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. %):

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 Na2O

, Al2O3 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 3.00 Index]