Charakterystyka eolicznych form akumulacyjnych występujących na południe od szottu Dżerid

The article includes description of aeolian accumulation forms located south of the Chott Jerid. The research was undertaken along a 250 km long transect. Forms of forced accumulation dominate in the eastern and western parts, (the nebka type forms in the east and tamarisk hills in the west). In the middle part (closer to the chott) forms of free accumulation dominate - mainly barchans or barchanoidal dunes. Sedimentological analysis of aeolian sands and substratum sediments allow to assess the aeolian transport path as well as the sediment source. Granulometric indices and mineral-lithological analysis showed that the researched forms are built with allochthonous quart grains. In some places share of local gypsum grains in dunes (originated from the local substratum) increases. Complex analysis show that sedimentological features of the dunes depend on the distance from the chott. Additionally it can be stated that the type of the dune is related only to a minimal degree with sedimentological features of the building material.