ZrTi {GCDkit}R Documentation

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

Description

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

Usage

ZrTi(Zr = WR[, "Zr", drop = FALSE], Ti = WR[, "Ti", drop = FALSE], 
    type = c("Pearce", "Dilek", "LDA", "QDA"), ternary = FALSE, show.labels = TRUE, 
    short = TRUE, xlim = c(0, 1000), ylim = c(0, 25000), ...)

Arguments

Zr

vector of Zr concentrations (ppm)

Ti

vector of Ti concentrations (ppm)

type

either 'LDA' for linear discriminant analysis, 'QDA' for quadratic discriminant analysis, 'Pearce' for the nominal decision boundaries of Pearce and Cann (1973), or 'Dilek' for the nominal decision boundaries of Dilek and Furnes (2009)

ternary

logical. If TRUE, produces a ternary diagram. Only used if type is LDA or QDA.

show.labels

logical. If TRUE, labels the discrimination fields

short

logical. If TRUE, uses abbreviated labels for the polygonal decision fields with text strings

xlim

x-axis limits

ylim

y-axis limits

...

additional arguments to the generic points function, may include the logical argument show.labels which labels the fields in the diagram

Details

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

ZrTi.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

Dilek Y, Furnes H (2009) Structure and geochemistry of Tethyan ophiolites and their petrogenesis in subduction rollback systems. Lithos 113:1-20 doi: 10.1016/j.lithos.2009.04.022

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 <- ZrTi(type="LDA")
print(out$class)

print(out)

[Package GCDkit version 6.3.0 Index]