Lecture 16 metamorphism

Today’s Lecture Chapter 8: Metamorphic rocks 1) 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 mica schist quartzite slate marble 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 Common metamorphic rocks Foliated rocks slate Slate Very fine-grained, Platy minerals (Clays, Micas) COLORS: black slate red slate green slate CONTAINS: organic material iron oxide chlorite Common metamorphic rocks Foliated rocks slate Original shale Slate TILTING Rock cleavage a n i ig r O le a h ls Metamorphism and plate tectonics Hydrothermal vents at mid-ocean ridges Fig 08.27 W W Norton Fig 08.28 W W Norton p.218-219a original artwork by Gary Hincks Metamorphism and plate tectonics Subduction zones: Copper deposits Fig 08.25 W W Norton Metamorphism and plate tectonics Subduction zones: Serpentinite Fig 8.00 Stephen Marshak Fig 8.21 W W Norton