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    Wyświetlanie 1-9 z 9
    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:
    Multi-proxy inferred hydroclimatic conditions at Bęczkowice fen (central Poland); the influence of fluvial processes and human activity in the stone age
    Autorzy:
    Płóciennik, Mateusz
    Jakiel, Aleksandra
    Forysiak, Jacek
    Kittel, Piotr
    Płaza, Dominik K.
    Okupny, Daniel
    Pawłowski, Dominik
    Obremska, Milena
    Brooks, Stephen J.
    Kotrys, Bartosz
    Luoto, Tomi P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2037005.pdf
    Data publikacji:
    2021-12-23
    Wydawca:
    Łódzkie Towarzystwo Naukowe
    Tematy:
    peatland
    palaeoecology
    climate changes
    Late Weichselian
    Early Holocene
    central Poland
    Opis:
    Fens have been forming in the river valleys of central Poland since the Bølling and went through a transformation from fully aquatic to semiterrestrial habitats during the Younger Dryas/Holocene transition. This drove plant and invertebrate communities and left a distinct pattern in chemical sediment composition, which is why river valley peatlands are sensitive palaeo-archives of climatic, hydrological and edaphic changes. Here we reconstruct the Late Weichselian history of the Bęczkowice fen in the upper Luciąża River valley using geochemical, pollen, Cladocera and Chironomidae proxies. Pollen-based age estimation indicates that the analysed peat sequence dates from the Bølling to Early Holocene. The layers 190-170 cm and 125-105 cm of the studied core were reworked by fluvial processes. Chironomidae and Cladocera communities indicate mostly limnetic conditions during the Allerød and early Younger Dryas. Peatland pools were supplied mostly by Luciąża River floods, but also by groundwater. Since the onset of the Holocene, the water level has dropped, eliminating aquatic midges and water fleas, and supporting taxa typical of astatic waters and wet soil.
    Źródło:
    Acta Geographica Lodziensia; 2021, 111; 135-157
    0065-1249
    Pojawia się w:
    Acta Geographica Lodziensia
    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:
    Changes in habitat conditions in a Late Glacial fluviogenic lake in response to climatic fluctuations (Warta River valley, central Poland)
    Autorzy:
    Forysiak, Jacek
    Okupny, Daniel
    Obremska, Milena
    Antczak-Orlewska, Olga
    Płóciennik, Mateusz
    Pawłowski, Dominik
    Baradyn, Daria
    Kotrys, Bartosz
    Luoto, Tomi P.
    Nevalainen, Liisa
    Borówka, Ryszard K.
    Powiązania:
    https://bibliotekanauki.pl/articles/13955341.pdf
    Data publikacji:
    2023
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    multi-proxy analysis
    Late Weichselian
    denudation processes
    palaeoclimate
    central European river
    Opis:
    The Warta River valley was greatly influenced by the ice sheet of the Last Glacial Maximum (LGM). A small peatland located in the Warta drainage system is here used as a palaeoarchive of climatic and habitat changes during the Late Glacial (Weichselian). The Ługi sediment profile was investigated using multi-proxy (pollen, Chironomidae, Cladocera and geochemistry) analyses that recorded changes in a fluviogenic sedimentary depression. After the Poznań Phase (LGM), Ługi functioned as an oxbow lake that was cut off from the active river channel as a result of fluvial erosion. Since that time, the Warta River has flowed only along the section now occupied by the Jeziorsko Reservoir. Sedimentation of lacustrine deposits started at the beginning of the Late Glacial. Summer temperature reconstructions indicate cool Oldest and Younger Dryas, but no clear cooling in the Older Dryas. During the Younger Dryas the palaeolake was completely occupied by a peatland (fen), which periodically dried out during the Holocene. Investigation of this site has tracked the reaction of the habitat to climatic, hydrological and geomorphological changes throughout the Late Weichselian.
    Źródło:
    Geological Quarterly; 2023, 67, 1; art. no. 1
    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:
    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:
    Chronologia i zasięgi nasunięć lądolodu na obszarze lobu Wisły podczas stadiału głównego ostatniego zlodowacenia
    Chronology and extents of ice sheet advances in the Vistula lobe area during the Main Stage of the Last Glaciation
    Autorzy:
    Wysota, W.
