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2 Geological Quarterly

2 2007

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Sedimentary environments of the Late Pleistocene terrestial deposits at Kolodiiv (East Carpathian Foreland, Ukraine) in the light of elementary and aggregate grain-size composition

Seul C.

Geological Quarterly

2007

Vol. 51, No 2

179-184

The results of grain-size analysis of silt deposits from the Kolodiiv site are presented. The seven profiles examined are situated on the terrace of the Sivka River, along a ca. 1 km stretch of its right bank. They comprise Wartanian alluvial sands and gravels over lain by Eemian deposits and Vistulian loess. The average results of aggregate and elementary analyses of selected stratigraphic units, standard grain-size in dices, and some aggregation indices are shown. The results obtained indicate that initial loess material deposited in Kolodiiv was generally not differentiated. Only the youngest palaeosols and the younger loess deposits are enriched in silt, which may suggest lower velocities of wind transporting the material or a change in source material (e.g. from sandy-silty flood sediments to clayey lacustrine sediments). Some changes in source material, transportation force or redeposition of material (e.g. by slope processes) may be deduced from the variable skew ness and flat ness of the grain-size distribution, both aggregate and dispersion.

Palaeomagnetic studies of the loess-palaeosol sequence from the Kolodiiv section (East Carpathian Foreland, Ukraine)

Nawrocki J., Boguckyj A., Łanczont M.

Geological Quarterly

2007

Vol. 51, No 2

161-166

The Upper Pleistocene loess-palaeosol sequence from the Kolodiiv section (East Carpathian Fore land) has been palaeomagnetically studied. Almost all samples displayed moderate to high positive palaeomagnetic inclinations and declinations en closed between 320° and 40°. How ever, one sample from the fossil soil of the last inter glacial pedocomplex (at 16.6 m pro file depth) was reverse magnetized and there fore can be correlated with the Blake Palaeomagnetic Event. Consequently that palaeosol can be related to (Oxygen Isotope Stage) OIS 5e1. An other sample from the Dubno 1 interstadial palaeosol demonstrated southern declination and significant lowering of inclination (up to 40°). This might be a record of the Laschamp Palaeomagnetic Event or of any Late Pleistocene palaeomagnetic excursion. The magnetic susceptibility and anhysteretic remanent magnetization data reflect the presence of several soils forming during the warm conditions of OIS 5 and the complex nature of the Eemian warming. Two palaeosols that developed between ca.115 ka and 120 ka indicate at least two climatic optima during the Eemian. High values of magnetic susceptibility (up to 300 Ą 10-6 SI units) noted in the middle of the section that contains slump deposits (9.5 m to 11m of depth) suggest that this material was derived from older soils of inter glacial type.