METAMORPHIC ROCK FACIES A metamorphic facies is a group of metamorphic rocks tha
ID: 118296 • Letter: M
Question
METAMORPHIC ROCK FACIES A metamorphic facies is a group of metamorphic rocks that formed under particular temperature and pressure conditions. Part 1: Metamorphic Conditions The diagram to the right shows nine rocks that form at conditions with different pressure and temperature combinations. temperature 1. Use a diagonal arrow to show how the conditions change A BC as depth increases on the diagram 2. Circle the conditions under which Rocks B and C would form. You may circle more than one. Pressure: low medium high G H I Temperature: low mediumhigh 3. Circle the conditions under which Rocks D and G would form. You may circle more than one. Pressure: low medium high Temperature: low medium high 4. Circle the conditions under which Rocks E and I would form. You may circle more than one. Pressure: low medium high Temperature: low medium high 5. If rock is metamorphosed by being in contact with mogma, what will change more, the pressure on the rock, the temperature of the rock, or both? Explain your answe. 6. Therefore, if rock is metamorphosed by contact with mogma, which of the following letters best represents the conditions under which the rock formed, or the metamorphic facies? B and C (hornfels) Dand G (blueschist) E and I (greenschist) 7. If rock is slowly buried very deep within mountain zones, what will change, the pressure on the rock, the temperature of the rock, or both? Explain your answer.Explanation / Answer
Ans.
2.Condition B and C,
Pressure = low, Temperature = increases medium to high.
3.Condition D and G,
Pressure = medium to high, Temperature = Low.
4.Condition E and I,
Pressure = medium to high, temperature = is medium to high condition.
5.metamorphism, mineralogical and structural adjustments of solid rocks to physical and chemical conditions differing from those under which the rocks originally formed. Changes produced by surface conditions such as compaction are usually excluded. The most important agents of metamorphism include temperature, pressure, and fluids. Equally as significant are changes in chemical environment that result in two metamorphic processes: (1) mechanical dislocation where a rock is deformed, especially as a consequence of differential stress; and (2) chemical recrystallization where a mineral assemblage becomes out of equilibrium due to temperature and pressure changes and a new mineral assemblage forms.Hence both temperature and pressure play role.
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