Afm Diagram. The tip lies at the end of the lever which. Afm diagram views 3 472 002 updated undefined 10 2020 afm diagram a three component triangular graph used to show how metamorphic mineral assemblages vary as a function of rock composition within one metamorphic facies.
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To plot a rock on the acf diagram the chemical analysis of the rock is first recalculated to molecular proportions by dividing the molecular weight of each oxide constituent by the molecular. Besides sio 2 the five most abundant oxides found in metamorphic rocks are al 2 o 3 cao feo mgo and k 2 o. The tip lies at the end of the lever which.
A alkali sodium and potassium oxides f iron oxides m magnesium oxide bt tholeiitic basalt fb ferro basalt abt tholeiitic basaltic andesite at tholeiitic andesite d dacite r rhyolite b.
The afm diagram a ternary diagram between the alkali fe and mg oxides used to distinguish the calc alkaline magma series from the tholeiitic magma series. The three components plotted on afm diagrams are derived from a tetragonal diagram with species al 2 o 3 k 2 o 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 2 o 3 cao feo mgo and k 2 o. The tip lies at the end of the lever which.
