METAMORPHIC ROCKS

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North Carolina State University *

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101

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Geology

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Jan 9, 2024

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docx

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3

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PRE-LAB QUESTIONS 1. Where might you find regional metamorphic rocks being formed today? Select all that apply. a. In the core of the Himalayas b. Adjacent to a lava flow c. Near a deep, large igneous intrusion d. In a shallow fault zone e. None of the above 2. Match the following foliated rocks with their metamorphic grade: Schist = 2. Second-highest grade B. Slate = 4. Lowest Grade C. Gneiss = 1. Highest Grade D. Phyllite = 3. Second-lowest grade 3. The parent material of a metamorphic rock is known as the PROTOLITH 4. True or False? Regional metamorphism is a localized event . FALSE 5. What are the three types of metamorphism? Regional, Contact, and Dynamic ©2016, eScience Labs Metamorphic Rocks Metamorphic Rocks Metamorphic Rocks
EXERCISE 1 DATA SHEET Table 5. Metamorphic Rock Identification Rock Sample Foliated (Yes/No) Grain Size Other Textural Features Composition Rock Name Protolith M Yes Medium Appears smooth Hard Amphibole Biotite Calcite Chlorite Garnet Kyanite Muscovite Quartz Sillimanite Tourmaline Schist Shale Mudstone Or Siltstone N No Hard - Coarse Gritty Scaled Calcite Dolomite Marble Limestone Or Dolostone O No Fine Smooth Is bumpy Plagioclase Feldspar Andalusite Biotite Feldspar Hornfels Any Type P Yes Medium Rough Dark colors Amphibole Biotite Kyanite Muscovite Sillimanite Gneiss Shale Mudstone Siltstone Granite Q No Fine Grit Hardened Quartz Quartzite Quartz Sandstone R Yes Fine Metallic Luster Hard shell Graphite Tourmaline Anthracite Bituminous Coal ©2016, eScience Labs Metamorphic Rocks Metamorphic Rocks Metamorphic Rocks
POST-LAB QUESTIONS 1. How did you determine the compositions of sample N and sample Q? Both N and Q are non-foliated rocks. I determined the composition by looking closely through the magnifying glass. I was able to see the size and shape to identify the rock. 2. Where might you find a rock like sample M being formed on Earth today? Many schist rocks can be found in eroded mountains or glacial deposition. 3. Sample R is highly desired in the energy industry because it is the most “clean” variety. Using your knowledge of metamorphic processes, how do you think this rock becomes so “clean” compared to its protolith? Bituminous coal is not as environmentally friendly as Anthracite coal. Anthracite coal produces no smoke or particulate emissions and is not a fire hazard when used in more circulated airways. It is cleaner than protolith as it adds extra heat and pressure to alter its overall properties making it less harmful. ©2016, eScience Labs Metamorphic Rocks Metamorphic Rocks Metamorphic Rocks
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