Supplementary Material

Figure S1: XRD patterns of randomly oriented bulk powders of Erguita P-containing sediments. All XRD patterns are shown with the same intensity scale. All lithologies are presented

Figure S2: Raw magnetic susceptibility curve and associated rock magnetism dataset. Group 1 is composed of samples 28, 109, and 166. Group 2 is composed of samples 1 and 103, whereas Group 3 is only composed of sample 250. (I) Uncorrected (orange) and corrected (blue) hysteresis loop at room temperature. (II) Detail in blue of the corrected hysteresis loop. (III) Compilations of the ZFC, FC, RT-SIRM curves. (IV) ZFC curve (red) with its associated first derivative (blue). (V) RT-SIRM cycles. (VI) Detailed of the ZFC curve to observe the Verwey transition at ~120 K.

Figure S3: AMS fabric differentiated by the whole-rock Al₂O₃ content (right panels, <2 %; left panels, >2 %). In the Erguita section, the Al₂O₃ content reflects the clay mineral proportion. (a) Data plotted on a lower hemisphere stereonet projection. (b) Jelinek plot showing the shape parameter T versus the corrected degree of anisotropy P (Jelinek, 1981).

Figure S4: Scatter plots between U content, P₂O₅, and MS.

Table S1: GPS coordinates of sampled outcrops, including cylindric cores and oriented blocks.                  

Table S2: Uncertainty and detection limit of each analyzed element.                     

Table S3: U concentrations obtained by gamma-ray spectrometry.

Table S4: Mean MS values and associated standard deviations of the Erguita oriented cylindrical cores.                            

Table S5: XRD reflections and estimated CO₃^2- contents (wt.%) of representative P-containing Erguita sediments. The carbonate concentration (wt.%) in CFA grains is calculated as 10.643x² - 52.512x + 56.986 where x stands for ∆2𝞱(004-410).

© J. Aubineau et al., Published by EDP Sciences 2024