    Molewski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2074848.pdf
    Data publikacji:
    2011
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    loby lodowcowe Wisły
    strumień lodu Wisły
    północno-centralna Polska
    skandynawski lądolód
    ostatnie zlodowacenie (LGM)
    ostatnie zlodowacenie Wisły
    Vistula ice lobe
    Vistula ice stream
    north-central Poland
    Scandinavian Ice Sheet
    last glacial maximum (LGM)
    Late Weichselian glaciation
    Opis:
    During the maximum of the last glaciation the Vistula ice lobe was one of the key morphological elements at southern margin of the Scandinavian Ice Sheet in north-central Poland. The area of the Vistula ice lobe experienced two ice sheet advances of varied extent, the earlier one during the Leszno Phase and the younger one in the Poznań Phase. According to the authors, the limit of the Leszno Phase within the study area was much smaller than hitherto accepted and its age is estimated at about 20.5 ka BP. Significant ice sheet retreat was followed by an ice readvance during the Poznań Phase, overriding the extent of the Leszno Phase. The Poznań readvance reached the maximum limit in the Vistula ice lobe area about 18.5 ka BP. It is assumed that the rapid ice sheet transgression during the Poznań Phase (on average 400 m/a) and origin of the Vistula lobe were probably connected with activity of the palaeo-ice stream.
    Źródło:
    Przegląd Geologiczny; 2011, 59; 214-225
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Rekonstrukcja zmian paleośrodowiskowych w eemskich zagłębieniach bezodpływowych przedpola lądolodu ostatniego zlodowacenia na przykładzie stanowiska Stara Maryśka II (Północne Mazowsze, Polska Centralna)
    Paleoenvironmental changes reconstruction in the Eemian kettle holes of the last ice sheet glaciation foregrounds on the example of the Stara Maryśka II site (Northern Mazovia, Central Poland)
    Autorzy:
    Rychel, Joanna
    Sieradz, Dominika
    Massalska, Barbara
    Standzikowski, Karol
    Wasiluk, Radosław
    Woronko, Barbara
    Nawrocki, Jerzy
    Powiązania:
    https://bibliotekanauki.pl/articles/2204542.pdf
    Data publikacji:
    2022
    Wydawca:
    Stowarzyszenie Geomorfologów Polskich
    Tematy:
    późny plejstocen
    zagłębienie bezodpływowe
    warunki peryglacjalne
    maksymalny zasięg lądolodu zlodowacenia Wisły
    Late Pleistocene
    kettle hole
    periglacial conditions
    palaeoenvironmental changes
    maximum limit of the Weichselian (Vistulian) ice sheet
    Opis:
    Odsłonięta w stanowisku Stara Maryśka II sukcesja osadowa obejmuje górną część interglacjału eemskiego po zlodowacenie wisły. Na podstawie ciągłości zapisu palinologicznego w osadach wypełniających zbiornik odtworzony został przebieg zmian klimatu i środowiska w okresie późnego plejstocenu (MIS5e-MIS2). Wyniki datowań metodą OSL pozwoliły wyróżnić okresy funkcjonowania warstwy czynnej wieloletniej zmarzliny podczas zlodowacenia wisły (MIS4- -MIS2), która jest wyznacznikiem warunków peryglacjalnych panujących przed czołem lądolodu. Oznaczony został również czas formowania się wydm w rejonie stanowiska.
    The sedimentary succession exposed in Stara Maryśka II site includes last part of Eemian Interglacial (MIS 5e) to Late Weichselian (MIS2) deposits. On the base of the palynological record in the paleo-lake, the climate and environmental changes during MIS 5e were reconstructed. Optically stimulated luminescence dating of the sands pseudomorphoses of ice wegdes made it possible to distinguish periods of increased aeolian activity during the Weichselian glaciation.
    Źródło:
    Landform Analysis; 2022, 41; 53--68
    1429-799X
    Pojawia się w:
    Landform Analysis
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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