LABORATORY SEVEN –Metamorphic rocks, Processes and Resources

Laboratory Manual in Physical Geology by The American Geological Institute (AGI) and the National Association of Geoscience Teachers (NAGT); Richard M. Busch, Editor; 6th Edition, 2003.

METAMORPHIC ROCKS

PARENT ROCK (protolith) (Igneous, Sedimentary, Metamorphic)

COMMON METAMORPHIC-ROCK FORMING MINERALS (Quartz, Feldspar (K-Feldspar, Plagioclase), Muscovite, Biotite, Garnet, Tourmaline, Calcite, Dolomite, Serpentine, Talc, Kyanite, Sillimanite, Hornblende)

METAMORPHIC PROCESSES

TWO SCALES (TYPES OF METAMORPHISM)

CONTACT

REGIONAL

MINERALOGICAL COMPOSITION

MINERALOGICAL CHANGES DURING METAMORPHISM

1- RECRYSTALLIZATION

2- NEOMORPHISM [DEVELOPMENT OF NEW CRYSTALS (CRYSTALLIZATION)]

3- METASOMATISM

METAMORPHIC TEXTURES

-FOLIATED

TYPES OF FOLIATION

SLATY ROCK CLEAVAGE

PHYLLITIC TEXTURE

SCHISTOSITY

GNEISSIC BANDING

-NON-FOLIATED

CRYSTALLINE /MICROCRYSTALLINE

Sandy

Glassy

OTHER TEXTURAL FEATURES

Stretched or shared grains

Porphyroblastic texture

Hydrothermal veins

Lineations

CLASSIFICATION AND IDENTIFICATION OF METAMORPHIC ROCKS (Slate, Phyllite, Schist, Gneiss, Marble, Quartzite, Metaconglomerate, etc., Figure 7.5, p. 124)

SEDIMENTARY ROCKS