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    Wyświetlanie 1-5 z 5
    Tytuł:
    Late Pleistocene vegetational and soil evolution at the Kiev loess plain as recorded in the Stari Bezradychy section, Ukraine
    Autorzy:
    Gerasimenko, Natalia G.
    Powiązania:
    https://bibliotekanauki.pl/articles/2026769.pdf
    Data publikacji:
    2000
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Pleistocene
    paleosol
    loess
    pollen
    Ukraine
    Opis:
    Pollen and palcopedological studies have been carried out in parallel for the Stari Bezradychy sequence of the Upper Pleistocene age. The paleoenvironmental information derived from both sets of data is in general well correlated. The section presents a rather complete sequence of the last interglacial-glacial cycle. It includes eight units of the Ukrainian Stratigraphical Framework of the Pleistocene. Interglacial climatic optimum is registered by pollen succession of the Mikulino (Ecmian) type in the climax forest palcosols of Pryluky-Kaydaky pedocomplcx at the base of the sequence, above the Dnieper Glacial deposits. The coldest and most continental environment is recorded in the youngest loess. The soils of Upper Pryluky, Yytachiv and Dofinivka units are correlated with the Early Glacial and four Plcniglacial interstadials. Multiple environmental variations during the Upper Pleistocene recorded in the Stari Bezradychy sequence arc important for study of global climatic changes and interregional correlation. Tentative correlation with marine isotopic stages is proposed.
    Źródło:
    Studia Quaternaria; 2000, 17; 19-28
    1641-5558
    2300-0384
    Pojawia się w:
    Studia Quaternaria
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Late Pleistocene loess-paleosol and vegetation successions at Tarnawce (San River valley, Carpathians foothills, Poland)
    Autorzy:
    Komar, Maryna
    Łanczont, Maria
    Powiązania:
    https://bibliotekanauki.pl/articles/2027418.pdf
    Data publikacji:
    2002
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Late Pleistocene
    paleosol
    loess
    pollen
    Carpathian Foothills
    Opis:
    The Tarnawce I profile, which occurs in the marginal eastern part of the Polish Westem Carpathians, contains loesses sq representing three last glacial cycles. In this paper we report the results of pollen analysis of the Eemian-Early Glacial pedocomplex and of the Lower plcni-Visrulian loesses with an interstadiał paleosol. The pollen spectra of22 samples were determined. The pollen diagram was divided into 7 local pollen assemblage zones (L PAZ). Interglacial climatic optimum was recorded with the Eemian type of vegetation in the T-4 zone. The coldest conditions occurred during the accumulation of loess, which separates the interglacial and interstadiał soils.
    Źródło:
    Studia Quaternaria; 2002; 27-35
    1641-5558
    2300-0384
    Pojawia się w:
    Studia Quaternaria
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Skład chemiczny wód porowych górnoplejstoceńskiej sekwencji lessowo-glebowej w Zaprężynie (SW Polska)
    Pore water chemical composition of the Upper Pleistocene loess-paleosol sequence in Zaprężyn (SW Poland)
    Autorzy:
    Skurzyński, J.
    Modelska, M.
    Raczyk, J.
    Staśko, S.
    Jary, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/2075648.pdf
    Data publikacji:
    2017
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    wody porowe
    less
    profil glebowy
    skład chemiczny
    pore water
    loess
    paleosol
    chemical composition
    Opis:
    The article presents the preliminary results of pore-water chemistry studies of the entire Upper Pleistocene loess-paleosol sequence in Zaprężyn (SW Poland). The pore-water chemical composition provides information about behaviour of the elements in the loess profile during the rock-water interactions. The applied method of ex situ water extraction allows only obtaining slightly bound water, which determines physicochemical parameters of the ground. The considerable variability of the values of pH, EC and concentrations of Al3+, Fe3+, Mn2+, Mg2+, Ca2+, Na+, K+, SO42-, Cl- ions and SiO2 was caused by stratification of sediments. The effect of reduced-permeability barrier on the increased concentrations of some ions was also found.
    Źródło:
    Przegląd Geologiczny; 2017, 65, 11/2; 1383--1387
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Priabonian, late Eocene chronostratigraphy, depositional environment, and paleosol-trace fossil associations, Pipestone Springs, southwest Montana, USA
    Autorzy:
    Hanneman, Debra L.
    Lofgren, Donald
    Hasiotis, Stephen T.
    McIntosh, William C.
