The image below is used for educational purposes. (As I don't have a good hand sample of a Diorite - as an example of an Intermediate Igneous Rock - I had to use a Porphyritic Andesite, from the "Campus Andesite", a shallow Eocene intrusion underlying the University of Texas-El Paso campus.)
Figure 1.
Below (Figures 2 and 3) are descriptions of the Mafic and Felsic "End Members" of this range.
Figure 2. Gabbro - unknown source.
Figure 3. Granite - Pennsylvanian Elberton Granite.
Figure 4. Ultramafic Mantle Xenolith - Quaternary Maar eruption.
At least two more Bowen Reaction Series posts are planned for the coming days. Repetition helps enforce memorization, while different articulations may induce different insights.
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