Mafic vs. Felsic T-Chart Feature Mafic Felsic Ma - magnesium, Fe - iron Fel - feldspar, Si - silica Thinner (low viscosity) Thicker (high viscosity) Low silica content High silica content High in ferromagnesians Low in ferromagnesians (basaltic) (silicic, rhyolitic, granitic) Hotter Cooler Denser (heavier Fe, Mg) Less dense Darker colored rocks Lighter colored rocks Smooth flowing eruptions Explosive eruptions (gases bubble escape) (gases are trapped in magma) Volcano types: Volcano types: - shield - composite cone (Stratovolcano) - lava plateau - volcanic domes - flood basalts - (like toothpaste oozing out) - cinder cones - cinder cones water mixed in causes explosiveness Features: - pillow lava - pahoehoe + aa - columnar joints

Mafic vs Felsic T-Chart

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