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    Wyświetlanie 1-3 z 3
    Tytuł:
    Middle pleistocene stratigraphy in the light of data from the vilkiskes site, eastern Lithuania
    Autorzy:
    Satkunas, J.
    Molodkov, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1186131.pdf
    Data publikacji:
    2005
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    lacustrine sedimentation
    sandy deposits
    OSL dating
    Drenthe-Warthe Interstadial
    Vilkiskes ice free interval
    Quaternary
    eastern Lithuania
    Opis:
    The Vilkiskes outcrop is approximately 40 metres high section of Quaternary sandy sediments, exposed in the slope of the Neris River valley and is located 15 km upstream from the city of Vilnius. The section is composed mainly of sand with one till layer in the middle part. The outcrop is of particular interest due to typical section of sandy formation presumably of lacustrine origin, occurring under the till. This formation is widely distributed in the vast area in between Vilnius city and Nemencine town, according to the data of geological mapping, and represents a particular period of nonglacial sedimentation of Saalian time. The new optically stimulated luminescence (OSL) dates (determined by A. Molodkov), obtained from the Vilkiskes section, fall into the time span of 307-230 and 147-137 ka. The age of the lower part of Vilkiskes lacustrine section (dated 307-230 ka by OSL) looks closest to the two ice free stages, which can be correlated with oxygen isotope stages (OIS) 7 (236-186 ka) and OIS 9 (328-301 ka). Ages of about 147.1 and 136.7 ka are obtained near the immediate contact with the underlying glacial lithocomplex. Assuming OSL ages, conditions of occurrence and palaeopalynological characteristics, the interval of the Vilkiskes outcrop with OSL dates falling into the time span 236-186 ka (OIS 7) can be introduced as the last Middle Pleistocene (Drenthe-Warthe) ice free interval in Lithuania, most probably, separating the Zemaitija and Medininkai stadials. The interval dated 147.1 and 136.7 ka is interpreted as the Pamarys Interstadial that tentatively can be correlated with the Zeifen Interstadial in the Kattegat Depression suggesting the existence of a ?Younger Dryas?-type climate oscillation just prior to the OIS 6/5e boundary.
    Źródło:
    Polish Geological Institute Special Papers; 2005, 16; 94--102
    1507-9791
    Pojawia się w:
    Polish Geological Institute Special Papers
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Osady eoliczne (wydmowe) w suchym i półsuchym regionie płaskowyżu Alashan (MongoliaWewnętrzna, Chiny)
    Aeolian (dune) deposits in arid to semi-arid region of the Alashan Plateau (Inner Mongolia, China)
    Autorzy:
    Kenig, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/2074941.pdf
    Data publikacji:
    2012
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    osady eoliczne
    megadunes
    obszary pustynne
    regiony źródłowe
    kierunek wiatru
    Pustynia Alashan
    Hunshandake
    Chiny
    aeolian deposits
    megadiunes
    sandy lands
    source regions
    wind directions
    Alashan Desert
    China
    Opis:
    In northern China, sandy and rocky deserts are located in arid regions west of the Helan Mountains (Helan Shan), while the areas of fixed sand dunes stretch in semi-arid regions east of the Helan Mountains. Helan Mountains, trending nearly NS in the northern part of China's Inner Mongolia Autonomous Region, are a natural border between the dry climate to the west and the semi-dry climate to the east. In the Badain Jaran Desert (part of the Alashan Desert), there are the largest dunes in China, and possibly the largest in the world. They attain a height of up to 460 m in the southeastern part of the desert. Due to their size, they are called megadunes by the Chinese researchers. They are accompanied by numerous smaller dunes, developed in various forms, which cover their slopes. As a result, megadune complexes form, reaching 10 km in length. The general direction of the dunes is NE-SW. In their lower parts, they are covered with sparse xerophytic vegetation, mainly Artemisia and Ephedra. In interdunal depressions of the Badain Jaran Desert, there are numerous (140) permanent, relatively shallow and drying-up lakes, overgrowing with vegetation. Their average depths are 2 m, rarely reaching 16 m mainly in the northern part. The water in the lakes is highly alkaline, with pH values of up to 10.5. Sometimes, the accumulation of salt is so substantial that allows it to be extracted. The groundwater in the immediate surroundings of dunes shows a much lower alkalinity and the average pH is 7.8. To the east of the Helan Mountains, there are several deserts of generally smaller areas and specific environmental nature. This is a sandy land of Hunshandake. Dunes and dune fields are lower and less well developed morphologically, reaching an average of 5-10 m in height. They are mostly stabilized completely or partially by vegetation. The main trend of dunes here is WNW-ESE. Locally, shallow lakes occur in interdunal areas. Studies of mineral and chemical composition of silt material are important for the considerations of the source and direction of silt transport in Asia. One of the diagnostic components of detrital minerals is dolomite. The newest studies of silts recently deposited in Beijing provide information about the wind-transportation direction. It appears that there is a fundamental difference in the mineral composition of silts originating from the dust storm (in 2006) and silts from the entire spring period. Such conclusions are also confirmed by the content of rare earths elements in the 2006 dust storm sediments from Beijing and, comparatively, from other deserts as potential source areas of silts (Yang et al., 2007b). Isotopic investigations of Nd and Sr in aeolian sediments of northern China confirm such a possibility. An important problem for the areas located in northern China is the process of desertification. Noticeable differences have occurred already during the last three decades. They consist in changes in the distribution of movable dunes, which is relative to the humidity and temperature. It is believed that the climate may be the main factor causing desertification in Hunsheandake. In other regions of China, there is another significant factor: human activity, especially shepherding that causes the process of desertification and environmental degradation.
    Źródło:
    Przegląd Geologiczny; 2012, 60, 5; 267--272
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Main Features of Hydraulic Fill Soils and River Dnieper Alluvial Deposits in the Kyiv Region
    Autorzy:
    Rashchenko, Andriy
    Dyptan, Tatyana
    Malyshev, Oleg
    Powiązania:
    https://bibliotekanauki.pl/articles/1838065.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    alluvial deposits
    floodplain
    sandy soils
    tectonic structure
    deformations
    Kyiv Region
    osady aluwialne
    równina zalewowa
    gleby piaszczyste
    budowa tektoniczna
    deformacje
    region Kijowa
    Opis:
    The features of the tectonic structure together with the geological and geomorphological zoning of Kyiv city are highlighted in the article. Particular attention is paid to the floodplains of the Dnieper River, which were formed by the hydraulic fill method. As a rule, such sites were created for new constructions and were quickly built up with low rise buildings, the bases of which were made using such hydraulic soils. Completed engineering-geological investigations of sites after hydraulic filling and observation of the base deformation over time allowed setting of the basic regularity and rules for construction on such territories. The ongoing development of the city has also covered these territories, where high-rise buildings, shopping malls, and other buildings are actively being built, and the loads from these must be transferred to reliable bases.
    Źródło:
    Civil and Environmental Engineering Reports; 2020, 30, 4; 72-89
    2080-5187
    2450-8594
    Pojawia się w:
    Civil and Environmental Engineering Reports
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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