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    Wyświetlanie 1-14 z 14
    Tytuł:
    High-resolution terrestrial archive of climatic oscillations during Oxygen Isotope Stages 5-2 in the loess-palaeosol sequence at Kolodiiv (East Carpathian Foreland, Ukraine)
    Autorzy:
    Łanczont, M.
    Boguckyj, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059498.pdf
    Data publikacji:
    2007
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    East Carpathian Foreland
    last interglacial/glacial period
    loess
    palaeosol
    organic deposits
    Opis:
    The Kolodiiv section is situated in the central part of the East Carpathian Fore land, on the right bank of the Sivka River, the Carpathian tributary of the Dniester River. This paper summarizes investigations on the loess deposit succession representing the Late Pleistocene, which is subdivided by several interstadial palaeosols and is bracketed by the last interglacial soil/organic deposits and Holocene soil. The Kolodiiv loess-palaeosol sequence provides an excellent high-resolution terrestrial archive of changing climate during OIS 5-2 in the East Carpathian Fore land and forms the basis for a regional pedo- and loess stratigraphy. The stratigraphic scheme was constructed on the basis of palaeosol occurrence, lithological variation in the deposits, and also the results of TL dating and palaeomagnetic in vestigations. The exposure at Kolodiiv contains an archaeological site with Middle Palaeolithic materials. Four types of palaeopedological taxa have been distinguished within the loess deposit at Kolodiiv: an interglacial (Eemian) soil unit, which includes one or two soil-forming episodes; interstadial palaeosols, which include two weaker soil-forming episodes; thin interstadial two-horizonpalaeosols; monogenetic incipient palaeosols. Palaeosols from the first and second group form the Horohiv soil unit correlated with OIS 5. Palaeosols from the third and fourth group occur as different soil types within the Dubno 1 and 2 units, which correspond to OIS 3.
    Źródło:
    Geological Quarterly; 2007, 51, 2; 105-126
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Heavy minerals in the key Late Pleistocene loess-palaeosol section at Kolodiiv (East Carpathian Foreland, Ukraine)
    Autorzy:
    Racinowski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059497.pdf
    Data publikacji:
    2007
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Ukraine
    Late Pleistocene
    loess
    palaeosols
    heavy minerals
    Opis:
    Successions of loess and other deposits in the Kolodiiv profile, formed during the Eemian Inter glacial and Vistulian Glacial (OIS 5-2), are characterized using the results of heavy mineral analysis. Weathered local carbonate rocks and fluvial deposits (Wartanian Glacial, OIS 6) are used for comparison. It was found that the content of minerals derived from weathered and redeposited Carpathian Flysch increases from bottom to top of the profile. The entire loess succession accumulated under similar lithodynamic conditions and the palaeosols are of similar character.
    Źródło:
    Geological Quarterly; 2007, 51, 2; 185-188
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mousterian artifacts from the unique Vistulian loess-palaeosol sequence at Kolodiiv (East Carpathian Fore land, Ukraine)
    Autorzy:
    Sytnyk, O.
    Boguckyj, A.
    Łanczont, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059492.pdf
    Data publikacji:
    2007
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Dniester region
    Middle Palaeolithic
    bifacial techniques
    Opis:
    The remains of a Mousterian cultural layer were found on the solifluction horizon at kolodiiv, Ukraine, separating two Early Vistulian palaeosols. The geological position of the finds and the typological characteristics of the assemblage allow us to refer this site to the bifacial techniques of the "East-Micoquian Route of Development".
    Źródło:
    Geological Quarterly; 2007, 51, 2; 189-192
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Palaeomagnetic studies of the loess-palaeosol sequence from the Kolodiiv section (East Carpathian Foreland, Ukraine)
    Autorzy:
    Nawrocki, J.
    Boguckyj, A.
