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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Gurmeet Singh posted an Question
December 27, 2020 • 20:57 pm
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30 points
30 points
- IIT JAM
- Geology (GG)
. match the structural processes in group i with their products in group i. group i pressure solution 1. boudin group i ayer-paralle 2. bending fold extension r
. Match the structural processes in Group I with their products in Group I. Group I Pressure solution 1. Boudin Group I ayer-paralle 2. Bending fold extension R. Layer-perpendicular 3. Ptygmatic fold shortening S. Layer-parallel 4. Stylolite shortening P4 Q-2. R-3, S-1 B. P-3. Q-2. R-4. S-I C.P. Q-1. R-2. S-3 D. P-2, Q-1, R-3, Ss-
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Saurabh 1 Best Answer
Correct answer should be (C) ..... Stylolite is formed in the case of pressure action or one can say it is a subplanar surfaces at which mineral material has been removed by pressure dissolution. Boudins are formed by layer parallel extension or tensional forces applied parallel to the layers..... Bending folds are formed due to compressive stress acting perpendicular to the layers or due to layer perpendicular shortening(opposite of buckling which is also due to layer compression but here the forces of compression acts parallel to the layer)... Ptygmatic fold is formed in case of layer parallel shortening.Ptygamtic folds is found in migmatite which is found to be form during leucosome–melanosome differentiation.
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Owishi Sarkar![best-answer]()
The answer should be C). Stylolite is due to pressure solution. Boudins are extensional structures formed due to layer parallel extension and bending occurs due to layer perpendicular shortening. Ptygmatic folds are formed due to ductility contrast and layer parallel shortening. Refer to pictures of ptygmatic fold and bending fold.