You only need to know the major element chemical composition of the rock sample being studied. The use of TAS diagram is very simple and straightforward. These coordinates are shown on the second diagram which you can use to construct your own diagram if you wish. Igneous Rocks: A Classification and Glossary of Terms: Recommendations of the International Union of Geological Sciences Subcommission on the Systematics of Igneous Rocks (2nd edition). I made the schemes using the coordinates provided in the following book: Le Maitre, R. The DPlot file for this picture is available here (right-click and select Save As).The classification of igneous rocks is largely based on two diagrams: QAPF diagram for plutonic rocks (formed in the crust) and TAS diagram for volcanic rocks. Once this graph is created you can add your own data with the Edit Data command on the Edit menu or, if your data exists in a file, with the Append command on the File menu (as opposed to the Open command). Once done your plot should resemble something like this: The anchor point in data space for the notations shown below, with the justification set to Center and Middle in all cases, is: You can either drag the notes to the desired location, or specify their location in terms of data space initially (no dragging required). Labels for the various regions are added with the Add/Edit Note command on the Text menu (or by clicking the Note button on the toolbar). You can easily enter these points using the Edit Data command on the Edit menu. The boundaries between the 3 regions will be created with normal DPlot "curves". Yes, I know you don't really want that, but follow along anyway. Schmid's Descriptive nomenclature and classification of pyroclastic deposits and fragments: Recommendations of the International Union of Geological Sciences Subcommission on the Systematics of Igneous Rocks. You want to show the boundaries for tuffs and ashes from R. That option only applies to new data you can either uncheck that option or later select the Symbol/Line Styles command on the Options menu to use a line style other than "None".Īn example is always nice, so here is an example: Most likely the Always force symbols on/lines off for triangle plots option is checked. Take a look at the General command on the Options menu. Your "but the line disappears" comment is due to a default setting with regard to triangle plots. For an ultramafic scale and blue boundary lines, you should now see something that looks a bit like this (minus your data):Īs to the more general question, you can create whatever boundaries and labels you want, save those to a DPlot file, then later open that file and import and/or add that data to your file. Select the appropriate options and click OK. You'll be presented (with version 2.2.6 or later) with this dialog box: Then right-click again on the plot and select Triangle Plot Options (again, the same option is available on the Options menu). If the plot you have on the screen is not a triangle plot, first right-click on the graph and select Triangle Plot (or, equivalently, click on the Options menu, then Linear/Log Scaling, then Triangle Plot). First, yes you can plot mafic and ultramafic rock classifications starting with version 2.2.6. I have tried plotting field boundary coordinates in X-Y space and then selecting triangle plot, but the line disappears.Ī: In general you can plot any sort of boundaries and/or labels you want with a ternary plot (aka triangle plot, depending on what world you work in), and your "but the line disappears" is easily explained. Is it possible to define field classification boundaries, other than those in the soil plot, so that rock classifications can be plotted? I am using the standard IUGS rock classification diagrams for felsic, mafic and ultramafic rocks which are based on three minerals each. Q: I work with mineralogical data, some of which is used for rock classification.
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