| Collisional Mountain Belts |
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| Collisional mountain belts involve the staking of several crustal segments. In the upper part of the crust, sedimentary layers can be transported over a few hundred kilometers on top of the basement. This is made easier when a weak layer such as salt exists at the base of the sedimentary pile. The fold and thrust belt affecting a paleozoic sedimentary sequence (orange/yellow) in the foreland of the Canadian cordillera is a good example. In the Foot Hills the Paleozoic rocks are thrusted on top of mesozoic sediments (blue and green). Palaeozoic and mesozoic sedimentary nappes are translated on top of the Proterozic crystalline (gneisses and granites, in pink) basement. |
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