Geneza form ostańcowych - wschodnie obrzeżenie szottu Dżerid

• Autorzy: Dubis L. , Dluzewski M.

Warianty tytułu

EN

Genesis of residual hills - east margin of the Chott Jerid

• Języki publikacji: PL

Abstrakty

EN

The aim of the research was to describe origin of aeolian residual hills located in the eastern part of the Chott Jerid. Two areas were selected to the research, first in a vicinity of Bechri (within the Pliopleistocene range of the chott), second 10km north of El Faouar (within the Holoce floor of the Chott). Morphometry of the forms and analysis of prevailing wind directions in the first research area proved, that the hills are erosion residual hills and can be called yardangs. Aeolian erosion as a shaping factor is questioned in the second research area, because of lack of longest axis of the forms as well as lack of the yardang-like shapes. It is put forward that the forms in the second research area originated mainly from salt weathering (exudation). Analysis of internal structure of the forms showed that the sediments were accumulated in aeolian environment. In the case of the first research area the accumulation produced barchans and barchanoidal dunes while in the second researched area – longitudinal dunes (seif-dunes). Textural features of the sediments building the residual hills, particularly medium sorting (σ₁= 0,6-0,8) and dominant share of gypsum (60-80%) which is not resistant to mechanical abrasion, show that aeolian transport was short and the material source was quite near. The researched residual hills are of different age. The forms in the vicinity of Bechri were created during the 20th c. TL dating of the material constituting the hills near El Faouar shows that accumulation of the material took place over 30 ka BP.

• Wydawca: -
• Czasopismo: Prace i Studia Geograficzne
• Rocznik: 2006
• Tom: 37
• Opis fizyczny: s.47-67,rys.,tab.,wykr.,fot.,bibliogr.

Twórcy

autor

Dubis L.

• Zakład Geografii Stosowanej i Kartografii, Wydział Geografii, Uniwersytet im.Iwana Franka we Lwowie, Lwów

autor

Dluzewski M.

• Zakład Geomorfologii, Wydział Geografii i Studiów Regionalnych, Uniwersytet Warszawski w Warszawie, Warszawa

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