Stratygrafia i deformacje glacitektoniczne kredy piszącej w Kornicy na Podlasiu
Abstract
STRATIGRAPHY AND GLACITECTONIC DEFORMATIONS OF CHALK IN KORNICA - PODLASIE LOWLAND (EASTERN POLAND)
Summary
In the Podlasie Lowland (Eastern Poland) mads and chalk of the Upper Cretaceous age occured in the surface in three regions. They form large glacitectonic structures folded within the Tertiary and Quaternary sediments. These structures are recognized detaily only in the vicinity of Biała Podlaska between villages Zienie and Kornica (Fig. 1). In this region calcareous deposits are exploited in a few outcrops and they have been documented by several hundred boreholes. The sequence of sediments consists of, eight stratigraphic members characterised by lithology, assemblages of micro fossils and changes of main chemical components. Members Kl - K4 represent the Santonian-Campanian, while Ml -M4 - Lower Maastrichtian. Statistical analysis of chemical data enable the correlation of particular members in boreholes and outcrops (Fig. 2, 3). They form narrow belts with SW - NE or WSW - ENE, strikes interpreted as glacitectonic structures composed of a few assimetrical folds diping northward (Fig. 4). The overlap one another and in 27 profiles the Tertiary and Quaternary sediments have been found below the Upper Cretaceous chalk and mads. The structures exceed the depth 120 m. Similar deformations have been described by H. Ruszczyriska-Szenajch (24, 25) as uplifted and squashing zones associated with glacitectonic depressions. A part of them, including probably structures in Kornica, is connected with the Middle Polish Glaciation
Summary
In the Podlasie Lowland (Eastern Poland) mads and chalk of the Upper Cretaceous age occured in the surface in three regions. They form large glacitectonic structures folded within the Tertiary and Quaternary sediments. These structures are recognized detaily only in the vicinity of Biała Podlaska between villages Zienie and Kornica (Fig. 1). In this region calcareous deposits are exploited in a few outcrops and they have been documented by several hundred boreholes. The sequence of sediments consists of, eight stratigraphic members characterised by lithology, assemblages of micro fossils and changes of main chemical components. Members Kl - K4 represent the Santonian-Campanian, while Ml -M4 - Lower Maastrichtian. Statistical analysis of chemical data enable the correlation of particular members in boreholes and outcrops (Fig. 2, 3). They form narrow belts with SW - NE or WSW - ENE, strikes interpreted as glacitectonic structures composed of a few assimetrical folds diping northward (Fig. 4). The overlap one another and in 27 profiles the Tertiary and Quaternary sediments have been found below the Upper Cretaceous chalk and mads. The structures exceed the depth 120 m. Similar deformations have been described by H. Ruszczyriska-Szenajch (24, 25) as uplifted and squashing zones associated with glacitectonic depressions. A part of them, including probably structures in Kornica, is connected with the Middle Polish Glaciation