Overview

Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Boudinage is a geological term for structures formed by extension, where a rigid tabular body such as a bed of sandstone, is stretched and deformed amidst less competent surroundings. The competent bed begins to break up, forming sausage-shaped boudins. Boudins are typical features of sheared veins and shear zones where, due to stretching along the shear foliation and shortening perpendicular to this, rigid bodies break up. This causes the resulting boudin to be its characteristic sausage or barrel shape. They can also form rectangular structures Ductile deformation conditions also encourage boudinage rather than imbricate fracturing. In three dimensions, the boudinage may take the form of ribbon-like boudins or chocolate-tablet boudins, depending on the axis and isotropy of extension. They range in size from about 20 m thick to about 1 cm.

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