Homework Activities Activity I: Metamorphic Grade 1. What What letter on the cha
ID: 286946 • Letter: H
Question
Homework Activities Activity I: Metamorphic Grade 1. What What letter on the chart corresponds to these 2. Rocks What letter on the chart corresponds to contact metamorphism? 3. Give the rock name that best matches the conditions for each location and the protolith. answer the following questions. You should also refer to Fig, 3&67. type of metamorphism occurs at low temperature and high pressure? undergo contact metamorphism at varying temperatures and O prese Location 1: Basalt protolith Greenstone Location 3: Limestone protolith mar bic Location 4: Shale protolith Gneiss Location 2: Shale protolith Schist 4. If the rock at location 2 continued to be buried to a depth of 25 km and a tem it become? Gneis s What geologic event might cause this change in tempe ature and pressure? plate ral- erature-550°C, what rock woul 5. If the rock at location 1 were heated to 700 C, what rock would it be? What changes, if any, would occur in the rock as a result? ·Think back to the various metamorphic rocks you have examined in lab, why do the rocks with a shale tolith have more noticeable changes with pressure and temperature than those with a quartz sandstone protolith? 7. List at least two protoliths that are poor indicators of metamorphic gradeExplanation / Answer
1. DYNAMIC METAMORPHISM occurs at low temperature high pressure. Letter B in the graph indicates this type of metamorphism.
2. Contact metamophism occurs at varying temperature and LOW pressure. The letter Y in the graph corresponds o contact metamorphism.
3. Loc 1 Basalt protolith- Greenstone
Loc 2 Shale protolith- Schist
Loc 3 Limestone protolith- Marble
Loc 4 Shale protolith- Gneiss
4. Gneiss is produced when schist is produced as a result of depth and temperature.
5. Amphibolite is produced if greenstone is heated.
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