Cascade Arc: Harker Diagrams
Item
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Title
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Cascade Arc: Harker Diagrams
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Description
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These Harker Diagrams show how major elements behave with increasing SiO2. TiO2, FeO (total), MgO, CaO, and P2O5 decrease with increasing SiO2, as they tend to crystallize early on in the cooling process. K20 and Na2O, however, are incompatible elements, so are not abundant in rocks with low SiO2 (wt%), as they are more stable in the melt until late in the crystallization process. Al2O3 is most compatible around 50% wt. SiO2, resulting in an inverse-U shaped curve.
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Subject
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Petrology 2015 Final Project: Convergent Margin
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Creator
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Devon Gorbey
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Source
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PetDB
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Mediator
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Tamara Carley