    Łanczont, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059494.pdf
    Data publikacji:
    2007
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Western Ukraine
    Kolodiiv
    loess
    Upper Pleistocene
    palaeomagnetism
    Opis:
    The Upper Pleistocene loess-palaeosol sequence from the Kolodiiv section (East Carpathian Fore land) has been palaeomagnetically studied. Almost all samples displayed moderate to high positive palaeomagnetic inclinations and declinations en closed between 320° and 40°. How ever, one sample from the fossil soil of the last inter glacial pedocomplex (at 16.6 m pro file depth) was reverse magnetized and there fore can be correlated with the Blake Palaeomagnetic Event. Consequently that palaeosol can be related to (Oxygen Isotope Stage) OIS 5e1. An other sample from the Dubno 1 interstadial palaeosol demonstrated southern declination and significant lowering of inclination (up to 40°). This might be a record of the Laschamp Palaeomagnetic Event or of any Late Pleistocene palaeomagnetic excursion. The magnetic susceptibility and anhysteretic remanent magnetization data reflect the presence of several soils forming during the warm conditions of OIS 5 and the complex nature of the Eemian warming. Two palaeosols that developed between ca.115 ka and 120 ka indicate at least two climatic optima during the Eemian. High values of magnetic susceptibility (up to 300 Ą 10-6 SI units) noted in the middle of the section that contains slump deposits (9.5 m to 11m of depth) suggest that this material was derived from older soils of inter glacial type.
    Źródło:
    Geological Quarterly; 2007, 51, 2; 161-166
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    True and anomalous TL dates from Late Pleistocene loess-palaeosol deposits at the Kolodiiv site (East Carpathian Fore land, Ukraine)
    Autorzy:
    Kusiak, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059491.pdf
    Data publikacji:
    2007
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    TL dating
    total-bleach method
    loess
    palaeosols
    Opis:
    Twenty-five samples were selected from the Kolodiiv site (7 profiles) for total-bleach thermoluminescence dating. Only about 50% of the TL ages corresponded well to the age expected on the basis of geological interpretation. The rest of the TL dates are over estimates. The discrepancies between the TL age and the geological age of the deposits probably resulted from the presence of an admixture of poorly bleached material, of local origin, transported over a very short distance.
    Źródło:
    Geological Quarterly; 2007, 51, 2; 167-172
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Palaeoclimate and pedosedimentary reconstruction of a middle to late Pleistocene loess-palaeosol sequence, Prymorske, SW Ukraine
    Autorzy:
    Stephens, Mark
    Krzyszkowski, Dariusz
    Ivchenko, Andriy
    Majewski, Marek
    Powiązania:
    https://bibliotekanauki.pl/articles/2027392.pdf
    Data publikacji:
    2002
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Ukraine
    Quaternary
    loess
    palaeosols
    magnetic susceptibility
    Opis:
    A new investigation and palaeoenvironmental reconstruction of the locss-palaeosol sequence at Prymorskc, SW s q Ukraine is presented using soil structures, grain size, mineral magnetics, organic carbon and calcium carbonate determinations. Six units of the established Ukraine Quaternary stratigraphical scheme have been identified and analysed above and including the Zavadivka (Holsteinian) marker horizon - Dnieper, Kaidaky, Tiasmyn, Pryluky and Udai. Precipitation and temperature are tentatively reconstructed from soil and sedimentary proxies calibrated by modern analogues. Increased temperatures and precipitation to today are inferred for the red-brown Zavadivka palaeosol. Overlying Zavadivka is the Dnieper loess containing a gley and two chernozcms above, possibly representing climatic variations of the Saalian Glaciation. The calcified chernozem Kaidaky is separated by a thin loess from the brown/ chestnut Pryluky palaeosol (Eemian) which has features indicating drier conditions to the present. Non-gleyed palaeosols exhibit an enhanced magnetic susceptibility (MS) signal relative to the less weathered loess and highlights the palaeoclimatic potential of the technique. The most well developed palaeosol from this study has the highest MS value (Zavadivka: 80-1 o·8 SJ units) but this relationship is not always found in the Black Sea region. Previous MS analyses at Prymorske (Nawrocki et al. 1999) report significantly higher values to those of this study. Consequently the MS curve at Prymorske cannot be used with confidence for palaeoenvironmental reconstruction and inter-regional correlation without further investigation and modern analogue study.
