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Dobrowolski, R.; Mroczek, P.
Clay cortex in epikarst forms as an indicator of age and morphogenesis—case studies from lublin–volhynia chalkland (east poland,west ukraine)
Geomorphology
2014
1
10

Clay cortex from the contact zone between the host rock (chalk) and infilling deposits were examined in

paleokarst forms (pockets, pipes, and dolines of different age) from the Lublin–Volhynia chalk karst region. In light of the sedimentological and micromorphological analyses, it seems possible to work out a model as the basis for genetic and stratigraphic discussions. (1) Dolineswith the Paleogene orNeogene mineral infills are characterized by (a) homogeneous, residual type of massive clay gradually passing into the chalkmonolith, and at the sametime(b) relatively thickweathered zone. (2) Pipeswith glacigenic mineral infill fromthe Saalian Glacial are characterized by (a) sharp contact between host rock and clay, (b) narrow weathering zone of chalk, (c) diffuse nature of the contact zone between residual clay and mineral infill, and (d) contamination of clay by clastic material. (3) Pocketswith glacigenic mineral infill and traces of theWeichselian periglacial transformation are characterized by (a) strong contamination of chalk by quartz grains, (b) diffuse transition between clay and infill: fromclayey matrixwith single quartz grains (at the contactwith chalk) to clayey coatings and intergranular bridges (in the infill), (c) intensive weathering (cracking) of mineral grains in the infill.

Epikarst; Micromorphology; Sedimentology; Lublin–Volhynia chalkland; Poland E; UkraineW
0169-555X
0169-555X
Dobrowolski, R.; Mroczek, P., 2014, Clay cortex in epikarst forms as an indicator of age and morphogenesis—case studies from lublin–volhynia chalkland (east poland,west ukraine) , Geomorphology , 1 - 10 http://www.sciencedirect.com/science/article/pii/S0169555X14006205, PDF