Abstract
Oxygen isotope fractionation factors for SiO 2 and Al 2 SiO 5 polymorphs have been calculated by means of the modified increment method. The results suggest that the 18 O is depleted in the high pressure forms (i.e. the more dense phases). The effect of crystal structure on isotopic partitioning in polymorphic phases is important, because the cation-oxygen interatomic distances and coordination numbers can change due to compression or thermal expansion in geological processes
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