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Wyszukujesz frazę "terraces" wg kryterium: Temat


Wyświetlanie 1-2 z 2
Tytuł:
Litostratygrafia plejstoceńskiego tarasu wysokiego doliny Łagowicy w rejonie Masłowca (SE część Gór Świętokrzyskich)
Lithostratigraphy of the Pleistocene high meadow terrace of the Lagowica Valley near Mas3owiec (SE part of the Holy Cross Mountains)
Autorzy:
Ludwikowska-Kędzia, M.
Wiatrak, M.
Olszak, I.
Bluszcz, A.
Powiązania:
https://bibliotekanauki.pl/articles/2074436.pdf
Data publikacji:
2006
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
litostratygrafia
taras rzeczny
plejstocen
Góry Świętokrzyskie
lithostratigraphy
river terraces
Pleistocene
Holy Cross Mountains
Opis:
The lithostratigraphy of the Pleistocene high meadow terrace deposits in the Łagowica Valley near Masłowiec, southeastern part of the Holy Cross Mountains, central Poland, is presented against the background of geological features and relief of the valley in the Łagów–Ruda segment. The lithostratigraphic divisions for the Holy Cross Mountains assume Middle- Polish Glaciation age for high terraces in valleys. Hypsometry of terraces often served to estimate their age. Detailed sedimentological analysis of deposits forming the terrace of the Łagowica Valley near Masłowiec (textural and structural features, TL and OSL datings) have indicatived a complex fluvial-deluvial origin of the deposits and their Plenivistulian, not Middle Polish Glaciation age. The actual aggradation of the valley bottom has been partly masked by slope processes, which due to local lithostructural conditions, significantly participated in the Łagowica Valley bed aggradation. This problem is well-known in other upland regions of Poland and has been only briefly noted in the Holy Cross Mountains. The research methods and results can be useful in establishing the origins of deposits building meadow terraces, also then when only borecore material is available. The methods can also faciltate stratigraphic interpretation of deposits dated with TL and OSL methods
Źródło:
Przegląd Geologiczny; 2006, 54, 11; 953-962
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tarasy rzeczne Nysy Kłodzkiej oraz drobne plejstoceńskie struktury tektoniczne w strefie sudeckiego uskoku brzeżnego i przełomu bardzkiego w Janowcu
Terraces of Nysa Kłodzka river and small-scale tectonic structures close to the Sudetic Marginal Fault at Janowiec [Bardo Mts.]
Autorzy:
Badura, J.
Przybylski, B.
Tokarski, A.
Świerczewska, A.
Powiązania:
https://bibliotekanauki.pl/articles/2074547.pdf
Data publikacji:
2007
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Nysa Kłodzka
tarasy rzeczne
klasty
pleistocen
Nysa Kłodzka River
neotectonics
river terraces
fractured clasts
Pleistocene
Opis:
New research in the N part of the Bardo Gorge [close to the Sudetic Marginal Fault] evidenced the occurrence of two hitherto unknown Pleistocene river terraces. The terraces were interpreted basing on digital elevation model [DEM] 1;10,000 and radars sweeping of the Earth’s surfaces [DETM level 2]. Moreover, the results of petrographical analysis of deposits exposed in the 22 high river terrace show two-tier structure of the terrace. This suggest a polygenetic age of the terrace. Within the last terrace fractured clasts and small-scale faults were observed. Fractured clasts were studied in the bottom part of the 22-m-high river terrace where numerous fractured clasts occur. This part of the terrace is composed of gravels containing clasts up to 80 cm across. The matrix is sandy-clayey. The fractures are usually restricted to particular clasts. The fractures compose two sets striking NW-SE and N-S. Gravels exposed in the uppermost part of the terrace are cut by few strike-slip, N-S striking, sub-vertical faults which can be traced along a vertical distance up to 50 cm. These faults cut the gravel matrix but omit clasts. Fractures cutting the clasts do show a well organized architecture which is independent of orientation of a-b surfaces of the host clasts. These features indicate that the fractures were formed in situ within the studied gravels. Furthermore, for the majority of fractures, the angle between the fracture and the a-b surface of the host clast is less than 80, confirming the in situ origin of fractures. The fractures of one set are parallel to the strike of the Sudetic Marginal Fault. This suggests that the origin of the fractures is related to that of the fault. The fractures of the second set may represent Riedel shears associated with the activity of the Sudetic Marginal Fault. The orientations of minor faults confirm this supposition. Summing up, we believe that during the Pleistocene, the Sudetic Marginal Fault was a dextral strike-slip fault, at least in the discussed area.
Źródło:
Przegląd Geologiczny; 2007, 55, 3; 228-228
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-2 z 2

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