Geol 1040 1st Edition Lecture 18Outline of Last Lecture XIV. Agents of metamorphisma. Heatb. Pressurec. FluidsXV. Heat Sourcesa. Magmab. Geothermal GradientXVI. Pressure Sourcea. Confining pressureb. Differential pressure (or stress)XVII. Fluids Sourcea. Volatilesb. Subduction zonesc. Fractures/ Fault lines Current Lecture OutlineXVIII. Metamorphic Environmentsa. Burial MetamorphismXIX. Metamorphic Gradea. Lower gradeb. Higher gradeXX. The Great Unconformitya. Unconformityb. Geologic time scaleXXI. Determining agea. Relative Datingb. Numeric DatingCurrent LectureXVIII. Metamorphic Environmentsa. Burial Metamorphismi. Associated with very thick sedimentary build upThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.ii. Required depth to start metamorphism depends on geo thermal iii. Metamorphism happens easier along faults1. Volatiles are addedXIX. Metamorphic Gradea. Lower gradei. The less pressure and lower temperatures there are the lower grade there is. It is more like its sedimentary state.b. Higher gradeii. The more pressure and temperature the farther from its sedimentary state. iii. Slate is a lower grade metamorphic rock of shale. Looks a lot like it. Gneiss is a high grade and is almost unrecognizable as shale.XX. The Great Unconformitya. Unconformityi. A break in time where geologic history is missingb. Geologic time scaleii. Most of geologic time scale is unknown, but still is represented in scale formXXI. Determining agea. Relative Datingi. Placing rocks and events in their proper sequence of formation.ii. This rock is on top of that one, therefore it is younger than the rock below it.b. Numeric Datingiii. Specifying the actual number of years that have passed since an event
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