Tholeiitic vs. Calc-alkaline differentiation
{"Image DocumentName": "Tholeiitic vs. Calc-alkaline differentiation", "Image ImageDescription": "These Harkers represent > 1 volcano from each arc, but give the general idea nonetheless. C-A shows continually increasing SiO2 and lacks dramatic Fe enrichment (note Guatemala and PNG in FeO /MgO) TiO2 decr due to Fe-Ti oxide. CaO/Al2O3 should increase with Plag FX, but decreases in all types -> Cpx responsible for CaO. SiO2 doesn\u2019t show up in Harker, but it increases progressively in CALC-ALKALINE (although ~ constant in Thol) Figure From Winter (2001) An Introduction to Igneous and Metamorphic Petrology. Prentice Hall.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}