Controls the appearance of a triangle plot.
Right-click within an existing triangle plot and select Triangle Plot Options.
Reverses the normal counterclockwise orientation of the numbers on the axes. Using this option the Y components will be mapped to the scale on the left, Z to the right.
By default DPlot forces X+Y+Z=100. Check this box if the range on each of the 3 components is 0-1.0.
USDA Soil Classification
If this option is checked, a triangle plot will be divided into the 12 soil texture classes defined by the US Department of Agriculture. The scaling assumes that the data’s X components (bottom scale) are sand percentage (0-100, or 0-1 if X+Y+Z=1 is checked) and Y components (right side of triangle) are clay percentage. The left side of the triangle is then silt percentage, forced to 100-(X+Y), or to 1.0-(X+Y) if X+Y+Z=1 is checked. If your data is instead X=sand and Y=silt percentages, to properly use this option you would first need to perform the transform Y=<range>-(X+Y) using the Operate on Y command on the Edit menu, where <range>=1.0 if X+Y+Z=1 is checked, and 100 otherwise.
IUGS Mafic Rock Classification
Draws boundaries and labels for IUGS (International Union of Geological Sciences) mafic rock. X axis is Olivine percentage, Y axis is Plagioclase percentage, and the inferred Z axis is Clinopyroxene percentage.
IUGS Ultramafic Rock Classification
Draws boundaries and labels for IUGS (International Union of Geological Sciences) ultramafic rock classifications. X axis is Clinopyroxene percentage, Y axis is Olivine percentage, and the inferred Z axis is Othopyroxene percentage.
Ab-An-Or Mineral Classification
Draws boundaries and labels for Albite-Anorthite-Orthoclase classification. X values are assumed to be Orthoclase percentage, Y values are assumed to be Anorthite percentage, and the inferred Z values are Albite percentage.
Related macro commands