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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Gurmeet Singh posted an Question
January 30, 2021 • 01:24 am
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30 points
30 points
- IIT JAM
- Geology (GG)
The assemblage staurolite+ garnet +biotite + muscovite +quartz in pelites is stable in (a) greenschist facies (c) granulite facies (b) amphibolite facies (d) py
The assemblage staurolite+ garnet +biotite + muscovite +quartz in pelites is stable in (A) greenschist facies (C) granulite facies (B) amphibolite facies (D) pyroxene hornfels facies
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Saurabh 1
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This pelitic assemblage is characteristic of Amphibolite facies mainly. It cannot be granulite , as you might be knowing already that in granulite facies dehydrated mineral assemblage prevailed and there you can see the dehydration of muscovite to form K feldspar and Aluminosilicate.
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Sajan sarthak Best Answer
IT'S NOT GRANULITE AS GRANULITE DOESN'T CONTAIN HYDROUS MINERAL LIKE MUSCOVITE. NOT HORNFELS OF PYROXENE AS PYROXENE NOT PRESENT. NOT EVEN GREENSCHIST AS NO CHROLITE ,EPIDOTE LIKE GREEN MINERAL PRESENT SO IT'S DEFINITELY A AMPHIBOLITE AND STUROLITE IS A MINERAL IN BARROVIAN ZONE WHICH FALLS IN AMPHIBOLITE FACIES.
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sir can you make it more easy only for the pelites.. please..
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Asif ali![best-answer]()
Muscovite mainly stable as maximum upto the the upper zone of the AMPHIBOLITE FACIES nearly about 600°C temperature and further increase of temperature cause a MUSCOVITE BREAKDOWN REACTION === Muscovite+ Qaurtz = K-Feldspar+ Sillimanite+ some monzo granitic fluids. That means above 600° C Temperature Muscovite mainly breakdown to orthoclase and Sillimanite. So Amphibolite is the correct option and I am attaching some minerals stability diagram in pelitic rock but this diagram is more complex for you all please try to understand this diagram and get some mineral stability along with P-T conditions and different facies.