![afm ternary diagram afm ternary diagram](https://images.squarespace-cdn.com/content/v1/549dcda5e4b0a47d0ae1db1e/1553131012789-ETSMY7N9Q1PTQES5D8H6/ternary_diagram_final.png)
As in ACF diagrams, tielines connect minerals which coexist in equilibrium. The minerals quartz and albite are assumed to be present in the rocks and are not shown on the diagram. Models of Magmatic Evolution hypothetical set of related volcanics. Data compiled by Rick Conrey (personal communication). AFM diagram for Crater Lake volcanics, Oregon Cascades. Each of these components has to be modified slightly to account for the presence of other, minor components in the rock, leading to: A (Al 2O 3 - 3K 2O) F (FeO - TiO 2 - Fe 2O 3) and M (MgO). Ternary Variation Diagrams Example: AFM diagram (alkalis-FeO-MgO) Figure 8.3. The components of the diagram are thus A (Al 2O 3), F (FeO), and M (MgO), with the projection geometry being accommodated on specially scaled axes. A three-component, triangular graph used to show how metamorphic mineral assemblages vary as a function of rock composition within one metamorphic facies.
![afm ternary diagram afm ternary diagram](https://pubs.rsc.org/image/article/2021/RA/d0ra10720d/d0ra10720d-f1_hi-res.gif)
sample is in disequilibrium or it happens to be located on a univariant curve). Be able to explain the meaning of crossing tie lines (i.e. Be able to determine the stable mineral assemblage on a ternary given a bulk rock composition. Mineral and rock compositions plotting within this diagram are projected on to the Al 2O 3-FeO-MgO face from either the muscovite or K-feldspar point on the Al 2O 3-FeO edge. ternary (AFM is good for Fe-Mg solid solutions like Garnet and Biotite). The three components plotted on AFM diagrams are derived from a tetragonal diagram, with species Al 2O 3, K 2O, FeO, and MgO, and are ideal for showing mineral assemblage variations as a function of the composition of pelites. Besides SiO 2, the five most abundant oxides found in metamorphic rocks are Al 2O 3, CaO, FeO, MgO, and K 2O. A three-component, triangular graph used to show how metamorphic mineral assemblages vary as a function of rock composition within one metamorphic facies.