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Rohinee posted an Question
January 28, 2021 • 15:52 pm 5 points
  • IIT JAM
  • Geology (GG)

Doubt in these acf and akf diagrams

Please explain me the doubts in this page related to ACF and AKF diagrams

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    Asif ali best-answer

    If you solve ACF for K-Feldspar. KAlSi3O8 then Let's Assume 2KAlSi3O8 = K2O+Al2O3+6Sio2. using this in A = 1+0-0-1 =0. If you taking one molecules only KAlSi3O8 = 1/2K2O+1/2Al2O3+ some SiO2. so use in A = 0.5+0-0-0.5=0

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    Saurabh 1 Best Answer

    Kindly see the figure attached...

    cropped2422973452612867431.jpg
    cropped6626642019115353512.jpg
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    okay I understood the KAl2SiO4 splitting ...but how to do that one of Mg2SiO4 as I asked in the second part for the CMS system?

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    It will be plotted the same way you did for other diagrams, CMS is used primarily for ultramafic rocks(for more details kindly go through igneous petrology by Anthony Philpotts, good book for phase diagrams especially).

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