| NaAlK {GCDkit} | R Documentation |
Assigns data for ternary diagram Na2O - Al2O3 -
K2O (mol. %)
into Figaro template (list 'sheet')
and appropriate values into 'x.data' and 'y.data'.
Calculates molar concentrations of alkalis and alumina, as well
as several molar ratios involving these three oxides.
NaAlK()
Ternary plot Na2O - Al2O3 - K2O (mol. %). Dashed lines define the following compositional fields (all oxides are expressed in mol. %):
| peraluminous + metaluminous (Shand 1943) | (Na2O+K2O)/Al2O3 < 1 |
| peralkaline (Shand 1943) | (Na2O+K2O)/Al2O3 > 1 |
| perpotassic | K2O/Al2O3 > 1 and K2O/Na2O > 1 |
| potassic | 1 < K2O/Na2O < 3 |
| ultrapotassic | K2O/Na2O >= 3 |
The molar ratio of K2O/Na2O >= 3, is equivalent to K2O/Na2O >= 2 in wt. %, i.e. to the definition of ultrapotassic igneous rocks by Foley et al. (1987).
sheet |
list with Figaro Style Sheet data |
x.data, y.data |
Al2O3, Na2O and K2O contents in mol. % transformed into 2D |
Na2O |
Na2O in mol. % |
Al2O3 |
Al2O3 in mol. % |
K2O |
K2O in mol. % |
(Na2O+K2O)/Al2O3 |
molecular ratio (Na2O+K2O)/Al2O3 |
K2O/Al2O3 |
molecular ratio K2O/Al2O3 |
K2O/Na2O |
molecular ratio K2O/Na2O |
Vojtěch Janoušek, vojtech.janousek@geology.cz
Foley S F, Venturelli G, Green D H, Toscani L (1987) Ultrapotassic rocks: characteristics, classification and constraints for petrogenetic models. Earth Sci Rev 24: 81-134 doi: 10.1016/0012-8252(87)90001-8
Shand (1943) Eruptive Rocks. John Wiley & Sons
classify figaro plotDiagram Shand
sampleDataset("sazava")
# Plot
plotDiagram("NaAlK", FALSE)
# Classify
classify("NaAlK")