The role of DRS measurements and cluster analysis in loess research

Szeberényi, József [Szeberényi, József (Geomorfológia), szerző] MTA Csillagászati és Földtudományi Kutatóközpont; Kovács, József [Kovács, József (Földtudomány), szerző] Általános és Alkalmazott Földtani Tanszék (ELTE / TTK / Ft_K); Bradák, Balázs [Bradák, Balázs (negyedidőszak kut...), szerző]; Barta, Gabriella [Barta, Gabriella (geográfia), szerző] Természetföldrajzi Tanszék (ELTE / TTK / Frt_K); Csonka, Diána [Csonka, Diána (Geomorfológia), szerző] Földtudományi Doktori Iskola (ELTE / TTK); Horváth, Erzsébet [Horváth, Erzsébet (Természetföldrajz), szerző] Természetföldrajzi Tanszék (ELTE / TTK / Frt_K); Novothny, Ágnes [Novothny, Ágnes (lumineszcens korm...), szerző] Természetföldrajzi Tanszék (ELTE / TTK / Frt_K); Végh, Tamás [Végh, Tamás (geomorfológia), szerző] Természetföldrajzi Tanszék (ELTE / TTK / Frt_K); Varga, György [Varga, György (Porviharok, hulló...), szerző] Geomorfológiai és Negyedkorkutatási Osztály (MTA CSFK / FTI)

Angol nyelvű Tudományos Konferenciaközlemény (Egyéb konferenciaközlemény)
    • MTMT: 30736621
      Diffuse reflectance spectroscopy (DRS) parameters, such as redness index and hematite/goethite ratios are popular in the study of loess-paleosol sequences. The suggested parameters, however, have their limitations: only some parts of the whole reflectance spectrum have been used, and the spectra of some important components may have been excluded from the analysis. A mathematical statistical method, hierarchical cluster analysis, was applied to the loess-paleosol succession at Malá nad Hronom (Slovak Republic) to characterize the entire reflectance spectrum and classify sediment groups. The sedimentary units were classified into seven different cluster groups such as sediments, weak and well-developed paleosols. The distribution of the spectral features in the reflectance spectra was located using the key-wavelength, given by the Wilk’s lambda analysis. The key-minerals, which play an important role in the classification, were determined by characteristic extrema in the second derivative of reflectance spectra of the seven reference minerals (hematite, goethite, muscovite, illite, montmorillonite, kaolinite and calcite). Mineral groups influence together certain curve sections within the measured range, therefore curve sections modified by individual minerals were to differentiate only in a few cases. The mentioned mineral groups refer to characteristics of the formation environment and to climate change during the Pleistocene. Acknowledgement: The research was supported by NKFI K119366, NKFI K120620 and OTKA 100180. The paper was also supported by Balázs Bradák’s fellowship at the Research Center for Inland Seas, Kobe University, Japan was supported by the Japan Society for the Promotion of Science (JSPS). Agnes Novothny was funded by a post doctoral project of the Hungarian Scientific Research Fund (OTKA PD-100315).
      Hivatkozás stílusok: IEEEACMAPAChicagoHarvardCSL
      2020-02-29 04:03