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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Ishita Das posted an Question
December 10, 2020 • 04:23 am
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30 points
30 points
- IIT JAM
- Geology (GG)
The given p-t diagram shows four distinct metamorphic paths designated as 1,2,3,4 which one of these p-t paths represent burial metamorphism?
The given P-T diagram shows four distinct metamorphic paths designated as 1,2,3,4 Which one of these P-T paths represent burial metamorphism? Refer figure
2 Answer(s)
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Saurabh 1 Best Answer
Clearly in path 2 , one can see increase in physical conditions (pressure and temperature) or in general a characteristic of prograde Metamorphism. This path is considered to be the norm for regional metamorphism which involves intense deformation(or one can say a typical P-T-t path for an orogenic belt which experiences crustal Thickening)... So correct option is (b) Path 2...
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Just to have a clearer view, what will the other 3 paths represent respectively?
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Sorry for late reply.... Well coming to your question... Path 1 as you can see it shows that there is isothermal decompression, clearly pressure decreases at constant temperature(more of a retrograde metamorphism).. Path 3 shows different physical situations under which rock is heated and cooled at some constant pressure (isobaric condition), most probably due to magmatic intrusion , hence a possible path for a contact metamorphism.. Path 4 is a counter clockwise P-T-t path, occurring on a prominent scale in high grade gneisses and granulite facies terranes(resulted due to intrusion of mainly mafic magma in crustal part.
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thank you sir
I was busy for last ten days I will answer from today my timing is 10 pm and onwards ..if I sleep I will answer by morning... earlier I was fully giving my time now exams are heading so .....I hope you all will understand and cooperate..