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Annealing Experiments of Albite Using Optical Microscope Heating Stage  

Park Byung-Kyu (Department of Earth and Environmental Sciences, Chonnam National University)
Kim Yong-Jun (Department of Earth and Environmental Sciences, Chonnam National University)
Kim Youn-Joong (Division of Electron Microscopic Research, Korea Basic Science Institute)
Publication Information
Journal of the Mineralogical Society of Korea / v.18, no.4, 2005 , pp. 289-299 More about this Journal
Abstract
Annealing experiments on albite powders, thin sections, and TEM specimens have been performed utilizing an optical microscope heating stage. Sample orientations were determined by optical microscope and XRD, and then confirmed by TEM diffraction patterns. Partial melting of samples occurred at $1030^{\circ}C$-l2 hr for powder, but at $1060^{\circ}C$-12 hr for TEM specimen. It is difficult to get TEM images of albite microstructures above this temperature due to thickening and the amorphous phase of the melted part. Correlative studies between optical microscopy and TEM indicated that the $1050^{\circ}C$-12 hr annealing in ambient condition was most adequate to observe tweed microstructures in albite through TEM. In situ TEM heating experiments for direct observation of tweed microstructures in albite may require annealing at slightly higher temperatures than $1050^{\circ}C$ considering the high vacuum condition inside TEM.
Keywords
Albite; Annealing; Melting; Tweed microstructure;
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