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 |
Vojtech Janousek, 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
#Within GCDkit, the plot is called using following auxiliary functions: #To Classify data stored in WR (Groups by diagram) classify("NaAlK") #To plot data stored in WR or its subset (menu Classification) plotDiagram("NaAlK", FALSE)