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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Shivam Sharma posted an Question
September 04, 2020 • 15:20 pm
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30 points
30 points
- CSIR NET
- Earth Sciences
The mineral assemblage which does not correctly define a metamorphie facies (a) albite +epidote + actinolite+ chlorite (b) hornblende + plagioclase + lmenite (c
The mineral assemblage which DOES NOT correctly define a metamorphie facies (A) Albite +Epidote + Actinolite+ Chlorite (B) Hornblende + Plagioclase + lmenite (C)Omphacite + Garnet + Plagioclase D) Orthopyroxene + Clinopyroxene + Plagioclase + Hornblende The answer is C ?
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Sajan sarthak
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ECLOGITE FACIES HAS NO PLAGIOCLASE SO OPTION C IS NOT A FACIES. it will simply omphacite and pyrope
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Rahul kumar Best Answer
Ans(C) Omphacite + Garnet + Plagioclase assemblage doesn't indicate any metamorphic facies because in eclogite facies (contains Omphacite+garnet only), plagioclase never occurs. Other assemblages indicate a particular metamorphic facies as written below. Hornblende + Plagioclase + lmenite: Amphibolite facies of mafic rocks Orthopyroxene + Clinopyroxene + Plagioclase + Hornblende: Granulite facies of mafic rocks Albite + Epidote + Actinolite + Chlorite: Greenschist facies of mafic rocks