The Scrutinization Of Shock Textures By a FIB-TEM Technique

Details The Scrutinization Of Shock Textures By a FIB-TEM Technique The Scrutinization Of Shock Textures By a FIB-TEM Technique

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufm.v33b2217m&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #V33B-2217

Physics

3654 Ultra-High Pressure Metamorphism, 3656 Ultra-High Temperature Metamorphism, 3662 Meteorite Mineralogy And Petrology (1028, 6240), 3672 Planetary Mineralogy And Petrology (5410)

Scientific paper

Some meteorites record high-grade (shock) metamorphism. The shock metamorphism was induced by the collisions of planetesimal in the solar nebula. A part of the meteorites was deformed and heated by friction- induced melting along fractures or localized concentration of stress. Melting along fractures is called "gshock-melt veins"h. Silicate minerals in the shock-melt veins were transformed to their high-pressure polymorphs. These high-pressure polymorphs are extraterrestrial analogues of the phases in Earth"fs lower mantle. It is important to clarify their mechanisms of formation either by solid-state phase transformation and/or if also by localized fractional crystallization in mineral melt pockets to understand the evolution of Earth"fs lower mantle. In addition, the magnitude of the equilibrium pressure and the time scale of the dynamic events could be meaningfully estimated. However, successful investigations require precise surgical cutting and removal of the fine-scale assemblages in nm-thin slices to warrant successful TEM-investigation. We applied a combination technique of a focused ion beam (FIB) system and TEM to investigate the mechanisms. FIB-TEM technique allowed us to precisely study sub-micron textures. This resulted in novel findings and revision of previous models.

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