Microstructure of selected metamorphic rock types - application of petrographic image analysis

0357076 - ÚSMH 2011 RIV CZ eng J - Journal Article
Šachlová, Š. - Schenk, Vladimír - Schenková, Zdeňka
Microstructure of selected metamorphic rock types - application of petrographic image analysis.
Acta geodynamica et geomaterialia. Roč. 7, č. 4 (2010), s. 431-443. ISSN 1214-9705. E-ISSN 2336-4351
R&D Projects: GA MŠMT(CZ) LC506
Institutional research plan: CEZ:AV0Z30460519
Keywords : metamorphic rock * texture * structure
Subject RIV: DB - Geology ; Mineralogy
Impact factor: 0.452, year: 2010
www.irsm.cas.cz/abstracts/AGG/04_10/4_Sachlova.pdf

Microscopic techniques, such as polarising microscopy and scanning electron microscopy with energy dispersive spectrometer (SEM/EDS), were used in combination with petrographic image analysis with the aim of a quantitative determination of the mineral composition, rock microstructure, and degree of metamorphism of selected quartz-rich metamorphic rock types. Sampled orthogneiss rock types are mainly composed of feldspar, quartz, biotite, and amphibole. The grains are less isometric, elongated, having smooth boundaries, and showing a weak preferential orientation. The deformation and recrystallization characteristics of quartz indicate high-temperature recrystallization (the grain boundary migration recrystallization mechanism). Schist and phyllite rock types are preferentially very-fine to fine-grained, showing a strong shape preferred orientation. Their sedimentary origin was indicated by the presence of graphite.
Permanent Link: http://hdl.handle.net/11104/0195439