Tetrahedral Plots of the Phase Relations for Basalts |
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Authors: | Sven Maal?e and Richard N. Abbott Jr. |
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Affiliation: | (1) Department of Earth Sciences, Allegaten 41, 5007 Bergen, Norway;(2) Department of Geology, Appalachian State University, Boone, North Carolina |
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Abstract: | The phase relations of quaternary systems are generally represented by projections onto ternary compositional planes. Such projections often obscure relationships that would only be evident in a three-dimensional tetrahedral plot. The tetrahedral plot requires that compositions of the minerals and melts be transformed into Cartesian coordinates. It is shown here how this transformation is carried out. The application is demonstrated by tetrahedral plots of experimental melt compositions of partially molten lherzolite. Furthermore, the plot can be used to evaluate whether or not a particular basaltic composition represents a primary melt. The methods are applicable to any four-component system. |
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Keywords: | phase diagrams basalts primary magmas |
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