Original paper
Microstructural characterisation of pseudotachylytes in quartzitic rocks by electron microscopy - first results
Bestmann, Michel; Gotze, Jenz; Cotza, Gianluca; de Wall, Helga; Goken, Mathias
published: 6/1/2008
DOI: 10.1127/1864-5658/08/9501-0017
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ArtNo.: ESP150009501007
Abstract
Localised fault zones (0.5-2 mm) were analysed within a quartzitic host rock (with 5-10 vol% muscovite) of the "SchneebergZug" from the AustroalpineUnit (Southern Tyrol, Italy). They typically occur in fault and injectionvein association. Flow fabrics, spherulitic/microlitic and corrosion microstructures indicate the presence of a high temperature melt and characterize these quartzitic fault zones as pseudotachylytes. Low temperature quartz microstructures in the adjacent host rock indicate ambient condition of about 250°C.