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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
- IIT JAM
- Geology (GG)
Which of the following type of fold associated with migmatite?
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Sajan sarthak Best Answer
Migmatite is a composite rock found in medium and high-grade metamorphic environments. . Migmatites often appear as tightly, incoherently folded veins (ptygmatic folds). These form segregations of leucosome, light-colored granitic components exsolved within melanosome, a dark colored amphibole- and biotite-rich setting.
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Owishi Sarkar
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Answer is C) Ptygmatic folds. These folds are chaotic, random and disconnected and are often associated with migmatites.(mixed rocks showing partial metamorphism with streaks of granite)
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Rahul kumar
Ptygmatic: Folds are chaotic, random and disconnected. Typical of sedimentary slump folding, migmatites and decollement detachment zones. Piercing fold: A fold which develops by the forcible upward movement of mud or salt diapirs. Suprataneous fold: A fold in which the beds are thinner at the crest and thicker at the trough. Typically forms when folding and sedimentation are contemporaneous. Reclined fold: Axial plane dip direction and hinge line plunge direction is same.