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"S. Mitra" wrote: > On Tue, 7 Nov 2000, Wojciech Czaplinski wrote: > > > Hello, > > Before I say farewell and unsubscribe from this group, there is one > > question I want to ask: > > It is commonly believed, that stretching lineation in the shear zones > > marks the direction of tectonic transport. So why the hell is it usually > > parallel to the folds' axes? Seems in contrary to me... > > hello, > well this ia a thing which is related to subsequent stages of shearing > when the cylindrical folds with fold axes perpendicular to the transport > direction gets dragged down forming seath folds, with a hair pin bend > developed on the fold axis. this might seemingly look as if the fold axes > were parallel to the stretching lineation Well, I've never seen any of those cylindrical folds from the _early_ stages of shearing... Besides, the folds with axes parallel to the lineation are mostly consistently asymmetric... greetings - Wojtek %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%