Figure 3. Section of the total alkali-silica diagram (TAS) showing the composition of glass shards from tephra layers and volcaniclastic deposits at Site 974 (electron microprobe data). TAS diagram classification according to
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Chemical classification of common volcanic rocks based on degree of silica saturation and CaO/K2O ratio
r - Use a diagram as background template in a plot - Stack Overflow
Geochemical discriminant diagram templates. Rock classification and series diagrams.