ThTaHf: Th-Ta-Hf

In pvermees/GeoplotR: Toolbox for Geological Plots

Th-Ta-Hf

Description

Th-Ta-Hf tectonic discrimination diagram

Usage

ThTaHf(
  Th = NULL,
  Ta = NULL,
  Hf = NULL,
  type = c("Wood", "LDA", "QDA"),
  ternary = TRUE,
  pch = 21,
  bg = NULL,
  show.labels = FALSE,
  short = TRUE,
  ...
)

Arguments

Th	vector with Th concentrations (ppm)
Ta	vector with Ta concentrations (ppm)
Hf	vector with Hf concentrations (ppm)
type	either 'LDA' for linear discriminant analysis, 'QDA' for quadratic discriminant analysis, or 'Wood' for the nominal decision boundaries of Wood (1980).
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

Wood, D.A., 1980. The application of a Th-Hf-Ta diagram to problems of tectonomagmatic classification and to establishing the nature of crustal contamination of basaltic lavas of the British Tertiary Volcanic Province. Earth and Planetary Science Letters, 50(1), pp.11-30.

Examples

data(test,package='GeoplotR')
ThTaHf(Th=test[,'Th'],Ta=test[,'Ta'],Hf=test[,'Hf'])

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