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Sedimentologische und geochemische Analysen des Sandlössprofils Doroshivtsi (West Urkaine)

Abstract

The concerning sandy loess sequence, that extends to 9 meters, is situated on a slip-off slope of the Dnie-ster near Doroshivtsi in the south-west of the Ukraine. Since 2007, the section is investigated archaeolog-ically. This section is situated on the second terrace in the slope deposits. It is a remarkable sequence of seven consecutive achaeological layers, that are dated to the upper paleolithic. The area of the middle course of the Dniester was one of the most inhabited territories during the paleolithic.
This thesis developed within the framework of the initiation of the Collaborative Research Centre (CRC) 806 „Our way to Europe“.
Age determination with optically stimulated luminescence (OSL) and radiocarbon dating (C14) lead to the assumption that the sedimentation period of the section was approximately 23.000 to 16.000 years ago. This makes Doroshivtsi a section of the last glacial maximum (LGM) with very high resolution. Hence, it takes a special position within the loess sequences in Ukaine.
Evidence concerning the paleo environment is given by means of grain size analysis, laser diffraction (Beckmann Coulter Ls13320) und additionally with X-ray fluorescence analysis (...).
Central questions are: can a development of the paleo environment and a geomorphological influence on the process during the sedimentation period be determined? Can eolian long and short term suspension or modified saltation and fluvial and downhill creep/ solifluctive movement transport, that also gives infor-mation about the area of delivery of the material, be discriminated by means of grain size distribution? Further is investigated whether pedogenesis occured in the section.
On the basis of grain size distribution, the phases of sedimentation could be differentiated between dry/ cold stages and hot/ moist stages. Also, the distribution of reworked and in situ sedimented material could be distinguished. It is further believed that the sediment has in part origin in the riverbed itself (eolic short term suspension) and in part in the loess of the northern ice sheet (eolic long term suspension). In addition, the section was arranged through downhill creep and solifluction processes.
It has to be discussed whether the development from moist to dry conditions that can be seen in the sec-tion, are ascribed to changing climatic or geomorphological condition. Geochemistry could not provide evidence for an initial pedogenesis.

Resources

Hunsalzer_Master Thesis_2013_Doroshivtsi.pdf Request access Accessed 2 times | Last updated 16.01.2017

Bibliography

Hunsalzer, C. (2013): Sedimentologische und geochemische Analysen des Sandlössprofils Doroshivtsi (West Urkaine). Geographisches Institut, Rheinisch-Westfälische Technische Hochschule Aachen

Authors Hunsalzer, Christa
Type mastersthesis
Title Sedimentologische und geochemische Analysen des Sandlössprofils Doroshivtsi (West Urkaine)
Year 2013
Pages 116
Month August
Organization Geographisches Institut, Rheinisch-Westfälische Technische Hochschule Aachen
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