Biplot based on principal components analysis performed on the weight % concentrations of Omalos MTP major inorganic compounds, weight (%) of loss-on-ignition (LOI) and trace element concentrations (m = 37) for the n = 9 sampled horizons along the core. The scores of each element are plotted along the first two principal components axes PC1 and PC2, which represent 56.6% and 16.7% of the total variance, respectively.