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Title: Transpressionally driven rotation in the external orogenic zones of the Western Carpathians and the SW British Variscides
Contributor(s): Gayer, Rod (author); Hathaway, Tanya  (author); Nemcok, Michal (author)
Publication Date: 1998
DOI: 10.1144/gsl.sp.1998.135.01.16
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Abstract: Analysis of two examples of obliquely convergent external orogenic zones, the western part of the Western Carpathians and the northern Variscan margin in southwest Britain, indicates the operation of two dominant stress rotation mechanisms in the transpressionally deformed thrust wedge: (1) the rotation of an inferred stress field; (2) the rotation of a deforming body within a constant stress field. In the thinnest, external parts of the thrust wedge, σ1 stress trajectory rotations of up to 90° occur with deformation having a relatively small component of pure shear. Towards the hinterland, σ1 stress trajectories in thicker parts of the wedge are progressively less rotated but develop a larger component of pure shear. Resultant σ1 trajectories are curvilinear, lying parallel to the orogenic convergence vector in the hinterland but diverging progressively from this direction towards the foreland, where they lie at high angles to the external margin in frontal parts of the thrust wedge. It is argued that balanced cross-sections should be constructed parallel to the curved trace of the σ1 stress trajectories.
Publication Type: Book Chapter
Source of Publication: Continental Transpressional and TranstensionaI Tectonics, p. 253-266
Publisher: Geological Society of London
Place of Publication: London, United Kingdom
ISBN: 9780585254418
Field of Research (FOR): 040312 Structural Geology
Socio-Economic Outcome Codes: 970104 Expanding Knowledge in the Earth Sciences
HERDC Category Description: B1 Chapter in a Scholarly Book
Series Name: Geological Society Special Publications
Series Number : 135
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