    Źródło:
    Studia Quaternaria; 2002; 3-17
    1641-5558
    2300-0384
    Pojawia się w:
    Studia Quaternaria
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Vistulian litho- and pedosedimentary cycles recorded in the Kolodiiv loess-palaeosol sequence (East Carpathian Foreland, Ukraine) determined by laser grain-size analysis
    Autorzy:
    Frankowski, Z.
    Łanczont, M.
    Boguckyj, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059502.pdf
    Data publikacji:
    2007
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    loess
    palaeosols
    grain size
    statistical indices
    Opis:
    In the Kolodiiv site, occur ring in the valley of the Sivka River (tributary of the Dniester River, Ukraine), Vistulian loess forms a subaerial cover over the Pleistocene terrace II. This terrace consists also of Eemian deposits (palaeosol or organic sediments) under lain by an alluvial succession of Wartanian age. The Kolodiiv 2 profile was studied in detail in order to reconstruct the conditions of loess accumulation, and consequently the climatic-environmental changes, that took place in this region. Eight lithogenetic units were distinguished in the profile: five trans formed by pedogenesis, and three loess beds. The main purpose of this study was to conduct a thorough examination of the units lithology, in particular the grain-size distribution, in order to investigate those loess-forming factors that are influenced by environmental changes (i.e. nature of source material, distance and dynamics of transport, type of deposition and redeposition, and hypergenetic processes). To achieve this, 174 samples were taken at 10 cm spacings along the profile, and the grain-size distributions of the deposits were determined using a laser method with 21 grain-size intervals examined in each sample and statistically analyses. Statistical analysis included: calculation of the main grain-size parameters (according to Folk and Ward's method), grain-size index (Ding etal., 1994) and also two statistical tests (Kolmogorov-Smirnov and Spearman rank correlation) applied in order to find differences or similarities between the grain-size distributions of the lithogenetic units distinguished. Stratigraphic variations in grain-size distribution reflect the division of the deposits into stratigraphic units previously arrived at. Mean values of grain-size index (Igs1) indicate that loess units 2, 4 and 6, differ from the palaeosol units 3, 5 and 7. The grain-size distribution of loess deposits in the Kolodiiv 2 profile varies, with marked dominance of the silt fraction, which indicates that these deposits were trans ported by winds of similar velocities carrying material a short distance from source. As the Aeolian conditions that formed loess deposits in the Kolodiiv 2 profile were generally stable, differences in the grain-size distribution of unit 2 representing the Upper Pleniglacial, suggest three cycles of loess deposition during that interval (with the middle cycle characterized by the most distinct, short-term oscillations in environmental dynamics). The variability in grain-size distribution in units 3-5, which to get her represent the Interplenivistulian (Middle Pleniglacial), reflects the climatic heterogeneity of this period. The palaeosol layers are diamictic. Higher values of grain-size indices show that all Upper Pleistocene palaeosol units of high (interglacial) and low (interstadial) rank are characterized by higher content of fine relative to coarse fraction the lowest mean values of grain-size index occur the soil unit 1, of Holocene age, suggests that this unit is probably a product of very recent, Neoholocene pedogenesis and does not represent the en tire Holocene epoch. The statistical tests results show, great similarity between loess units 2 and 4 (from the middle and upper part of the Pleniglacial), and also between palaeosol units 7 and 8 forming the Horohiv slpalaeosol unit (an Eemian palaeosol and interstadial palaeosols from the Early Vistulian). Further more, the individual nature of loess unit 6, deposited during the Lower Pleniglacial, seems to be associated with the climatic characteristics of this interval.
