Cadomian Orogeny - Models

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

Famous quotes containing the word models:

    Grandparents can be role models about areas that may not be significant to young children directly but that can teach them about patience and courage when we are ill, or handicapped by problems of aging. Our attitudes toward retirement, marriage, recreation, even our feelings about death and dying may make much more of an impression than we realize.
    Eda Le Shan (20th century)

    The parents who wish to lead a quiet life I would say: Tell your children that they are very naughty—much naughtier than most children; point to the young people of some acquaintances as models of perfection, and impress your own children with a deep sense of their own inferiority. You carry so many more guns than they do that they cannot fight you. This is called moral influence and it will enable you to bounce them as much as you please.
    Samuel Butler (1835–1902)

    ... your problem is your role models were models.
    Jane Wagner (b. 1935)