PeceTaylor {GCDkit} | R Documentation |
Assigns data for SiO2 vs. K2O diagram into Figaro template (list 'sheet
') and appropriate values into 'x.data
' and 'y.data
'
PeceTaylor()
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).
sheet |
list with Figaro Style Sheet data |
x.data |
SiO2 weight percent |
y.data |
K2O weight percent |
Vojtech Erban, vojtech.erban@geology.cz
& Vojtech Janousek, vojtech.janousek@geology.cz
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
#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)