Figure 8
Statistical analysis based on XRF-CS datasets for the cores CALA-04, CALA-05 and CQ14_02. PCA biplots showing the contributions of 10 elemental concentrations to explain the HAT units in the core CALA-04 (A), CALA-05 (B) and CQ14_02 (C). The overlaps of the areas delimitated by the ellipses indicate higher similarities among the units, while the proximity of the units to the geochemical vectors suggest stronger contribution of them to differentiate the respective groups of the cases (1 cm vertical resolution samples). The percentages presented in the axis titles correspond to variance explained by each principal component (PC).