    Powiązania:
    https://bibliotekanauki.pl/articles/2216267.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Trace fossils
    Coprinisphaera
    Eatonichnus
    Feoichnus
    Fictovichnus
    Rebuffoichnus
    continental strata
    paleosol
    vertisol
    alfisol
    inceptisol
    loessite
    Chadronian
    Priabonian
    Renova Formation
    Montana
    Opis:
    Sanidine 40Ar/ 39Ar ages of lapilli tuffs and the mammalian fauna of Pipestone Springs strata provide a high-resolution chronostratigraphy for upper Eocene (Priabonian) rock units in southwestern Montana. Two felsic lapilli tuffs with weighted-mean 40Ar/ 39Ar single crystal sanidine ages of 37.50±0.02 Ma and 36.00±0.20 Ma both fall within the Priabonian, late Eocene. These tuffs occur within the basal to upper part of the 55 m of exposed Pipestone Springs strata. The uppermost 15 m yield a diverse and abundant assemblage of mostly small-bodied middle Chadronian (Priabonian, late Eocene) mammals. The older lapilli tuff is an ashfall tuff, whereas the younger lapilli tuff exhibits minor aeolian reworking. The new 40Ar/ 39Ar age constraints significantly increase the age range of Pipestone Springs strata to include uppermost Duchesnean–lowermost Chadronian (Priabonian, upper Eocene) deposits in addition to its well-known mid- dle Chadronian vertebrate assemblage. These new 40 Ar/39Ar ages combined with its mammalian fauna further support Pipestone Springs strata as age-correlative to the Flagstaff Rim section in central Wyoming, and provide a basis for better determining late Eocene mammalian paleogeography and regional paleolandscapes in the United States Rocky Mountain to Great Plains areas. Loessites intercalated with paleosols dominate Pipestone Springs deposits. The recognition of loessites comprising these strata is a new depositional interpretation of Pipestone Springs strata, making these loessites some of the oldest known aeolian Eocene strata in the Great Plains–Rocky Mountains region. Pipestone Springs paleosols developed on lapilli tuffs are vertisols. Alfisols and inceptisols, developed from a parent material of volcanic glass mixed with non-volcanic grains, are the remaining paleosols within the loessite strata. Additionally, a new and important discovery in this project is the recognition that all paleosols are extensively bioturbated, containing trace fossils similar to Rebuffoichnus and newly identified trace fossils resembling Feoichnus, Eatonichnus, Fictovichnus, and Coprinisphaera.
    Źródło:
    Acta Palaeontologica Polonica; 2022, 67, 1; 5-20
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cosmic Airburst on Developing Allerød Substrates (Soils) in the Western Alps, Mt. Viso Area
    Autorzy:
    Mahaney, William C.
    West, Allen
    Milan, Alison
    Krinsley, David H.
    Somelar, Peeter
    Schwartz, Stephane
    Milner, Michael W.
    Allen, Christopher C.R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2025231.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Black Mat impact/airburst
    Reconstructed soil at time of YDB
    mid-LG-YD paleosol Sedimentary products of cosmic impact/glacial recession
    Nauki o Ziemi
    Opis:
    Although much has been written about a cosmic impact event in the Western Alps of the Mt. Viso area, the event closely tied with the Younger Dryas Boundary (YDB) of 12.8 ka and onset of the Younger Dryas (YD), the affected land surface is considered to contain a similar black mat suite of sediment found on three continents. While work elsewhere has focused on recovered sediment from lake and ice cores, buried lacustrine/alluvial records, and surface glacial and paraglacial records, no one has traced a mountain morphosequence of deposits with the objective of investigating initial weathering/ soil morphogenesis that occurred in ice recessional deposits up to the YDB when the surface was subjected to intense heat, presumably, as hypothesized by Mahaney et al. (2016a) from a cosmic airburst. With the land surface rapidly free of ice following glacial retreat during the Bølling-Allerød interstadial, weathering processes ~13.5 to 12.8 ka led to weathering and soil morphogenesis in a slow progression as the land surface became free of ice. To determine the exposed land character in the mid- to late-Allerød, it is possible to utilize an inverted stratigraphic soil morphogenesis working backward in time, from known post-Little Ice Age (LIA) (i.e. time-zero) through LIA (~0.45 to ~0.10 ka), to at least the middle Neoglacial (~2 ka), to answer several questions. What were the likely soil profile states in existence at the end of the Allerød just prior to the cosmic impact/airburst (YDB)? Assuming these immature weathered regolith sections of the Late Allerød approximated the <1 ka old profiles seen today, and assuming the land surface was subjected to a hypothesized instant temperature burst from ambient to ~2200oC at ~12.8 ka, what would be the expected effect on the resident sediment? To test the mid-LG (YDB) to YD relationship we analyzed the paleosols in both suites of deposits – mid-LG to YD – to test that the airburst grains are restricted to Late Allerød paleosols and using relative-age-determination criteria, that the overlapping YD to mid-LG moraines are closely related in time. These are some of the questions about the black mat that we seek to answer with reference to sites in the upper Guil and Po rivers of the Mt. Viso area.
    Źródło:
    Studia Quaternaria; 2018, 35; 3-23
    1641-5558
    2300-0384
    Pojawia się w:
    Studia Quaternaria
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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