Lab 04_Metamorphic Rocks

Lab 04_Metamorphic Rocks - Lab 4 Metamorphic Rocks I...

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Lab 4 Metamorphic Rocks I. Definition “Metamorphic” = of changed form Metamorphic rocks are rocks that have been altered (changed) physically and/or chemically by intense pressure, temperature and/or chemical action of hot fluids (flowing substances, including both liquids and gases). The pre-existing rocks that get metamorphosed can be igneous, sedimentary, or even metamorphic rocks. Every metamorphic rock has a parent rock or protolith. II. Causes of Metamorphism Heat - temperatures range from about 200 degrees C to the melting temperature of rocks Geothermal gradient - temperature increases with depth in the Earth on average 25 degrees C per kilometer Pressure o Confining pressure - due to the weight of overlying rock. Doesn't result in a change of shape or in a foliated texture o Directed pressure/Differential stresses - pressure that is greater in one direction than another. Produces a change in shape and causes a foliation (layering and parallel alignment of flat minerals) Fluids - hot water acts as catalyst for metamorphic reactions III. Types of Metamorphism Contact metamorphism : occurs locally, adjacent to igneous intrusions, and along fractures that are in contact with hot
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Lab 04_Metamorphic Rocks - Lab 4 Metamorphic Rocks I...

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