BOUDIN NECKS
The extensional gaps between the individual boudins may be rather long
is some cases owing to brittle ductile deformation and these are the ones
where the layers are actually thinned like necks and hence the term. The
protracted stretching period may be in pulses that give rise to infill of
these necks by calcite or quartz filling in the gaps as fibrous
crystalline growth. Thus boudin necks are formed between lenses of
competent material formed by elongation of interlayered
competent/incompetent layers.
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