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- W2068609323 abstract "Hercynian deformation in Central Brittany is responsible for folding of Paleozoic and earlier sediments, with concurrent development of cleavage (essentially E-W and vertical) and stretching lineation (essentially horizontal). In the past, the regional motion was inferred to be a N-S shortening; more recent studies emphasize E-W transcurrent motions associated with major crustal faults. Values and orientations of ductile strain at 29 localities in Central Brittany show that the regional deformation is basically a horizontal plane strain, with local three-dimensional perturbations. We first remove the perturbations, rendering the problem two-dimensional. Then a selected domain is divided into an array of finite elements parallel to strain trajectories. Using strain values extant at element centroids, each element is unstrained independently of its neighbours. Resulting gaps and overlaps are minimized using a least-squares technique which allows elements to translate and rotate rigidly. Thus we obtain the configuration of the domain in the undeformed state. To within an unknown but constant rigid rotation, the domain has undergone a heterogeneous dextral simple shear, with vertical shearing plane striking N125° and horizontal shear direction. A band of low strain, running through Guer, is flanked by two zones of more intense strain. The banding is approximately parallel to a major transcurrent fault in the area, the South Armorican Shear Zone." @default.
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- W2068609323 date "1982-02-01" @default.
- W2068609323 modified "2023-10-14" @default.
- W2068609323 title "Mathematical removal of regional ductile strains in Central Brittany: Evidence for wrench tectonics" @default.
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- W2068609323 doi "https://doi.org/10.1016/0040-1951(82)90052-x" @default.
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