Journal
JOURNAL OF NON-CRYSTALLINE SOLIDS
Volume 358, Issue 12-13, Pages 1624-1628Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jnoncrysol.2012.04.010
Keywords
Heterogeneous nucleation; Cooling rate; Platinum; Olivine; Clinopyroxene
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Pt-capsules loaded with a Pt-coil and two crystalline seeds immersed into an andesitic melt were rapidly cooled from 1300 to 1100 degrees C with a rate of 3 degrees C/min at atmospheric pressure and air oxygen fugacity. Results show that the Pt-coil does not induce any heterogeneous crystallization process as well as iron diffusion process from the melt into the platinum substrate. In contrast, the presence of crystalline seeds in a solidifying andesitic melt significantly alters the phase assemblage, composition and texture of the new-forming crystals in response to a heterogeneous nucleation mechanism and the formation of metastable phases. (C) 2012 Elsevier B.V. All rights reserved.
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