Interactive Utility
TAS Plot
Volcanic Classification
Total Alkali-Silica Diagram
An interactive TAS plot. Enter sample points as SiO2 and total alkalis (Na2O + K2O), and they will be plotted directly on the diagram.
SiO2 vs Na2O + K2O
Sample input table
Leave the table empty if you only want to inspect the TAS framework, or add your own samples to plot them directly.
| Label | SiO2 (wt, %) | Na2O + K2O (wt, %) |
|---|---|---|
Notes
Enter SiO2 and total alkalis for any volcanic sample. Labels are optional, but they help when several points are plotted together.
Inputs
SiO2 in % and Na2O + K2O in %. Decimal comma also works.
Framework
Next Step