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Earth, Planets and Space
Figure 6 | Earth, Planets and Space

Figure 6

From: Polybaric crystallization differentiation of H2O-saturated island arc low-K tholeiite magmas: a case study of the Izu-Oshima volcano in the Izu arc

Figure 6

Projection of normative composition of liquids. Projection of normative composition of liquids (aphyric lavas and groundmasses of porphyritic lavas) on the pseudo-ternary diagram after the schemes of Tormey et al. (1987) and Grove (1993). The olivine-plagioclase-clinopyroxene cotectic at 0.1 MPa is from Walker et al. (1979); the olivine-plagioclase-clinopyroxene cotectic at 200 MPa is from Berndt et al. (2005); and the orthopyroxene-plagioclase-clinopyroxene cotectic at 400 MPa is from Hamada and Fujii (2008). The addition of H2O expands the stability field of clinopyroxene at a given pressure, resulting in a shift in the cotectic curve toward the olivine apex.

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