NaAlK {GCDkit}R Documentation

Na2O - Al2O3 - K2O (mol. %) diagram

Description

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.

Usage

NaAlK()

Details

Ternary plot Na2O - Al2O3 - K2O (mol. %). Dashed lines define the following compositional fields (all oxides are expressed in mol. %):

NaAlK.png

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).

Value

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

Author(s)

Vojtech Janousek, vojtech.janousek@geology.cz

References

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

See Also

classify figaro plotDiagram Shand

Examples

#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)

[Package GCDkit version 4.1 Index]