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http://hdl.handle.net/2122/8158
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 | Journal: | Journal of non-crystalline solids | Series/Report no.: | /358 (2012) | Publisher: | Elsevier Science Limited | Issue Date: | 2012 | DOI: | 10.1016/j.jnoncrysol.2012.04.010 | Keywords: | Heterogeneous nucleation; Cooling rate; Platinum; Olivine; Clinopyroxene | Subject Classification: | 04. 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. |
Appears in Collections: | Article published / in press |
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