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Litodynamiczne zróżnicowanie składu minerałów ciężkich w utworach wschodniej części Mierzei Dziwnowskiej

Racinowski R.

Zeszyty Naukowe. Marine Sciences / Uniwersytet Szczeciński

1998

Nr 4

53-73

The paper presents lithodynamic interpretation of the results of investigations into heavy minerals separated from the Dziwnów Sandbar shore substratum (down to a depth of 7m below ground level) and from the shoreface debris (down to a depth of 6m below sea level). The localization of the research stations is shown in Fig.1. In the shore substratum the following three complexes of deposits were separated. Complex I represents the deposits of current shore accumulation (Ia - sand horizon, Ib - sand-gravel horizon). Complex II is sandbar-dune deposit that has accumulated by stages from Middle Holocene to Upper Holocene (IIa - sand horizon, IIb - sand-gravel horizon, IIc - organic deposit horizon). Complex III is formed by Vistulian glaciation boulder clays. Based on the weight content of heavy minerals, the opaque minerals concentration, the muscovite fraction and the concentration of transparent minerals with various hydraulic equivalents the percentage similarity of the sandbar-dune and maritime materials to the boulder clays was determined making use of the Wanke's method. It has been found that, in terms of guality, the deposit of the Complex I and II, s well as those of the shoreface debris exhibit a similarity to the glacial deposits (Complex III). By analogy it is concluded that the sandbar-dune deposits (Complex II) were being formed under lithodynamic conditions similar to those conditions under which the recent shore deposits (Complex I) have been formed. However, during the complex II formation, the sedimentation environment dynamics was weaker than that recent. During the complex II and complex I deposits accumulation, the debris was being transported alongshore from the east to the west. Within the shoreface, apart from areas where the debris deposition or slow transit occur, there are areas where the shoreface caving has clearly taken place. This process is particularly clearly visible within the shore section from 388th km to 390th km. On the shore side this is an area that is most intensively eroded by sea waters and is presently protected against abrasion by means of a complex system of hydrotechnic structures.