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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Gurmeet Singh posted an Question
January 04, 2021 • 01:15 am
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30 points
30 points
- IIT JAM
- Geology (GG)
9 in the given diagram, which one of the combinations correctly lists structures typically developed at i, ii, ii, iv? strike-slip (simple shear) contraction ex
9 In the given diagram, which one of the combinations CORRECTLY lists structures typically developed at I, II, II, IV? Strike-slip (simple shear) Contraction Extension (A) I-pressure ridge, II-thrust, III-horst, IV-pull-apart basin (B) L- pull-apart basin, II-thrust, II1-horst, IV-pressure ridge (C) 1-pressure ridge, II-pull-apart basin, III-thrust, IV-horst (D) 1- pull-apart basin, II- pressure ridge, III-horst, IV-thrust
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Saurabh 1 Best Answer
Well I will keep it simple. You might be knowing about Horst, which is related to normal fault(and hence Extensional regimes purely). As IV is only about extension, so IV- Horst most probably. See you got your answer as (C)... Just by knowing IV is Horst. Also you might be knowing thrust is related to reverse fault which in turn leads to crustal shortening (in short contractional settings purely). So III - Thrust. I - Pressure ridge This is intermediate between Strike slip and Contraction. Also Pressure ridge is formed due to buckling in the ice sheets and the lateral Movement leads to the displacement which initiates buckling and contraction in the ice layers. II - Pull Apart Basin Pull Apart Basin is formed due to the strike slip and extensional settings. Pull apart form due to lateral movement because of strike slip and is succeeded by extension. So correct option will most probably be (C).