TiV: Ti-V

In pvermees/GeoplotR: Toolbox for Geological Plots

Ti-V

Description

Ti-V tectonic discrimination diagram

Usage

TiV(
  Ti = NULL,
  V = NULL,
  type = c("Shervais", "LDA", "QDA"),
  ternary = FALSE,
  pch = 21,
  bg = NULL,
  show.labels = FALSE,
  short = TRUE,
  xlim = NULL,
  ylim = NULL,
  ...
)

Arguments

Ti	vector with Ti concentrations (ppm)
V	vector with V concentrations (ppm)
type	either 'LDA' for linear discriminant analysis, 'QDA' for quadratic discriminant analysis, or 'Shervais' for the nominal decision boundaries of Shervais (1982).
ternary	logical. If TRUE, produces a ternary diagram. 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.
xlim	x-axis limits
ylim	y-axis limits
...	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 labels for MORB, IAB and OIB.

References

Shervais, J.W., 1982. Ti-V plots and the petrogenesis of modern and ophiolitic lavas. Earth and Planetary Science Letters, 59(1), pp.101-118.

Examples

data(test,package='GeoplotR')
TiV(Ti=wtpct2ppm(test[,'TiO2']),V=test[,'V'],type='Shervais')

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