Loess paleosol sequences (LPS) have the ability to preserve past environmental and climatic conditions. Therefore, they are a widely used terrestrial archive for the reconstruction of paleoclimatic dynamics. In this study, we use several proxies (grain size distributions, geochemical analysis, rock magnetism, and color measurements) to study past environmental changes in a LPS covering the MIS 2/MIS 3 transition. Geochronological control is given by post infrared infrared stimulated luminescence dating of polymineral ﬁne grains. The research aim lies in the reconstruction of the paleoenvironmental conditions at the loess-paleosol sequence Bodrogkeresztúr in northeastern Hungary using a multi-proxy approach.
The sequence is located at the foot of the Kopasz hill, the southernmost part of the Tokaj Mountains, which belong to the Carpathian mountain range. The area is famous for the Bodrogkeresztúr-Henye Gravettian site (Lengyel, 2015). The proﬁle contains eolian loess deposits intercalated by two paleosols. The lower paleosol overlays possibly ﬂuvial clay (ﬁne overbank deposits) forming the base of the proﬁle. The luminescence samples have been tested thoroughly and have been measured with the pIR50IR290 protocol (Thiel et al., 2011). The ﬁnal age assessment between 28.0±2.1 ka and 33.5±2.5 ka ﬁts well to the established geochronologies of the Kopasz hill (Sümegi and Hertelendi, 1998) and the Tokaj section (Schatz et al., 2012).
Paleoenvironmental conditions are investigated through the multi-proxy approach. The measurement of the anisotropy of magnetic susceptibility is interpreted in regard of paleowind directions. The magnetic susceptibility is enhanced in paleosols, especially in the lower one, indicating strong pedogenesis. Grain size parameters also show high clay contribution in the lower paleosol, but also indicate two distinct features of stronger wind dynamics in the loess layer in the middle of the proﬁle (double sigmoidal ﬂuctuations in all grain sizes), which is also visible in the color trends. Similarly, geochemical data indicate increased weathering in the lower paleosol. Accordingly, it can be deduced that MIS 3 was likely more humid at Bodrogkeresztúr in comparison to the inner parts of the Carpathian Basin. This underlines the assumption that Anatomically Modern Human migration followed the foothills of the Carpathians.
https://meetingorganizer.copernicus.org/EGU2017/EGU2017-15802.pdf Accessed 85 times | Last updated 10.07.2018
Bösken, J., Obreht, I., Zeeden, C., Klasen, N., Hambach, U., Sümegi, P., Lehmkuhl, F. (2017): Paleoenvironmental conditions at the loess paleosol sequence Bodrogkeresztúr in NE Hungary. EGU General Assembly 2017, 23.-28.4.2017, Vienna, Austria
|Authors||Bösken, Janina and Obreht, Igor and Zeeden, Christian and Klasen, Nicole and Hambach, Ulrich and Sümegi, Pál and Lehmkuhl, Frank|
|Title||Paleoenvironmental conditions at the loess paleosol sequence Bodrogkeresztúr in NE Hungary|
|Organization||EGU General Assembly 2017, 23.-28.4.2017|