To add to my previous comments, 'passive' and 'flexural'
folding were initially defined as kinematic models of folding in
which the geometry of the deformation was prescribed: inhomogeneous
simple shear for the former; and bending either by what we termed
'orthogonal flexure' or by flexural shear (with layer-parallel
shearing) for the latter. Subsequent ideas tried to relate
qualitatively the resulting geometries to rheology, as I noted
before.
But kinematic models cannot accurately describe the evolution
of real systems, as numerical modeling has made abundantly clear.
Thus the kinematic models are of limited use, except perhaps as
initial introductions to the fascinating realm of fold development.
Rob Twiss
>Dear All,
>
>Bit disappointed not to have generated more replies to this topic. I have
>seen the term 'passive folding' used for shear modification of an existing
>fold without generating a cleavage. As this is contrary to what I
>understand the term to mean, is there a structural concensus as to the
>term'passive folding'?
>
>Would welcome thoughts on my earlier email also.
>
>Thanks,
>Joanie Marion
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Robert J. Twiss email: [log in to unmask]
Geology Department telephone: (530) 752-1860
University of California at Davis FAX: (530) 752-0951
One Shields Ave.
Davis, CA 95616-8605, USA
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