Fig. 6: Principal component analysis (PCA).
From: Dry hydroclimates in the late Palaeocene-early Eocene hothouse world
a PC1dis- PC2dis plot. b PC1all-PC2all plot. PCAall includes all carbonate free basis (CFB) magnetic mineral concentration parameters (see Supplementary information). Bulk-rock (BR) magnetic mineral concentration parameters were not used. In b, CFB labels were removed for clarity. HCC and LCC correspond to the unmixed high coercivity component and the most significant low coercivity component 1, respectively (see Fig. S10; Supplementary information). c Ca and CaCO3 records. CaCO3 is presented in terms of mean (black) ± 2 standard errors (2SE; grey shaded bands)19. d PC1dis, e PC1all, f PC2all scores. Hyperthermals (Palaeocene-Eocene Thermal Maximum (PETM), Eocene Thermal Maximum (ETM) 2 and ETM 3), smaller carbon cycle perturbations, the early Eocene terrigenous zone (EETZ), and the early Eocene low magnetisation zone (EELMZ) are indicated with orange, purple, green and yellow bands, respectively. The dashed blue line in (d), (e), and (f) indicates 0 in the y-axis. Lithology is presented at the bottom of the figure with reddish (pink) and whitish limestones (grey) and marls (red).
