05_metamorphic_09_post

05_metamorphic_09_post - 05: Metamorphic Rocks...

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cture 5: cture 5: 1 05: Metamorphic Rocks Metamorphic rock : rock that  changed from its original form  into a new one, without first  becoming a melt or sediment. Dalradian Gneiss, Isle of Arran,  Scotland. Photo: P.L. Kresan
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cture 5: cture 5: 2 Why this is important Regionally extensive  metamorphic rocks  indicate past  episodes of plate  convergence and  mountain-building Fig. 8.21
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cture 5: cture 5: 3 Why this is important Assemblage of metamorphic minerals tells us about the  Assemblage of metamorphic minerals tells us about the  pressure and temperature conditions at the time of  pressure and temperature conditions at the time of  metamorphism, conditions we can never observe directly. metamorphism, conditions we can never observe directly. Photo: P.L. Kresan
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cture 5: cture 5: 4 Definition of Metamorphism Changes in mineral assemblage and rock texture that occur in  rocks  IN THE SOLID STATE  as a result of changes in  temperature, pressure, and effects of chemically reactive fluids. Fig. 8.2 Approximately circular Approximately circular grains in a limestone grains in a limestone (top) and sandstone (top) and sandstone (bottom) have become (bottom) have become elliptical. elliptical.
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cture 5: cture 5: 5 Definition of Metamorphism Changes in mineral assemblage and rock texture that occur in  rocks  IN THE SOLID STATE  as a result of changes in  temperature, pressure, and effects of chemically reactive fluids. Recrystallization Recrystallization : rearrange atoms in the crystalline  : rearrange atoms in the crystalline  lattice. lattice.
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cture 5: cture 5: 6 Definition of Metamorphism Changes in mineral assemblage and rock texture that occur in  rocks  IN THE SOLID STATE  as a result of changes in  temperature, pressure, and effects of chemically reactive fluids. Recrystallization Recrystallization : rearrange atoms in the crystalline lattice (due to  : rearrange atoms in the crystalline lattice (due to  pressure, in this case). pressure, in this case).
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cture 5: cture 5: 7 Controlling factors  Heat 1. Permits  recrystallization 2. Supplied by burial  (temperature  increases with depth)  or igneous intrusions Fig. 8.23
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cture 5: 8 Graph (phase diagram) shows the range of temperatures and pressures at Graph (phase diagram) shows the range of temperatures and pressures at which the three minerals (which have the same chemical composition, which the three minerals (which have the same chemical composition, Al Al 2 SiO SiO 3 , but different crystalline structure) would form in metamorphic rocks. , but different crystalline structure) would form in metamorphic rocks.
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This note was uploaded on 09/25/2011 for the course GEOLOGY 100 taught by Professor Lepre during the Fall '11 term at Rutgers.

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05_metamorphic_09_post - 05: Metamorphic Rocks...

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