Fig. 4
Binary/ternary plots showing the relations between the concentration (in weight percent of oxides) of a K\(_2\)O vs. CaO, b CaO/BaO vs. CaO/SrO, c Fe\(_2\)O\(_3\)/CaO vs. Fe\(_2\)O\(_3\)/SiO\(_2\), d Al\(_2\)O\(_3\)/CaO vs. Al\(_2\)O\(_3\)/SiO\(_2\), e normalised ratios Al\(_2\)O\(_3\)/SiO\(_2\) vs. TiO\(_2\)/Al\(_2\)O\(_3\) vs. SiO\(_2\)/CaO and f Cl vs. CaO