As parent rock is metamorphosed high-grade metamorphic rock As parent rock is me
ID: 287320 • Letter: A
Question
As parent rock is metamorphosed high-grade metamorphic rock As parent rock is metamorphosed, High 15 20 High 15 800 1000 Temperature () Based on the diagram above, the metamorphic rock gneiss can form at a depth of about 20 km. Under standard conditions (not shown in this diagram), the temperature at 20 km depth is approximately 600 degrees Celsius. According to this diagram, what set of conditions could be possible during high-grade 1. According to the diagram above/left, what temperature range does a gneiss require at 20 km depth? 2. What is a likely source of the additional heat that creates gneiss under metamorphic 3 kbar (-10 km deepl and 300 c O 6 kbar(-20 km deepl and 500c O 7 kbar (-25 km deepl and 900c O No answer text provided. conditions? Be specific.Explanation / Answer
1. Required 700oC at 20 km depth.
2. Additional source of heat is radioactive heat.
3. For high grade metamorphism, required 7 kbar (~25 km depth) and 900o C
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