Afm Diagram Geology. Return to the main menu and select makemygrid. Besides sio2 the five most abundant oxides found in metamorphic rocks are al2o3 cao feo mgo and k2o.
Feot mgo binary diagram of miyashiro 1974 distinguishing between tholeiitic and calc alkaline igneous rocks. Commonly used chemographic projections include acf akf and afm example shown here diagrams. Choose p t dialogue box.
Also highly recommended is steve nelson s triangular plots in metamorphic petrology.
Besides sio 2 the five most abundant oxides found in metamorphic rocks are al 2 o 3 cao feo mgo and k 2 o. A al 2 o 3 3 k 2 o f feo m mgo using these parameters one can grid off the afm diagram with the vertical scale represented by the normalized values for the a parameter al 2 o 3 3 k 2 o al 2 o 3 3 k 2 o feo mgo. Sio2 k2o peccerillo taylor 1976 pecetaylor g sio 2. 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.
