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Cleavage diverges away from the fold closure, upward in an anticlinal closure and downward in a synclinal closure. The correct solution is therefore given by the sketch on the left, where the cleavage diverges upward away from the core of the anticline. In contrast the sketch on the right shows that the cleavage converges downward toward the core of the synform, this is never observed in nature.
In conclusion, cleavage-bedding relationships help structural geologists 1/ to infer the position of a given outcrop in a fold system, 2/ to infer the succession of fold closure with respect to an outcrop. |
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