Karpatian sandy deposits in the southern part of the Carpathian Foredeep in Moravia


Authors: Nehyba S, Petrová P

Published in: Bulletin of Geosciences, volume 75, issue 1; pages: 53 - 66;

Keywords: Karpatian, shallow marine deposits, storm-fair weather alterations, shoreline progradation, relative sea level changes,

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Sandstone beds of highly varied thickness are known from Karpatian deposits in the southern part of the Carpathian Foredeep. They are overlain, interfingered and they also overlain typical Karpatian 'schlier' deposits. Sandy beds are products of various processes. Some beds are products of storms when large volumes of sand are transported offshore in suspension currents which decelerate over the shelf. Other sandy beds are products of shoreline deposition reflecting periods of shoreline progradation. Depositional system was classified as predominantly shallow marine.
Studied Karpatian deposits have been subdivided into four segments based on the study of facies, facies successions and foraminifera assemblages. Origin of the segment is interpreted according the dominant trend in the relative sea level change. Basal segment A is interpreted as early transgressive and is a product of the coastal plain deposition. Segment B is interpreted as transgressive and the main part is the product of deposition of the inner shelf. The source of sandy material is primarily connected with the successive detachment and reworking of the coast. Segment C is interpreted as highstand and their deposits are products of the deposition of the outer shelf and inner shelf. Segment D is connected with falling stage and their deposits are products of inner shelf and shoreline. Presented subdivision of the Karpatian deposits of CF is very incomplete and preliminary. Further correlation studies in more detailed scale and over a greater basinal extent are necessary.
Within the whole studied profile of Karpatian deposits a general trend from accommodation-dominated to supply-dominated shelf regime can be recognised.