Measuring and evaluating colorimetric properties of samples from loess-paleosol sequences

Abstract

Colorimetric measurements are valuable in studying paleoenvironmental changes in sediment archives such as loess-paleosol sequences. These measurements allow for the identification of climate-sensitive minerals such as hematite, goethite, and secondary carbonates, as well as the observation of stratigraphic changes influenced by paleoclimate variations. Herein, a detailed workflow protocol emphasizing mineral abundance extraction by determining true band amplitudes is presented. Moreover, we present a protocol for colorimetric measurements that eliminates container bias, allowing the analysis and re-analysis of stored sediment quickly and inexpensively. Finally, we introduce a new R-package ('LESLIE') for graphical data display and enhancement. The protocol and its validation are demonstrated on the Suhia Kladenetz loess-paleosol sequence of northern Bulgaria. • A detailed workflow protocol eliminating container bias in colorimetric measurements and extracting mineral abundances is presented. • The protocol is independently validated with aid of Attenuated Total Reflectance Fourier Transform mid-infrared (ATR-FTIR) spectroscopic experiments. • Stratigraphic color enhancement using the R-package 'LESLIE' is facilitated by a user-friendly R-shiny application.

Description
Keywords
Calcite, Color enhancement, Colorimetry, Goethite, Hematite, Loess-paleosol sequence, Spectrophotometry
Citation
Citation
Laag, C., Lagroix, F., Kreutzer, S., Chapkanski, S., Zeeden, C., & Guyodo, Y. (2023). Measuring and evaluating colorimetric properties of samples from loess-paleosol sequences (Version publishedVersion, Vol. 10). Version publishedVersion, Vol. 10. Amsterdam [u.a.] : Elsevier. https://doi.org/10.1016/j.mex.2023.102159