Morängenetiska undersökningar i klintar vid Greifswalder Boddens södra kust, NÖ Tyskland

Sammanfattning: Coastal cliffs on the southern coast of Greifswalder Bodden, NE Germany, has been studied in detail at representative sections by means of lithological and structural mapping, clast fabric analyses and sampling for grain size distribution and rock composition analyses. Three genetically different diamict units (I, II and III) were distinguished. Unit I and II consists of mainly massive, sandy diamicton while the uppermost unit (III) is a complex of beds of diamicton and sorted sediments. The contact between unit I and II is gradational and indicated principally by changes in colour, density and sparsely occurring deformation structures. The lowermost unit (I) is interpreted as a lodgement till and fabric data indicate ice flow directions from the E to NE. Lack of signs of deformation, erosion or shearing, together with lesser density, suggest an interpretation as subglacial melt out till for unit II. Fabric data from this unit indicate that the last ice flow direction prior to stagnation was from NE. The petrographical composition of units I and II remained almost constant throughout all sections. This kind of petrographical composition is classified as the so called "N-NE-type" according to German standards. The uppermost very complex unit III consists of interbedded flow till and fluvial sediment, the latter deposited both from traction and suspension, and suggests a supraglacial depositional environment. Thus unit III represents the latest deglaciation phase of the area. All results combined indicate that the predominantly diamict units outcropping in the cliffs were deposited during just one single glacial event during the Late Weichselian, followed by the final deglaciation of the area.