• Recrystallization of grains under pressure -- diagram
• Formation of foliation -- diagram
• Foliation in slate
• Foliation and original bedding -- exposure in slate quarry
• Slate -- hand specimen
• Slate -- photomicrograph showing parallel orientation of grains
• Schist -- hand specimen
• Foliated texture -- mica schist: photomicrograph (in polarized light) of metamorphic rock, showing parallel alignment of interlocking mica and pyroxene grains doe to recrystallization under pressure. Foliated texture is typical of many metamorphic rocks.
• Gneiss -- hand specimen
• Folded gneiss
• Quartz sandstone -- hand specimen. Parent material of quartzite.
• Quartzite -- hand specimen.
• Stretched pebble conglomerate -- metamorphosed by shearing and pressure
• Sheared peridotite and matrix -- Hurdygurdy Creek
• Detail of sheared peridotite -- note tectonic lensing. Hurdygurdy Creek
• Undeformed granite -- contains xenoliths
• Gneiss -- formed by shearing of granite. Note deformed xenolith.
• Metamorphism by ion rich water -- new minerals (garnets) formed in granite and gneiss along veins
• Metamorphic changes with increasing pressure and temperature -- table
• Metamorphic facies -- pressure and temperature stability fields for various metamorphic rocks
• Contact metamorphic aureole -- diagram
• Contact metamorphic changes in rock types -- cross section
• Contact metamorphism around dike -- aerial photograph
• Regional metamorphism and subduction -- diagram
• Regional metamorphic environments in plate tectonics -- diagram
• Metamorphic facies related to plate tectonic environments -- diagram

[top of page] [igneous rocks] [sedimentary rocks]

HSU Home Page

Geology Home Page

Geology 108 Home Page

Geology 108 Topic Index