TiZrY {GCDkit}R Documentation

Pearce and Cann (1973) Zr - Ti/100 - 3Y LDA/QDA)

Description

Linear and quadratic discrimination-analysis-based versions of the ternary diagram Zr - Ti/100 - 3Y (Pearce and Cann 1973)) for geotectonic discrimination of igneous rocks of Vermeesch 2006.

Usage

TiZrY(Zr = WR[, "Zr", drop = FALSE], Ti = WR[, "Ti", drop = FALSE], 
    Y = WR[, "Y", drop = FALSE], 
    type = c("Pearce", "LDA", "QDA"), ternary = TRUE, show.labels = TRUE,
    short = TRUE, ...)

Arguments

Zr

vector of Zr concentrations (ppm)

Ti

vector of Ti concentrations (ppm)

Y

vector of Y concentrations (ppm)

type

either 'LDA' for linear discriminant analysis, 'QDA' for quadratic discriminant analysis, or 'Pearce' for the nominal decision boundaries of Pearce and Cann (1973)

ternary

logical. If FALSE, produces a logratio plot. Only used if type is LDA or QDA

show.labels

logical. If TRUE, labels the discrimination fields

short

logical. If TRUE, labels the discrimination fields

...

additional arguments for the generic points function.

Details

This plot comes from the GeoplotR collection available online at https://isoplotr.es.ucl.ac.uk/geoplotr.

TiZrY.png

Value

A list with tectonic affinities.

Note

This plot is not Figaro-compatible.

Author(s)

Pieter Vermeesch, p.vermeesch@ucl.ac.uk,

GCDkit implementation by Vojtěch Janoušek, vojtech.janousek@geology.cz

References

Pearce JA & Cann JR (1973) Tectonic setting of basic volcanic rocks determined using trace element analyses. Earth Planet Sci Lett 19: 290-300. doi: 10.1016/0012-821X(73)90129-5

Vermeesch P (2006) Tectonic discrimination diagrams revisited. Geochem Geophys Geosyst 7:Q06017 doi: 10.1029/2005GC001092

See Also

Cann

Examples

sampleDataset("atacazo")

out <- TiZrY(type="QDA")
print(out$class)

print(out)

[Package GCDkit version 6.3.0 Index]