    Źródło:
    Geological Quarterly; 2007, 51, 2; 147-160
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stratygraficzne i przestrzenne aspekty zróżnicowania składu chemicznego późnoplejstoceńskich sekwencji lessowo-glebowych w Polsce – przykłady profili w Tyszowcach i Białym Kościele
    The stratigraphic and spatial aspects of the differentiation of the chemical composition of the Late Pleistocene loess-palaeosol sequences in Poland – a case study of the Tyszowce and Biały Kościół profiles
    Autorzy:
    Skurzyński, Jacek
    Jary, Zdzisław
    Raczyk, Jerzy
    Moska, Piotr
    Krawczyk, Marcin
    Powiązania:
    https://bibliotekanauki.pl/articles/578343.pdf
    Data publikacji:
    2017
    Wydawca:
    Łódzkie Towarzystwo Naukowe
    Tematy:
    less,
    gleba kopalna
    geochemia
    wskaźniki wietrzeniowe
    metoda chemostratygraficzna
    loess
    palaeosol
    geochemistry
    weathering indices
    chemostratigraphic method
    Opis:
    Artykuł prezentuje porównanie składu geochemicznego i stopnia zwietrzenia chemicznego dwóch późnoplejstoceńskich sekwencji lessowo-glebowych, zlokalizowanych w SE i SW Polsce. Analiza chemiczna w zakresie pierwiastków głównych (Si, Al, Fe, Mn, Mg, Ca, Na, K, Ti, P) oraz wyliczonych na ich podstawie wskaźników (CIA, Ti/Al, K/Al, Mg/Ca, K/Ca, Na/K oraz Si/Al) wykazała, że obie sekwencje są zróżnicowane zarówno w ujęciu stratygraficznym, jak i przestrzennym. Zmienność stratygraficzna związana jest ze zmianami paleoklimatu warunkującymi natężenie zarówno procesów lito-, jak i pedogenezy. Zmienność przestrzenna może wynikać m.in. z odmiennych warunków klimatycznych w trakcie tworzenia się sekwencji lessowo-glebowych, recyklingu lessów lub nawet odmiennego źródła materiału. Istotna może być też dysproporcja miąższości sekwencji, skutkująca zróżnicowanym wpływem infiltracji wód opadowych.
    The article presents the comparison of the geochemical composition and the degree of chemical weathering between two Late Pleistocene loess-palaeosol sequences of SE and SW Poland. The results of major element (Si, Al, Fe, Mn, Mg, Ca, Na, K, Ti, P) and geochemical index (CIA, Ti/Al, K/Al, Mg/Ca, K/Ca, Na/K oraz Si/Al) analyses indicate stratigraphical and spatial differentiation between sequences. The stratigraphic differentiation is connected with palaeoclimatic conditions which control the intensity of pedogenesis. The spatial variability may be attributed to different climatic conditions during the deposition of loess, the loess recycling process, or even to different source areas. The disproportion between the thicknesses of the loess covers can also be important. It can affect the rainwater infiltration effect.
    Źródło:
    Acta Geographica Lodziensia; 2017, 106; 87-103
    0065-1249
    Pojawia się w:
    Acta Geographica Lodziensia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetostratigraphy and magnetic susceptibility of the best developed Pleistocene loess-palaeosol sequences of Ukraine : implications for correlation and proposed chronostratigraphic models
    Autorzy:
    Hlavatskyi, Dmytro V.
    Bakhmutov, Vladimir G.
