Thus the evolution line can only move horizontally, and the farther it moves to the right the less feldspar/lithics there is and the more matrix, until on the right line all feldspar/lithics would be turned into matrix.įinally, we transport and sort the sediment, such as at the shore, where quartz remains on the beach while the matrix (shale) drifts off shore to the shelf. And since quartz does not weather, its abundance must remain at 25%. Since there is no sorting, the feldspar/lithics and their weathering product, matrix, remain mixed with the quartz. If it has 25% quartz then we plot granite on the left side at the 25% level.Īs the granite weathers, feldspar/lithics turn into matrix, so the composition moves toward the right side, the matrix side. What paths would the components take on the diagram?Īnalysis: A granite is an igneous rock, and therefore has no matrix. Question 3: > Now transport and sort the sediment. How would the composition change on the diagram? Question 2: > Now assume the granite is going to weather, but not be transported or sorted. Question: > Now, assume a granite has 25% quartz and the rest feldspar and lithics (mafic minerals). Note quartz is at the top, but feldspar and lithics are combined in the lower left this is because both of these weather into something else - matrix. Look at apexes of the ternary diagram to the right. Answers to How Granite Would Evolve on a Ternary Diagram
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