Fig. 6

Magnetic analysis of concretion RB10 using Remasoft software (AGICO). (A) Natural Remanent Magnetization (NRM) measurements of RB10 in various configurations. The stereonet (upper left) and vector component plot (upper right) show magnetic directions for the whole concretion, middle, upper, and lower parts (refer to Fig. 2 for part locations). The lower left panel displays relative magnetization intensities of each part. Note that the upper section has two measurements: one with and one without sand fill. (B) NRM measurements of the middle section of RB10 (RB10m) after successive abrasions. The stereonet (upper left) and vector component plot (upper right) illustrate changes in magnetic direction during the abrasion process. The lower left panel shows the decay of magnetization intensity with each abrasion step. In both A and B: Stereonets use solid/open symbols for lower/upper hemisphere projections. Vector component plots show horizontal (blue) and vertical (green) projections. This comparison reveals the spatial variability of magnetic properties within the concretion (A) and the effects of physical abrasion on its magnetic signature (B), providing insights into the concretion’s internal magnetic structure and its response to weathering processes.