IsoplotR (version 0.14)

helioplot: Visualise U-Th-He data on a logratio plot or ternary diagram

Description

Plot U-Th(-Sm)-He data on a (log[He/Th] vs. log[U/He]) logratio plot or U-Th-He ternary diagram

Usage

helioplot(x, logratio = TRUE, show.central.comp = TRUE,
  show.numbers = FALSE, alpha = 0.05, contour.col = c("white", "red"),
  ellipse.col = rgb(0, 1, 0, 0.5), sigdig = 2, xlim = NA, ylim = NA,
  fact = NA, ...)

Arguments

x

an object of class UThHe

logratio

Boolean flag indicating whether the data should be shown on bivariate log[He/Th] vs. log[U/He] diagramme, or a U-Th-He ternary diagramme.

show.central.comp

show the geometric mean composition as a white ellipse?

show.numbers

show the grain numbers inside the error ellipses?

alpha

confidence cutoff for the error ellipses

contour.col

two-element vector with the fill colours to be assigned to the minimum and maximum age contour

ellipse.col

background colour of the error ellipses

sigdig

number of significant digits for the central age

xlim

optional limits of the x-axis (log[U/He]) of the logratio plot. If xlim=NA, the axis limits are determined automatically.

ylim

optional limits of the y-axis (log[Th/He]) of the logratio plot. If ylim=NA, the axis limits are determined automatically.

fact

three-element vector with the scaling factors of the ternary diagram if fact=NA, these will be determined automatically

...

optional arguments to the generic plot function

References

Vermeesch, P., 2010. HelioPlot, and the treatment of overdispersed (U-Th-Sm)/He data. Chemical Geology, 271(3), pp.108-111.

Examples

# NOT RUN {
data(examples)
helioplot(examples$UThHe)
dev.new()
helioplot(examples$UThHe,logratio=FALSE)
# }