Geologija / Geology
 ISSN 1392-110X ISSN 2029-056X (online) |
2006 m. Nr. 2 Sedimentology of clastic intertill deposits studied in
Dovainonys and Rokai outcrops, Central Lithuania
A detailed structural, textural and compositional research of clastic intertill sediments in the Dovainonys and Rokai outcrops in Central Lithuania was carried out with a sedimentological analysis of bedding, grain size and geochemical composition of sediments in both outcrops. The deposit bedforms and composition are presented as a result of deposition in different environments of sedimentation. Sediment differences of glaciodeltaic and nonglacial fluvial environments are discussed on the successions of lithofacies revealed.
The sedimentation of intertill deposit sequence in the Dovainonys site was related to the formation of glacigenic delta of trinomial structure with developed deltaic topsets, foresets and bottomsets in the proglacial basin. The sedimentation of intertill deposits in the Rokai sediment sequence was related to the nonglacial fluvial sedimentation in a river of meandering character. The lower amount of CaO, MgO, Na2O, MnO and P2O5 in nonglacial intertill sediments in comparison with proglacial ones is related to a higher sediment geochemical maturity. Keywords: Pleistocene sedimentology, intertill deposits, sediment structure, grain size, geochemistry, lithofacies, glaciodeltaic and fluvial sedimentation, sediment geochemical maturity, Lithuania |
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