PeceTaylor {GCDkit}R Documentation

SiO2-K2O diagram (Peccerillo + Taylor 1976)

Description

Assigns data for SiO2 vs. K2O diagram into Figaro template (list 'sheet') and appropriate values into 'x.data' and 'y.data'

Usage

PeceTaylor()

Details

Diagram in SiO2 vs. K2O space, proposed by Peccerillo & Taylor (1976), defines the following fields:

Tholeiite Series
Calc-alkaline Series
High-K Calc-alkaline Series
Shoshonite Series

Field boundaries were linearly extrapolated up to 75% of SiO2 between 'Calc-alkaline Series' and 'High-K Calc-alkaline Series', and up to 70% of SiO2 between 'High-K Calc-alkaline Series' and 'Shoshonite Series'. To employ boundaries as originally defined by Peccerillo & Taylor (1976), change the value of variable 'extrapolated' to 'FALSE' in the file '[R-root] \ library \ GCDkit \ Diagrams \ Classification \ PeceTaylor.r'. Also note that the second value for the middle boundary (i.e. [52,1.5]) is in the original paper obviously misquoted as 1.3 .

Rocks with composition falling beyond defined boundaries are labeled 'undefined' by the 'classify' function.

For comparison with similar diagrams used by other authors see Rickwood (1989).

Value

sheet

list with Figaro Style Sheet data

x.data

SiO2 weight percent

y.data

K2O weight percent

Author(s)

Vojtech Erban, vojtech.erban@geology.cz
& Vojtech Janousek, vojtech.janousek@geology.cz

References

Peccerillo A & Taylor S R (1976) Geochemistry of Eocene calc-alkaline volcanic rocks from the Kastamonu area, Northern Turkey. Contrib Mineral Petrol 58: 63-81 doi: 10.1007/BF00384745

Rickwood P C (1989) Boundary lines within petrologic diagrams which use oxides of major and minor elements. Lithos 22: 247-263 doi: 10.1016/0024-4937(89)90028-5

See Also

classify figaro plotDiagram

Examples

#Within GCDkit, the plot is called using following auxiliary functions:
#To Classify data stored in WR (Groups by diagram)
classify("PeceTaylor")

#To plot data stored in WR or its subset (menu Classification)
plotDiagram("PeceTaylor", FALSE)

[Package GCDkit version 3.00 Index]