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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Gurmeet Singh posted an Question
November 29, 2020 • 05:00 am
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30 points
30 points
- IIT JAM
- Geology (GG)
Sir why metamorphic rock have more elongation quotient than igneous and sedimentary rocks.
TOundness. us Generally the elongation quotient is maximum in metamorphic rocks, less 9 rocks and very less in sedimentary rocks. Thus when the source rock is of metamo origin, the sphericity of the clastic grains is not that much pronounced. ) Packing It is the manner of aggregation of sedimentary grains, which are held together in
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Rahul kumar Best Answer
Metamorphic rocks commonly form under differential stress (unequal stress from different directions) condition. As a result of differential stress, the mineral grains show elongated habit (elongation perpendicular to sigma-1 direction) which in turn lead to high elongation quotient. Whereas in case of igneous rocks, the stress conditions are fairly uniform, giving rise to common equant grains.