Y-Cr: Petrotectonic Environments, Pearce, 1982

Discrimination diagram for characterizing island-arc tholeiiters on the basis of Y-Cr covariations.

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require('ggplot2');
 
classifydiag.basalts_cr_y_pearce <- function (wtp_data, ...)
{  
ds <- selectNames(wtp_data,c('Name','Cr_ppm','Y_ppm'))
 
pts <- data.frame(Name=ds$Name,
                  X = ds$Y_ppm,
                  Y = ds$Cr_ppm);
 
labels <- c("Y", "Cr");
 
ret <- c();
ret$type <- "diagram";
ret$points <- pts;
ret$labels  <- labels;
ret$limits <- c(1,250,10,2000);
ret$scale <- c('log','log');
 
return(ret);
}