## 5 Discussion
Below sample SL1-10, having the highest measured value along the profile, mainly carbonate sediment appeared toward the end of profile (see samples SL1-11 and further in Figure 4A). Consequently, these sediments are diamagnetic and non-magnetic. Along the seven-meter long KG1 profile measured in the Crnopac Cave System (former Kita Gacesina Cave), magnetic susceptibility values are between 50.0-80.0 \(\times\) 10\({}^{-5}\) SI units (see Figure 4B). In sample KG1-14, the following minerals have been determined by XRD: calcite, quartz, goethine, gibbsite, kaolinite, chlorite, and micas. In sample KG1-14 the lowest magnetic susceptibility value has been measured: 53.3 \(\times\) 10\({}^{-5}\) SI units, still indicating minerals with metal ions in its mineral composition. The second profile (KG2) measured in the Crnopac Cave System is two meters long, and it is located closer to the cave entrance, compared to profile KG1 (see Figure 2). Measurements were taken with 20 cm distance between sampling points. Except for the first measuring point, the measured magnetic susceptibility values are very low (10 \(\times\) 10\({}^{-5}\) SI \begin{table}
\begin{tabular}{c c c c c} \hline \hline  & **Profile** & **10 kHz/0.46 kHz** & **10 kHz/4.64 kHz** & **0.46 kHz/4.64 kHz** \\ \hline \multirow{3}{*}{Cc} & SL1 & 0.8415 & 0.8461 & 0.9997 \\  & KG1 & \(-\)0.4951 & \(-\)0.4829 & 0.9973 \\  & KG2 & 0.6726 & 0.6528 & 0.9988 \\ \hline \multirow{3}{*}{RMSE} & SL1 & 22.9418 & 24.4087 & 5.8791 \\  & KG1 & 26.1759 & 30.0549 & 7.6723 \\  & KG2 & 10.4041 & 0.4909 & 0.9723 \\ \hline \multirow{3}{*}{MAE} & SL1 & 16.6370 & 18.0074 & 3.8444 \\  & KG1 & 20.7800 & 25.1400 & 7.6267 \\  & KG2 & 7.9091 & 8.2545 & 0.7455 \\ \hline \multirow{3}{*}{RSQ} & SL1 & 0.7082 & 0.7159 & 0.9994 \\  & KG1 & 0.2452 & 0.2332 & 0.9946 \\ \cline{1-1}  & KG2 & 0.4524 & 0.4262 & 0.9976 \\ \hline \hline \end{tabular}
\end{table} 
Table 2: [PERSON]’s correlation coefficient (Cc), root mean square error (RMSE), mean absolute error (MAE) and r-squared (RSQ) calculated between values obtained at three different frequencies: 10 kHz from in situ measurements, and 0.46 and 4.65 kHz from the laboratory analysis. units) and persistent along the profile. Diamagnetic minerals are confirmed by XRD in sample KG2-8, showing sediment composition of almost completely quartz. According to the data obtained at the SL1 profile, sediment with predominantly paramagnetic, even ferrimagnetic to anti-ferrimagnetic minerals in its composition can be distinguished at the upper third of the profile. This sediment was probably accumulated during cave development, as the residue of intensive karstification and weathering, as well as pedological processes [44,45]. In the rest of the profile, diamagnetic minerals prevail (carbonates and some quartz), developed from the underlying karst carbonate rocks. Data obtained from profiles KG1 and KG2 show evidence of re-sedimentation from various rocks and possibly of the changing climate while they were being re-sedimented. Changes in magnetic susceptibility values along the measured profiles can also be considered as a result of sediment composition variations. The accuracy of the Bartington MS2B device is nearly 100% due to its continuous electronic standard calibration. The measured values align closely with the magnetic susceptibility values documented in similar studies [44]. Therefore, the magnetic susceptibility values recorded in this research demonstrate high stability at both low (0.46 kHz) and high (4.65 kHz) frequencies (see Figure 4, Table 2). The main obstacle for Kappameter KM-7 calibration is weathering of the surface, which affects the results considerably. The weathering effect can hardly be evaluated. Unstable cave environment conditions can influence magnetic susceptibility recordings in situ. Therefore, the results of this study suggest using the portable KM-7 device for preliminary examination of the presence of magnetic susceptibility variations along sediment profiles.