Pearce1976 {GCDkit}R Documentation

LDA1-LDA2 plot after Pearce (1976)

Description

LDA1-LDA2 plot after Pearce (1976) as implemented by Vermeesch (2006).

Usage

Pearce1976(major = WR[, c("SiO2", "Al2O3", "TiO2", "CaO", "MgO", "MnO", "K2O", "Na2O")], 
    pch = labels[, "Symbol"], col = labels[, "Colour"], cex = labels[, "Size"], 
    show.labels = TRUE, short = TRUE, xlim = c(-10, 8), ylim = c(-8, 10), ...)

Arguments

major

selected major element oxides (in wt. %)

pch

plotting symbol - see ?par for details

col

plotting symbol colour

cex

plotting symbol size

show.labels

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

short

use short labels when using the additional argument show.labels=TRUE

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.

Pearce1976.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 (1976) Statistical analysis of major element patterns in basalts. J Petrol 17:15-43 doi: 10.1093/petrology/17.1.15

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

Examples

sampleDataset("atacazo")
out <- Pearce1976()
print(out$class)

print(out)

[Package GCDkit version 6.3.0 Index]