    Powiązania:
    https://bibliotekanauki.pl/articles/2060251.pdf
    Data publikacji:
    2020
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Pleistocene
    loess
    magnetostratigraphy
    magnetic susceptibility
    Matuyama-Brunhes boundary
    Ukraine
    Opis:
    We provide a revised magnetostratigraphy and magnetic susceptibility stratigraphy of the most complete and thickest (to nearly 60 m) loess-palaeosol sequences in Ukraine spanning the past 1 My: the Roksolany (Black Sea Lowland) and Vyazivok (Dnieper Lowland) sections. The Matuyama-Brunhes boundary has been detected in both sequences in stratigraphically different palaeosol units according to current regional chronostratigraphic schemes. Hypotheses of a large magnetic lock-in depth at Vyazivok and lithostratigraphic incompleteness at Roksolany do not resolve this inconsistency. Instead, new chronostratigraphic models following the Chinese loess designation system, which are supported by correlation of the magnetic susceptibility records with the marine isotope record and estabilished magnetostratigraphic control points, are proposed. We conclude that the Matuyama-Brunhes reversal in the Roksolany and Vyazivok sections belongs to the same palaeosol unit, the Shyrokyne (according to our nomenclature, the U-S7), which corresponds to MIS 19. This novel interpretation resolves the inconsistency of the stratigraphic position of the Matuyama-Brunhes boundary in Ukrainian loess, ends long-standing debate regarding the chronostratigraphy of the Roksolany section, and allows precise correlation of the most representative loess-palaeosol sequences of Ukraine with those in the Danube Basin and the Chinese Loess Plateau. It is considered that the Roksolany Tephra in MIS 6 loess unit can be related to the L2 Tephra which is widely distributed in southeastern European loess records and lacustrine archives. In the light of our results, the Roksolany sequence may serve as a national lectostratotype of the Middle Zavadivka (U-L4) loess unit corresponding to MIS 10. Additionally, a generalized pedostratigraphic column of the past 1 My for central and southern Ukraine has been constructed and correlated with the Hungarian, Serbian and Chinese loess stratigraphies, as well as with the marine isotope record down to MIS 25.
    Źródło:
    Geological Quarterly; 2020, 64, 3; 723--753
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Luminescence dating of the Volochysk section : a key Podolian loess site (Ukraine)
    Autorzy:
    Fedorowicz, S.
    Łanczont, M.
    Mroczek, P.
    Bogucki, A.
    Standzikowski, K.
    Moska, P.
    Kusiak, J.
    Bluszcz, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2060446.pdf
    Data publikacji:
    2018
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    loess-palaeosol sequence
    luminescence dating
    quartz
    polymineral fractions
    Podolia
    Opis:
    The Volochysk site belongs to important and unique loess sites in the Podolia Upland (W Ukraine) because it contains relatively well-developed loess deposits representing the last and penultimate glacial cycles. This loess-palaeosol sequence consists of pedocomplex S1 (MIS 5) developed on loess L2, and loess L1 (MIS 4-2) with the palaeosols of lower, interstadial rank. In this sequence, different periglacial structures were found, including the largest ones of ice-wedge cast type. Different quartz and polymineral fractions separated from the samples collected in the Volochysk site were dated using luminescence methods (SAR OSL, post-IR IRSL and TL) in three Polish luminescence laboratories in Gdańsk, Gliwice and Lublin. In total, 69 luminescence dating results were obtained for 18 samples. The methodological and research aims were to carry out mutual verification of the obtained dating results as well as to analyse and interpret the differences between them, and to determine the age of distinguished deposit layers and the period of cryogenic activities. The luminescence dates of the sediments, which were deposited during MIS 2, 3 and 4, corresponded fairly well to the ages attributed to these stages. They also indicate the age of periglacial phenomena. However, the TL dates were generally older than the OSL ones, especially those obtained for the sediments deposited during MIS 5 and 6. The results of the research of the Volochysk sequence were compared with those obtained in past years for the loess deposits of the Volhynian Upland (north of Podolia) during similar inter-laboratory analyses conducted to determine their age. The results of OSL datings of the older deposits (MIS 5 and MIS 6) are underestimated irrespective of the used method, and the type (quartz, polymineral) and size of grains. Numerous attempts were made to explain this phenomenon, which, however, give no answer. It was only found that this underestimation corresponded to the equivalent dose value of ~150 Gy.
