Fig. 5

Major and trace element geochemistry of the Cretaceous sandstones. a CaO–LOI and b CaO–SiO₂ plots display strong correlations, suggesting that CaO is almost entirely associated with the carbonate content. c Classification of the analyzed sandstone samples from each formation based on the scheme of Herron (1988). d Cr/V versus Y/Ni plot (McLennan et al. 1993). Increased Cr/Ni values (and low Y/Ni), which are particularly pronounced in the samples from the Oštrc Formation, indicate a larger contribution of material from ophiolitic sources. UCC, average upper continental crust (McLennan 2001)