I also tested the ternary diagram, as constructed here, extensively, and the data points plot exactly where they should be (see for instance the first three diagrams (Fig. As per Step 2, the triangle/ternary diagram has then been stretched, so it looks like an equilateral triangle again, which doesn’t affect the XY coordinate system behind it, as it is stretched with it.Ĭorrespondingly, due to the projection of A to Y (100 units), a factor of 0.86603 comes into play: tan(30°) = 0.57735 -> 0.57735 x 0.86603 = 0.5. Labels can also be customized to appear in specific locations and can use a variety of formats, fonts, and colors to. For ternary and piper diagrams, the labels can show data values or information from some other column in the data file. Data point labels can be shown on most plot types in Grapher. 7).īecause A is projected to 100 units (rather than 86.60…), the triangle is elongated and the angle of 30 degrees changes to 26.56505 degrees unfortunately, Excel doesn’t plot diagrams in scale to show this. Labels Page - Ternary and Piper Diagrams. 43 Relative abundance of C27, C28, and C29 regular steranes on a ternary diagram may be. Fig. Thus, we can use the normalized A component as Y without a trigonometric function (Fig. The Low hopane/sterane ratio of OF 1 indicate minor input of. In order to distinguish sedimentary environment it is customary to use triangular diagram(Fig.4). The ternary diagram ABC is projected into a cartesian XY graph.įor an equilateral triangle with a side length of 100 units (e.g., X-axis B-C side 0-100%), the height is 86.60254 units (i.e., Y-axis A).Ī is projected onto Y with 100 units. Extended tricyclic terpane ratios, C24 tetracyclic terpane/C26 tricyclic terpane ratios, and relative C29 sterane. In the case here, however, it is a different approach: n-Alkanes distributions, sterane ternary plot, presence of retene, high abundance of 1,2,5-TMN and 1,2,5,6-TeMN suggest. Talhar Shale and most of the samples of Sembar Formation. Biomarker data support Rock Eval results. You are right with the tan(30°) statement for calculating the X coordinate in an equilateral triangle/ternary diagram. Modified Van-Krevlen diagram and plot of T max versus TOC suggest type III kerogen in the Lower Goru and Sembar shales.
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