Microstructure of selected metamorphic rock types - application of petrographic image analysis
1.
SYSNO ASEP
0357076
Document Type
J - Journal Article
R&D Document Type
Journal Article
Subsidiary J
Článek ve WOS
Title
Microstructure of selected metamorphic rock types - application of petrographic image analysis
Author(s)
Šachlová, Š. (CZ) Schenk, Vladimír (USMH-B) Schenková, Zdeňka (USMH-B)
Source Title
Acta geodynamica et geomaterialia. - : Ústav struktury a mechaniky hornin AV ČR, v. v. i.
- ISSN 1214-9705
Roč. 7, č. 4 (2010), s. 431-443
Number of pages
13 s.
Publication form
www - www
Language
eng - English
Country
CZ - Czech Republic
Keywords
metamorphic rock ; texture ; structure
Subject RIV
DB - Geology ; Mineralogy
R&D Projects
LC506 GA MŠMT - Ministry of Education, Youth and Sports (MEYS)
CEZ
AV0Z30460519 - USMH-B (2005-2011)
UT WOS
000287014300004
Annotation
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.
