A triangular plot is used to graph the ratios of three separate variables in an equilateral triangle. The plot is known to be convenient because three variables can be graphed in a two dimensional plot. Triangular plots are most often used in geologic studies. The example triangular plot shows the chemical analysis of igneous rock. The three variables graphed, tholeiitic, mantle magma, and calc-alkaline, are easily identifiable.
http://www.lithoprobe.ca/media/slideset/slides/tools20.asp.
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