Fig. 8From: K-feldspar rich shales from Jurassic bedded cherts in southeastern SloveniaBoström (1973) Fe2O3/TiO2 versus Al2O3/(Al2O3 + Fe2O3 + MnO) diagram; the analysed samples are close to terrigenous (T) or basaltic (B) material and far from a hydrothermal (H) end-member. Symbols same as for Fig. 4 Back to article page