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Wyszukujesz frazę "Alexanderson, H." wg kryterium: Autor


Wyświetlanie 1-2 z 2
Tytuł:
Landsat mapping of ice-marginal features on the Taymyr Peninsula, Siberia - image interpretation versus geological reality
Autorzy:
Alexanderson, J.H.
Powiązania:
https://bibliotekanauki.pl/articles/2059388.pdf
Data publikacji:
2000
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Siberia
Taymyr
landsat
Multispectral Scanner (MSS)
glacial geology
ice-margin
Opis:
To solve the question concerning the age and extent of the latest glaciation in northern Eurasia, several geological investigations were carried out. This paper describes work done on the North Taymyr ice-marginal complex on the Taymyr Peninsula in north central Siberia. The initial remote sensing work aimed to survey fieldwork localities and to acquire a regional geological overview. A Landsat 5 Multispectral Scanner (MSS) image was interpreted, both visually and by computer-based techniques. The ice-marginal zone is clearly visible on the satellite image and it was possible to distinguish spectrally different ground-types. In total, seven ground-types have been discerned and they are described and discussed. A geological interpretation of them was made after combining the initial results with the information gained from ground-truthing, which included sedimentological and morphological fieldwork. It is necessary to take topography and associations of classes into consideration when interpreting the final map, since the identification of some ground-types is not univocal.
Źródło:
Geological Quarterly; 2000, 44, 1; 15-25
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New luminescence ages reveal Early to Middle Weichselian deposits in central Latvia
Autorzy:
Lamsters, K.
Kalińska-Nartiša, E.
Zelčs, V.
Alexanderson, H.
Powiązania:
https://bibliotekanauki.pl/articles/2060383.pdf
Data publikacji:
2017
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
optically stimulated luminescence (OSL) dating
subglacial bedforms
Early Weichselian
Middle Weichselian
central Latvia
Opis:
New optically stimulated luminescence (OSL) ages show that sandy deposits overlain by Late Weichselian subglacial till in central Latvia are of Early to Middle Weichselian age. The finer chronological resolution of unconsolidated sediment deposition in the Central Latvian Lowland (CLL) remains relatively unstudied, and here we provide a first characterisation of the deposits with respect to their age. Three OSL ages ranging between 84 ± 9 ka and 112 ± 11 ka suggest that the deposits studied in the CLL are of Early Weichselian age (MIS 5). We found no Middle Weichselian deposits in the CLL, and assume that any such younger sediments might have been eroded during the advance of the Zemgale Lobe in the Late Weichselian. One site, in the ice-marginal zone adjacent to the interlobate area, has nevertheless deposits dated to 44 ± 10 ka corresponding to the Middle Weichselian (MIS 3). Our results are compatible with existing ESR ages on three sets of Portlandia arctica shells from the central part of the lowland; the shells had been incorporated into glacial deposits during later glacial advances. Finally, our findings largely support ice-free conditions during the Early and Middle Weichselian in the middle and southern part of central Latvia.
Źródło:
Geological Quarterly; 2017, 61, 2; 480--490
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-2 z 2

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