Lecture 9 Notes

Lecture 9 Notes - In the Jurassic, there were wetlands and...

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Unformatted text preview: In the Jurassic, there were wetlands and many lakes in this area, providing a great place for dinosaurs to thrive. Much later, the rocky mountains formed, lifting the Jurassic rocks to the surface. Metamorphic Rocks Read sections: 8.7-8.9 Review Metamorphic Rocks Metamorphic rocks are rocks that have undergone changes in: a) minerals b) texture c) chemical composition Due to increased: a) pressure b) temperature c) chemical reactions in fluids Review Pre-existing rocks (either sedimentary, igneous, or metamorphic) may be placed into new environments with different temperature, pressure, and/or chemical fluids. Once these rocks are placed into these new temperature, pressure, and/or chemical environments, they metamorphose (change) in order to equilibrate with their new surroundings. Review Changes in mineralogy: Some old minerals may be destroyed, and new minerals may be formed. Changes in texture: Minerals may recrystallize, meaning that they may change their shape and size. Changes in chemical composition: As old minerals are destroyed, they may release water with dissolved compounds and ions. New minerals may be formed by dissolved compound and ions in water. Temperature There are 2 ways in which a rock experiences higher temperature: a)Nearby molten rock (magma or lava) can increase the temperature. b) Rocks can be buried or tectonically pushed to deeper regions where temperature is higher. Geothermal Gradient: The increase of temperature with depth On average, temperature increases 30 o C for every kilometer depth! (roughly 90 o F per mile)....
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Lecture 9 Notes - In the Jurassic, there were wetlands and...

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