    Źródło:
    Geological Quarterly; 2018, 62, 3; 729--744
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Middle and Late Pleistocene loess-palaeosol archives in East Croatia: multi-proxy palaeoecological studies on Zmajevac and Šarengrad II sequences
    Autorzy:
    Molnár, Dávid
    Makó, László
    Cseh, Péter
    Sümegi, Pál
    Fekete, István
    Galović, Lidija
    Powiązania:
    https://bibliotekanauki.pl/articles/2025053.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    palaeoecology
    malacology
    sedimentology
    Šarengrad
    Zmajevac
    Croatia
    Opis:
    Multi-proxy palaeoenvironmental analyses on the two loess-palaeosol sequences of Šarengrad II and Zmajevac (Croatia) provided the opportunity to obtain various data on climatic and environmental events that occurred in the southern part of the Carpathian Basin during the past 350,000 years. Palaeoecological horizons were reconstructed using sedimentological data (organic matter and carbonate content, grain-size distribution and magnetic susceptibility) and the dominance-based malacological results (MZs) supported by habitat and richness charts, moreover multi-variate statistics (cluster analysis). The correlation of the reconstructed palaeoecological horizons with global climatic trends (Marine Isotope Stages) determined the main accumulation processes in the examined areas. The palaeoecological analyses revealed specific accumulation conditions at both sequences, fluvial and aeolian environments at Šarengrad and a possible forest refuge at Zmajevac.
    Źródło:
    Studia Quaternaria; 2021, 38, 1; 3-17
    1641-5558
    2300-0384
    Pojawia się w:
    Studia Quaternaria
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stratigraphic interpretation of loess in the marginal zone of the Dnieper I ice sheet and the evolution of its landscape after deglaciation (Dnieper Upland, Ukraine)
    Autorzy:
    Komar, M.
    Łanczont, M.
    Fedorowicz, S.
    Gozhik, P.
    Mroczek, P.
    Bogucki, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2060425.pdf
    Data publikacji:
    2018
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    loess
    palaeosol
    Dnieper
    Pleistocene
    palaeogeography
    palynology
    luminescence dating
    Opis:
    Litho-, pedo- and palynological analyses constrained by radiometric dating of two loess-palaeosol sequences, Nahirne and Velyka Andrusivka, exposed in a cliff at the eastern edge of the Dnieper Upland, Ukraine, document regional environmental changes in the western marginal zone of the Dnieper lobe. The postglacial loess sedimentation cycle was initiated during MIS 8, immediately after the ice sheet recession. On the basis of palaeorelief analysis, subsequent morphogenetic stages of the original postglacial relief, associated with the modifying and masking role of the loess, and destructive slope processes were reconstructed. Periglacial steppe with consistently present scattered trees formed the Pleistocene landscape in the Middle Dniester area during the last three glacial periods. In such an environment, the following loess beds, correlated with marine isotope stages (MIS), were deposited: Dnieper (dn) - MIS 8, Tyasmyn (ts) - MIS 6, Uday (ud) - MIS 4 and Bug (bg) - MIS 2. During the last two warm periods: Kaydaky (kd) - MIS 7 and Pryluky (pl) - MIS 5, the landscape was not fully forested. As a result, the individual palynological features of these soils show a diverse character. The TL and OSL dates form a sequence with numerous inversions that are difficult to interpret. Although these data do not significantly influence the interpretation, they show that: 1) there are loesses that undoubtedly formed after the maximum extent of the ice sheet by short-distance transport of dust material from local fresh glacial deposits and the underlying Paleogene rocks; 2) date distortions result from the activities of an exceptionally rich pedofauna that has contaminated the material not only in the soil sections of the profile but also in the adjacent loess. It is possible to delimit a few stages of pedofaunal activity in each of the soil units.
