The paper contains results of investigations done in Lithuania for the first time on the spatial structure of Pleistocene deposit grain-size composition. The statistical grid method has been applied for 2–2.5 m thick surface deposits with 5 × 5 km grids. The typology of diversity in grain size composition has been constructed, i. e. very uniform, uniform, rather diverse, diverse, and very diverse types were singled out. According to distribution peculiarities in grain-size composition diversity and different values of grids, the type microregions have been established and generalised by joining them into certain individual regions. The paper presents a concept of grain-size composition spatial structure diversity and peculiarity and shows that the main factors causing diversity in grain size composition are glacigenic and epigenetic processes. The grain-size composition diversity has been found to be highest at the interface of deposits of different genetic types (and different genetic types of relief). At the macro-level of the relief, the highest diversity was typical of upland and lowland interfaces formed by both glacial and aquaglacial processes, as well as those re-formed by epigenetic, especially fluvial, processes.

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2011 - Vol.53
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