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Authors: Mollo, S.* 
Iezzi, G.* 
Ventura, G.* 
Cavallo, A.* 
Scarlato, P.* 
Title: Heterogeneous nucleation mechanisms and formation of metastable phase assemblages induced by different crystalline seeds in a rapidly cooled andesitic melt
Issue Date: 2012
Series/Report no.: /358 (2012)
DOI: 10.1016/j.jnoncrysol.2012.04.010
Keywords: Heterogeneous nucleation; Cooling rate; Platinum; Olivine; Clinopyroxene
Subject Classification04. Solid Earth::04.01. Earth Interior::04.01.04. Mineral physics and properties of rocks 
Abstract: Pt-capsules loaded with a Pt-coil and two crystalline seeds immersed into an andesitic melt were rapidly cooled from 1300 to 1100 °C with a rate of 3 °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.
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