foliation and types
DESCRIPTION
FOLIATION AND TYPESTRANSCRIPT
IN THE NAME OF ALLAH IN THE NAME OF ALLAH THE MOST BENEFICIENT THE MOST BENEFICIENT
ANDAND THE MOST MERCIFUL.THE MOST MERCIFUL.
Presented To:Presented To:Prof. Dr. Mirza Shahid BaigProf. Dr. Mirza Shahid Baig
Presented By:Presented By:
FAZAL ELAHI
Roll # 179
BS. Applied Geology
5th Semester
Evening “B”
2008-2012
Presentation TopicPresentation Topic
FOLIATION
FoliationFoliation
The layered structure common to metamorphic rocks. Planar arrangement of structural or textural
features in any rock type, but particularly that resulting from the alignment of constituent mineral grains of a metamorphic rock along straight or wavy planes. Foliation commonly occurs parallel to original bedding, but it may not be obviously related to any other structural direction. Foliation is exhibited most prominently by sheety minerals, such as mica or chlorite
Formation MechanismsFormation Mechanisms• Foliation is usually formed by the preferred
orientation of minerals within a rock • Alignment of tabular minerals in
metamorphic rocks, igneous rocks and intrusive rocks may form a foliation. Typical examples of metamorphic rocks include porphyroblastic schists
• Foliation may be formed by realignment of micas and clays via physical rotation of the minerals within the rock
orthogneiss, orthogneiss,
Schematic showing foliation development by pure and Schematic showing foliation development by pure and simple shear. simple shear.
THANKSTHANKS