    Mažeika, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2060341.pdf
    Data publikacji:
    2017
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Baltic Sea
    Nemunas Delta
    Ancylus Lake
    palaeogeography
    hydrography
    archaeology
    Opis:
    The Russian–Lithuanian cross-border area around the Nemunas and Šešupė rivers confluence is a key area for solving palaeogeographic issues important for this region: when the Nemunas Delta started to form, why the essential changes of hydrographic network occurred, and so on. The results of conventional radiocarbon (14C) dating and pollen analysis in the present dry valley between the Šešupė River and the Įrutis River as well as the results of former studies at the Riadino-5 archaeological site suggest that the essential changes in the Nemunas River hydrographic system occurred before 9.5 ka, most likely in Preboreal time, when the Nemunas River cut through the Vilkiškė Marginal Ridge and started to flow directly to the west from this ridge into one of the former basins of the Baltic Sea – to the Yoldia Sea, or to the Ancylus Lake. A new divide was formed between the Šešupė and Įsrutis rivers, and the basins of the Nemunas and Prieglius rivers (formerly a single hydrographic system) became two independent drainage basins of the Baltic Sea. The present Nemunas Delta formation started after the Litorina Sea transgression when the Nemunas River mouth moved from a Baltic Sea nearshore position to close to the western margin of the Vilkiškės Marginal Ridge. A set of palaeogeographic reconstructions of the Nemunas and Šešupė rivers confluence area for different periods of the very end of the Last (Weichselian) Glacial and the beginning of the Holocene have been constructed.
    Źródło:
    Geological Quarterly; 2017, 61, 1; 156--165
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Coastal dune dynamics along the northern Curonian Spit, Lithuania : toward an integrated database
    Autorzy:
    Bitinas, A.
    Dobrotin, N.
    Buynevich, I. V.
    Molodkov, A.
    Damušytė, A.
    Pupienis, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/2060456.pdf
    Data publikacji:
    2018
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    palaeosols
    ground-penetrating radar
    GPR
    IR-OSL
    radiocarbon
    magnetic susceptibility
    Opis:
    Sand dunes are the most prominent subjects of geological and geomorphological interest along the Curonian Spit - a mega-barrier that separates the Curonian Lagoon from the Baltic Sea. To date, an assessment of various parameters of migrating dunes along the spit has been based on comparative analysis of old maps or aerial and satellite images, as well as geodetic measurements. These investigations have allowed assessment of dune dynamics over a relatively short historical period (~1700s to present). The most recent detailed investigations of the Dead (Grey) Dunes along the Lithuanian part of the spit using ground-penetrating radar (GPR) and magnetic susceptibility (MS) surveys, supported by a radiocarbon (14C) chronological framework of palaeosols and infrared optically stimulated luminescence (IR-OSL) ages of sand horizons, have advanced our understanding of aeolian landscape evolution. The interpretation of dune activity and stability phases has been generally based on IR-OSL dating results of the sand layers located between radiocarbon-dated palaeosols. However, the influence of soil-forming processes on the IR-OSL dating results related to possible migration of natural radioactive isotopes via aeolian sand layers has not been previously considered. Hypotheses of dune reactivation and migration caused by abrupt regional climate shifts, catastrophic forest fires, anthropogenic influence, and more local forcings have been tested. An integrated approach to dune investigations has offered an estimate of the rates of sand accumulation and key phases of aeolian dynamics during both stormy and calm periods, as well as helped to extend the record of dune evolution to the mid-Holocene. The palaeoenvironmental and palaeodynamic reconstructions of the Dead Dunes suggest that this mid-Holocene phase of dune activity was of a local character and likely did not exceed several centuries.
    Źródło:
    Geological Quarterly; 2018, 62, 3; 553--562
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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