Computer Science
Scientific paper
Feb 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986e%26psl..77...70p&link_type=abstract
Earth and Planetary Science Letters, Volume 77, Issue 1, p. 70-80.
Computer Science
18
Scientific paper
The ancient flow regime in natural shear zones is often considered to have followed a deformation path comparable to that in theoretical shear zones, i.e. progressive simple shear between rigid wall rocks with a persistent flow plane orientation parallel to the edges of the zone. This is often based on the presence of monoclinic fabric elements in the zones which indicate a dominantly non-coaxial flow regime, though not necessarily persistent simple shear. The deformation fabric of a shear zone from the Pyrenees illustrates that, even at a kinematic vorticity number of W' = 1 (simple shear) along the entire deformation path, obliqueness of the flow planes with the edges of the zone is possible for some time if incremental stretching axes were rotating with respect to zone edges. This implies that ductile deformation must have taken place in the wall rock of the zone. Such a flow regime may be difficult to recognize with the fabric criteria used at present but leads to an unusual kinematic significance of the shear zone involved; in extreme cases the zone may have acted as a passive marker in a ductilely deforming medium. It also means that not only W' must be known to reconstruct the ancient flow regime in natural shear zones, but at least also the time dependence of the orientation of the incremental stretching axes.
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