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A stretching lineation may be visualised as a ball of treacle (molasses) which, when pulled, forms a cigar-shaped rod parallel to the direction in which it is pulled. This is parallel to the direction in which a shearing force, as found in a shear zone, stretches the rock.
The stretching lineation's mean is discovered to be orientated in 71/233, indicating that the cleavage plane served as the setting for its approximately downdip elongation. It is discovered that dextral shear domains occur concurrently with the nearby strike-parallel coaxial and non-coaxial shear domains that contain downdip stretching lineations.
S regionally pervasive stretching lineation is potentially associated with some of these faults, especially in the deeper areas of the crust which have been exhumed, because these were within the temperature and pressure conditions for brittle-ductile and ductile deformation.
For instance, the intersection lineation of a S 1 cleavage and bedding is the L 1-0 intersection lineation (also known as the cleavage-bedding lineation). Stretching lineations may be difficult to quantify, especially in highly stretched ductile rocks where minimal foliation information is preserved.
In the Central Belt the cleavage transects folds in a clockwise sense and is accompanied by a sub-horizontal stretching lineation. In the Southern belt the Tinure Fault is the surface expression of the Iapetus Suture zone. [38] The Leinster terrane is the continuation of the Lakesman terrane in the Lake District of England and the Isle of Man ...
Because of the constraints imposed by simple shear, displacement is assumed to occur in the foliation plane in a direction parallel to the mineral stretching lineation. Therefore, a plane parallel to the lineation and perpendicular to the foliation is viewed to determine the shear sense.
Here, find a morning stretch routine recommended by physical therapists, including moves like the cat-cow, figure-4 stretch, and more.
At this point shear foliations begin to break down into a rodding lineation or a stretch lineation. Such rocks are known as L-tectonites. Stretched pebble conglomerate L-tectonite illustrating a stretch lineation within a shear zone, Glengarry Basin, Australia.