Models
There are two overall models for the formation of the Cadomian Orogeny.
Firstly by Jean-Pierre Brun & P. Bale that compression to the south west of a volcanic arc and back arc basin onto the edge of the continent at the St Malo and Mancellian regions 590 million years ago formed the orogeny. Crustal thickening took place afterwards.
Secondly P. J. Treloar considers that the North Armorican Massif was put together from a series of terranes 540 million years ago, their joins are the shear zones. The terranes are known as St Brieuc, St Malo and Mancellian terranes. Deformation in this model is caused by oblique subduction and is strike-slip, but not crustal thickening. The migmatite belts would then be explained by high heat flow in marginal basins.
Read more about this topic: Cadomian Orogeny
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