Figure 5
Low field magnetic susceptibility χLF Hz (in m3 kg−1) vs. frequency dependent susceptibility (χfd = χ300 Hz − χ3000 Hz in m3 kg−1). Samples from volcanogenic areas of the Armenian Highlands (blue) plot in the highest value ranges reflecting high contributions of magnetic ores. Samples from the mostly fluvial sediment infill of the Kura Basin (yellow and green) plot in lower value ranges, probably reflecting the admixture of eroded limestone (diamagnetic minerals). Samples from the LPS BL (red) plot in the same lower range as the Kura Basin samples, while higher χLF values within the loess indicate a higher admixture of clastic volcanic material. Horizontal dashed lines indicate the upper limit of χLF in LPS of NE-Armenia, China50 and the Carpathian Basin49. Most recent channel deposits from the Kura Basin (green) plot in the same highly magnetic ranges as the volcanogenic samples from the Armenian Highlands, indicating that these current fluvial deposits are mainly fed by volcanic sources from the upper catchment areas and not by the surrounding Kura Basin infill.
