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    Wyświetlanie 1-4 z 4
    Tytuł:
    Unique siderite occurrence in Baltic Sea: a clue to siderite-water oxygen isotope fractionation at low temperatures
    Autorzy:
    Hałas, S.
    Chlebowski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2058799.pdf
    Data publikacji:
    2004
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Baltic Sea
    siderite
    oxygen isotopes
    isotope equilibrium
    low temperatures
    water
    Opis:
    electron microprobe (determination of major cation content) and mass spectrometry (delta13 C and delta18 O analysis). The siderite was interpreted as having formed from metallic iron partly protected from free oxygen access by wood tar with delta13 C = -24 0/00 and from biogenic CO2 produced from this organic matter. Inasmuch as the siderite has highly positive delta3 C values ranging from 8.05 to 15.41 0/00, we deduced that extremely isotopically heavy CO2 was generated in the process of biogenic decomposition of the organic matter. It was found that the delta18 O values of siderite (26.58 to 27.74‰ vs. VSMOW) fit very well to the recalculated curve of Becker (1971) [formula] and to published extrapolated experimental data.
    Źródło:
    Geological Quarterly; 2004, 48, 4; 317--322
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Derived marine microfossils in loesses of the last glaciation and their significance in the reconstruction of loess-forming processes in central-eastern Europe
    Autorzy:
    Paruch-Kulczycka, J.
    Chlebowski, R.
    Lindner, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059186.pdf
    Data publikacji:
    2003
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    southern Poland
    Ukraine
    Maastrichtian
    foraminifers
    coccoliths
    calcareous dinocysts
    loess
    last glaciation
    Opis:
    Documented examples of type sections with Pleistocene deposits in southern Poland (Tłumaczów, Branice, Wożuczyn, Tyszowce, Hrubieszów) and southwestern Ukraine (Bojanice, Horokhov, Zhorniv) indicate that loesses of the last glaciation (Vistulian, Valdayan) contain derived marine microfossils of Cretaceous age. The microfossil assemblages studied are richly represented by foraminifers, which are mostly well-preserved, and derived mainly Cretaceous, forms. Suitable Late Cretaceous exposures are nearby, around data shows that these rocks and their debris, and the overlying Pleistocene tills and sands, which are older than the loesses, represent one of the main sources of the loess silt. This fact and the heavy mineral content are evidence of the participation of local material in loess-forming processes in central-eastern Europe. The spatial distribution of the sections studied in relation to the determined sources of loess material indicate that the accumulation of the loesses took place mainly in the presence of western and/or northwestern winds in the lower parts of the atmosphere.
    Źródło:
    Geological Quarterly; 2003, 47, 2; 119-132
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stratigraphy and sedimentology of the Bug loess (Pleistocene: Upper Vistulian) between Kiev and Odessa (Ukraine)
    Autorzy:
    Chlebowski, R.
    Gozhik, P.
    Lindner, L.
    Łanczont, M.
    Wojtanowicz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2058875.pdf
    Data publikacji:
    2003
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Ukraine
    Kiev–Odessa area
    alimentation areas
    heavy minerals
    last glaciation
    loess
    Opis:
    Documented type sections (Vyazivok, Stayky, Uman, Troitskoye, Altestovo, Roxolany and Lebedivka) provide a basis for Pleistocene stratigraphy between Kiev and Odessa, and have been used to characterise the heavy mineral composition and part of the light fraction of the Bug loess in this area. These sections document an almost complete succession of climatic change during the last 780 ka, worked out mostly using loesses and palaeosols though also in the case of the first two sections, of glacial deposits. The heavy mineral composition of the Bug loess in these sections documents five mineral groups on the basis of their resistance to weathering and susceptibility to deflation and aeolian transport. Radar charts with particular mineral groups indicate mineralogical and genetic trends in the loesses. Moreover, in some sections the light fraction of the loess investigated contains derived microfossils (mainly foraminifers) of Cretaceous age, indicating source areas for the loess-forming material, and constraining the palaeowind directions. The data obtained allow distinction of three accumulation zones of the Bug loess in this area, reflecting loesses derived from different source areas and transported by winds from different directions. In northern sections (zone A), the Bug loess was accumulated by winds blowing from the west and north-west. More to the south (zone C), the same loess was accumulated by winds from the east and south-east. Loess preserved in zone B, between these areas, could be accumulated by winds from either of these directions.
    Źródło:
    Geological Quarterly; 2003, 47, 3; 261-268
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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