NbZrY: Nb-Zr-Y

In pvermees/GeoplotR: Toolbox for Geological Plots

Nb-Zr-Y

Description

Nb-Zr-Y tectonic discrimination diagram

Usage

NbZrY(
  Nb = NULL,
  Zr = NULL,
  Y = NULL,
  type = c("Meschede", "LDA", "QDA"),
  ternary = TRUE,
  pch = 21,
  bg = NULL,
  show.labels = FALSE,
  short = TRUE,
  ...
)

Arguments

Nb	vector with Nb concentrations (ppm)
Zr	vector with Zr concentrations (ppm)
Y	vector with Y concentrations (ppm)
type	either 'LDA' for linear discriminant analysis, 'QDA' for quadratic discriminant analysis, or 'Meschede' for the nominal decision boundaries of Meschede (1986).
ternary	logical. If FALSE, produces a logratio plot. Only used if type is LDA or QDA.
pch	plot character. See ?par for details.
bg	fill colour for the plot character.
show.labels	logical. If TRUE, labels the discrimination fields.
short	logical. If TRUE, uses abbreviated labels for the discrimination fields.
...	additional arguments for the generic points function.

Value

if type='LDA' or type='QDA', a list with components class, posterior and x; otherwise a table with tectonic affinities.

References

Meschede, M., 1986. A method of discriminating between different types of mid-ocean ridge basalts and continental tholeiites with the Nb-Zr-Y diagram. Chemical geology, 56(3-4), pp.207-218.

Examples

data(test,package='GeoplotR')
NbZrY(Nb=test[,'Nb'],Zr=test[,'Zr'],Y=test[,'Y'])

pvermees/GeoplotR documentation built on Aug. 20, 2024, 4:45 a.m.