    Źródło:
    Geological Quarterly; 2018, 62, 3; 536--552
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    U-Th ages and facies properties of Edremit travertines and tufas, Van, Eastern Anatolia : implications for the neotectonics of the region
    Autorzy:
    Yeşilova, Çetin
    Güngör Yeşilova, Pelin
    Açlan, Mustafa
    Yu, Tsai-Luen
    Shen, Chuan-Chou
    Powiązania:
    https://bibliotekanauki.pl/articles/2059601.pdf
    Data publikacji:
    2021
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    palaeosol
    travertine facieses
    Van Fault
    tufa
    growth rate
    Lake Van
    Opis:
    Travertine formation is one of the most important archives of active tectonics in a region and provides information about climate, water temperature and quantity, and biological activity. The Edremit travertines and tufas extend over nearly160 km2 within the boundaries of the Edremit area to the east of Lake Van (eastern Turkey), and yield important evidence towards understanding the neotectonics of the region. The Edremit travertines and tufas were studied throughout their full stratigraphic extent, the factors controlling the formation of these deposits were examined, and the succession was sampled for U/Th analysis. Travertine formation was found to occur from 542–29.7 ka, with two different tufa formation periods: from 29.7–5.8 ka and 5.8–2.08 ka. Pauses in travertine formation (palaeosols) were identified from 510–470 ka, 289–269 ka and 91–34 ka. Our study showed that climate parameters affected the formation of tufa, while the Edremit travertines developed under the control of tectonism. The Van Fault is directly associated with travertine development and its age was identified as 542 ka or older. Since the Gürpιnar Fault, one of the most important faults in the region, is effective in shaping the southern slope of the travertines and limiting the movement of the Van Fault, its age should be younger than 542.4 ka. The Elmalιk Fault played an active role in the formation of the Edremit tufas and is proposed to be 29.7 ka in age, from stratigraphic relationships in the region.
    Źródło:
    Geological Quarterly; 2021, 65, 2; 65: 28
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Radiometric dating of the Ootun palaeosol and its implication for the age of the Shifting Sand in Ngorongoro Lengai Geopark (Arusha, Tanzania)
    Autorzy:
    Makongoro, Mohamed Zengo
    Vegi, Maheswara Rao
    Vuai, Said Ali Hamad
    Msabi, Michael Mwita
    Powiązania:
    https://bibliotekanauki.pl/articles/2204367.pdf
    Data publikacji:
    2022
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    Oldoinyo Lengai volcano
    ash dunes
    tephra dunes
    carbon-14 dating
    UNESCO Global Geopark
    wulkan Oldoinyo Lengai
    wydmy
    datowanie radiowęglowe
    Światowy Geopark UNESCO
    Tanzania
    Opis:
    The Shifting Sand is a barchan dune in Ngorongoro Lengai Geopark in Arusha, Tanzania. The geopark, a UNESCO World Heritage Site, is protected by the Ngorongoro Conservation Area Authority. The dune ranks amongst the main geosites that have been attracting numerous tourists; it formed as a result of volcanic ash eruptions that led to tephra deposition on a palaeosol (palaeosurface) in the Ootun area. The easterly winds modified the ash into dunes and headed to the Olduvai Gorge area. The age of the Shifting Sand dune is not known in detail. In the present study, we employ the radiocarbon (14C) dating method to date a subsurface palaeosol bed in the Ootun area where the tephra (i.e., original Shifting Sand materials) was originally deposited. An Accelerator Mass Spectrometer was used to determine the carbon-14 date of the palaeosol so as to estimate the age of the Shifting Sand dune, and an Energy Dispersive X-ray Fluorescent Spectrometer to determine the chemical composition of the Shifting Sand material and the tephra bed for correlative purposes. A radiocarbon (14C) date of 2510 ± 30 years BP for the Ootun palaeosol was obtained to estimate the minimum age of the Ootun subsurface tephra deposited in the area; since then, this started to move westwards towards the Olduvai Gorge area, where it is today defined as the Shifting Sand. The current findings add educational value to the Shifting Sand in Ngorongoro Lengai Geopark and improve our understanding of the eruption history of the Gregory Rift volcanoes.
    Źródło:
    Geologos; 2022, 28, 3; 203--215
    1426-8981
    2080-6574
    Pojawia się w:
    Geologos
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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