Original paper

Nanoscale phase equilibrium in a triggered lightning-strike experiment

Rietmeijer, Frans J.M.; Karner, Jim M.; Nuth, Joseph A.; Wasilewski, Peter J.

European Journal of Mineralogy Volume 11 Number 1 (1999), p. 181 - 186

23 references

published: Feb 11, 1999
manuscript accepted: Aug 19, 1998
manuscript received: Apr 3, 1998

DOI: 10.1127/ejm/11/1/0181

BibTeX file

ArtNo. ESP147051101006, Price: 29.00 €

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Abstract

Abstract We describe the nanometer-sized phases in millimeter-sized spheres produced in a triggered lightning-strike experiment characterized by ultra-high heating of ~ 108 degrees s-1 followed by similarly rapid quenching. The compositions of the aluminosilica glass spheres define a metastable Al2O3-SiO2 eutectic at ~ 40 wt. % A1203. The other phases are defined by the liquidus in the SiO2-Al2O3-Fe3O4 (wt %) phase diagram whereby hercynite formed at ~ 1750°C and domains of Fe3+-rich cordierite glass that represent a ternary minimum melt at ~ 1400°C with cotectic glasses linking this glass and spinel. Metastable eutectics are potentially important to understand the phase relationships due to flash heating events.

Keywords

pyrometamorphismfulguritestriggered lightning experimentexperimental petrologymetastable equilibriummineralogyanalytical electron microscopy