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    Wyświetlanie 1-5 z 5
    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:
    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:
    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
      Wyświetlanie 1-5 z 5

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