FAULTS, DUCTILE DEFORMATION ASSOCIATED WITH
FAULTS, TERMINATIONS OF
Faults are usually associated with ductile component of deformation. Faults usually terminate on either side by gradual decrease in the amount of displacement and eventually merge in a wider zone in which there is no clear cut discontinuity but the strain is ductile and spreads over a large area. This area incrases or widens but the amount of strain per unit area goes on diminishing. In the top figure, gradual decrease in amount of displacement is shown from left to right. Below is a photograph of a minor vertical dextral strike slip fault in silcified dolomite in which silica veins displacement diminishes from left to right progressively. Further to the right, silica veins are only dragged but not broken and extreme right, the vens continue without drag or displacement but are slightly thinned close to the fault which is ot clearly recognisable.