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Dear All, I have recently come across the "Isocon diagram", introduced by James Grant (1986) as an illustration of Gresen's equation and since used as a standard diagram (e.g. Hippert 1996 JSG) to illustrate mass gain or loss in a chosen rock that may be deformed or metasomatically changed. It occurs to me that the diagram seems to be overdefined. In order to plot many elements on the same diagram the element concentrations are generally randomly scaled so that the horizontal axis appears pretty meaningless. I started thinking that one could normalise all elements to 1 or something thus freeing the horizontal axis to plot something else (e.g. atomic radius or something other related to mobility). Am I thinking in a completely usless direction ? I am a bit nervous as it seems such a standard diagram... Pity us mere mortal beings are usually resticted with our imagination to 2D so that we have to think about things like this at all... Kurt -------------------------------- Kurt Stuewe Institut fuer Geologie und Palaeontologie Universitaet Graz, Heinrichstr 26. A-8010 Graz Austria email: [log in to unmask] Fax: 0043-316-380-9870 ph: 0043-316-380-5682 http://wegener.kfunigraz.ac.at --------------------------------