Paleoclimate implications from grain-size analysis of loess/paleosol sequences from the Carpathian Basin

Novothny, Ágnes [Novothny, Ágnes (lumineszcens korm...), szerző] Természetföldrajzi Tanszék (ELTE / TTK / Frt_K); Országh, Tamás; Varga, György [Varga, György (Porviharok, hulló...), szerző] Geomorfológiai és Negyedkorkutatási Osztály (MTA CSFK / FTI); Barta, Gabriella [Barta, Gabriella (geográfia), szerző] Természetföldrajzi Tanszék (ELTE / TTK / Frt_K); Csonka, Diána [Csonka, Diána (Geomorfológia), szerző] Földtudományi Doktori Iskola (ELTE / TTK); Végh, Tamás [Végh, Tamás (geomorfológia), szerző] Természetföldrajzi Tanszék (ELTE / TTK / Frt_K); Horváth, Erzsébet [Horváth, Erzsébet (Természetföldrajz), szerző] Természetföldrajzi Tanszék (ELTE / TTK / Frt_K)

Angol nyelvű Tudományos Konferenciaközlemény (Egyéb konferenciaközlemény)
    • MTMT: 30736616
      Great areas in the Carpathian Basin are covered by Quaternary eolian deposits, providing excellent archives for paleoclimatic and paleoenvironmental studies. Detailed grain-size investigation of five loess-paleosol sequences (Süttő, Basaharc, Hévízgyörk, Villánykövesd, Beremend; Hungary) were carried out with sampling resolution of 2 cm. Time frame for the investigations were elaborated by luminescence (post-IR IRSL) and Amino Acid Racemization (AAR) dating. The samples were only treated by 1% ammonium hydroxid, therefore they can be considered bulk samples. Test measurements were also carried out on samples which were also treated by HCl or H2SiF6 in order to dissolve carbonates, or any other minerals but quartz, respectively. Grain-size distributions were determined using a Beckman-Coulter LS 13320 PIDS laser diffraction particle size analyzer, covering the range of 0.02-2000 μm, at the Leibniz Institute for Applied Geophysics (LIAG), in Hannover. Clay- and sand content and U-ratio were calculated from the grain-size distribution of each sample and these values were plotted against the depth of the profiles. Comparing the variation of these values and trends, temporal and spatial changes could be concluded. Most of the individual grain size distribution curves were polimodal, therefore numerical partitioning using Weibull distribution can be applied to separate finer and coarser components of the curves. Changes in the relative proportions of these components throughout all sequences can be interpreted as temporal and spatial changes of the different transport mechanism. Limitations, practicability of the method, as well as results and their interpretation will be presented in this study. Thanks to the Leibniz Institute for Applied Geophysics, Hannover for the grain size measurements and to the Hungarian NRDIO projects K119366 and 100315. This study was also funded by the ÚNKP-17-4 and ÚNKP-18-4 New National Excellence Program of the Ministry of Human Capacities.
      Hivatkozás stílusok: IEEEACMAPAChicagoHarvardCSL
      2020-01-18 09:58