EAS105 Lecture Notes - Lecture 4: Amphibole, Biotite, Phanerite

• School: University of Alberta
• Department: Earth and Atmospheric Sciences
• Course: EAS105
• Professor: Fred Clrck

Document Summary

Chapter 8, p. 180-199 the changing earth 7e. Definition:- metamorphic rocks are pre-existing rocks of any type that. Dr. clark undergo recrystallization without melting in response to changed physical conditions; the mineralogical and textural changes are stable at the new conditions: mineralogy the mineralogy of a metamorphic rock reflects three principal factors, namely, original mineralogy. B & c. temperature and pressure the two must be considered together; the combination is the controlling factor. Certain metamorphic minerals begin to crystallize at certain t/p combinations (know the sequence in fig. Many of these minerals, such as garnet, staurolite, and kyanite, occur as porphyroblasts (e. g. garnet), defined: which are larger, well-formed crystals usually in a matrix of micas (eg, garnet: textures. Coarser crytals produce more uneven cleavage: schist - grain size continues to increase, with larger micas growing, so that the rock splits or even crumbles along very irregular surfaces.