Metamorphic rocks Today’s Chapter 8: Lecture

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Presentation transcript:

Metamorphic rocks Today’s Chapter 8: Lecture Classification metamorphic rocks Texture & Composition 2) Contact metamorphism 3) Metamorphism along faults 4) Regional metamorphism 5) Metamorphism & plate tectonics

Agents of metamorphism Heat Pressure (stress) Chemical activity (fluids) Metamorphic environments Contact Cataclastic Regional

Common metamorphic rocks gneiss slate mica schist marble quartzite

Common metamorphic rocks Foliated rocks

Common metamorphic rocks Foliated rocks slate Slate

Fig. 8.13 W. W. Norton

Fig. 8.10 W. W. Norton

Fig. 8.09 W. W. Norton

Slate Very fine-grained, Platy minerals (Clays, Micas) Foliated rocks Common metamorphic rocks Foliated rocks slate Slate Very fine-grained, Platy minerals (Clays, Micas) COLORS: CONTAINS: black slate organic material red slate iron oxide green slate chlorite

Slate TILTING Foliated rocks Original shale Original shale Common metamorphic rocks Foliated rocks slate Original shale Slate TILTING Original shale Rock cleavage

Slate Foliated rocks Original shale Bedding planes Common metamorphic rocks Foliated rocks slate Slate Original shale Bedding planes Rock cleavage

Slate Foliated rocks Foliated rocks Original sedimentary layering Common metamorphic rocks Foliated rocks slate Foliated rocks 1) Common metamorphic rocks Slate Original sedimentary layering

Fig. 8.12a W. W. Norton

Veins developed in slate

Phyllite Platy minerals(e.g. muscovite or chlorite Foliated rocks Common metamorphic rocks phyllite Phyllite Fine- to medium-grained Platy minerals(e.g. muscovite or chlorite Phyllite Slate

Foliated rocks Common metamorphic rocks phyllite Phyllite

Biotite Mica

Phyllite Foliated rocks Original sedimentary layers Common metamorphic rocks phyllite Original sedimentary layers Phyllite

Schist Strongly foliated Easy to split in slabs Foliated rocks 1) Common metamorphic rocks schist Schist Coarser-grained Strongly foliated Easy to split in slabs Pioneer Range, Idaho

Composition plus texture Foliated rocks Common metamorphic rocks schist Mica Schist Rock name: Composition plus texture

Schist Foliated rocks Segregation of minerals into bands Quartz Micas Common metamorphic rocks schist Schist Segregation of minerals into bands Quartz Micas

Schist Quartz Mica

Schist Foliated rocks Segregation of minerals into bands Begins. Common metamorphic rocks schist Schist Segregation of minerals into bands Begins.

Schist Appearance of new minerals Foliated rocks Foliated Rocks Common metamorphic rocks Foliated Rocks schist Appearance of new minerals Schist Amphibole

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