Oblique collision and deformation partitioning in the SW Iberian Variscides
Different transpressional scenarios have been proposed to relate kinematics and complex deformation patterns. We apply the most suitable of them to the Variscan orogeny in SW Iberia, which is characterized by a number of successive left-lateral transpressional structures developed in the Devonian to...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2016-05-01
|
| Series: | Solid Earth |
| Online Access: | http://www.solid-earth.net/7/857/2016/se-7-857-2016.pdf |
| _version_ | 1818129390308950016 |
|---|---|
| author | I. Pérez-Cáceres J. F. Simancas D. Martínez Poyatos A. Azor F. González Lodeiro |
| author_facet | I. Pérez-Cáceres J. F. Simancas D. Martínez Poyatos A. Azor F. González Lodeiro |
| author_sort | I. Pérez-Cáceres |
| collection | DOAJ |
| description | Different transpressional scenarios have been proposed to relate kinematics and complex
deformation patterns. We apply the most suitable of them to the Variscan
orogeny in SW Iberia, which is characterized by a number of successive left-lateral transpressional
structures developed in the Devonian to Carboniferous period. These
structures resulted from the oblique convergence between three continental
terranes (Central Iberian Zone, Ossa-Morena Zone and South Portuguese Zone),
whose amalgamation gave way to both intense shearing at the suture-like
contacts and transpressional deformation of the continental pieces
in-between, thus showing strain partitioning in space and time. We have
quantified the kinematics of the collisional convergence by using the
available data on folding, shearing and faulting patterns, as well as
tectonic fabrics and finite strain measurements. Given the uncertainties
regarding the data and the boundary conditions modeled, our results must be
considered as a semi-quantitative approximation to the issue, though very
significant from a regional point of view. The total collisional convergence
surpasses 1000 km, most of them corresponding to left-lateral displacement
parallel to terrane boundaries. The average vector of convergence is oriented
E–W (present-day coordinates), thus reasserting the left-lateral oblique
collision in SW Iberia, in contrast with the dextral component that prevailed
elsewhere in the Variscan orogen. This particular kinematics of SW Iberia is understood in the
context of an Avalonian plate salient currently represented by the South
Portuguese Zone. |
| first_indexed | 2024-12-11T07:48:23Z |
| format | Article |
| id | doaj.art-92b82ef6728e4e1cba4183870315fc61 |
| institution | Directory Open Access Journal |
| issn | 1869-9510 1869-9529 |
| language | English |
| last_indexed | 2024-12-11T07:48:23Z |
| publishDate | 2016-05-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Solid Earth |
| spelling | doaj.art-92b82ef6728e4e1cba4183870315fc612022-12-22T01:15:25ZengCopernicus PublicationsSolid Earth1869-95101869-95292016-05-017385787210.5194/se-7-857-2016Oblique collision and deformation partitioning in the SW Iberian VariscidesI. Pérez-Cáceres0J. F. Simancas1D. Martínez Poyatos2A. Azor3F. González Lodeiro4Departamento de Geodinámica, Facultad de Ciencias, Universidad de Granada, Campus de Fuentenueva s/n, 18071 Granada, SpainDepartamento de Geodinámica, Facultad de Ciencias, Universidad de Granada, Campus de Fuentenueva s/n, 18071 Granada, SpainDepartamento de Geodinámica, Facultad de Ciencias, Universidad de Granada, Campus de Fuentenueva s/n, 18071 Granada, SpainDepartamento de Geodinámica, Facultad de Ciencias, Universidad de Granada, Campus de Fuentenueva s/n, 18071 Granada, SpainDepartamento de Geodinámica, Facultad de Ciencias, Universidad de Granada, Campus de Fuentenueva s/n, 18071 Granada, SpainDifferent transpressional scenarios have been proposed to relate kinematics and complex deformation patterns. We apply the most suitable of them to the Variscan orogeny in SW Iberia, which is characterized by a number of successive left-lateral transpressional structures developed in the Devonian to Carboniferous period. These structures resulted from the oblique convergence between three continental terranes (Central Iberian Zone, Ossa-Morena Zone and South Portuguese Zone), whose amalgamation gave way to both intense shearing at the suture-like contacts and transpressional deformation of the continental pieces in-between, thus showing strain partitioning in space and time. We have quantified the kinematics of the collisional convergence by using the available data on folding, shearing and faulting patterns, as well as tectonic fabrics and finite strain measurements. Given the uncertainties regarding the data and the boundary conditions modeled, our results must be considered as a semi-quantitative approximation to the issue, though very significant from a regional point of view. The total collisional convergence surpasses 1000 km, most of them corresponding to left-lateral displacement parallel to terrane boundaries. The average vector of convergence is oriented E–W (present-day coordinates), thus reasserting the left-lateral oblique collision in SW Iberia, in contrast with the dextral component that prevailed elsewhere in the Variscan orogen. This particular kinematics of SW Iberia is understood in the context of an Avalonian plate salient currently represented by the South Portuguese Zone.http://www.solid-earth.net/7/857/2016/se-7-857-2016.pdf |
| spellingShingle | I. Pérez-Cáceres J. F. Simancas D. Martínez Poyatos A. Azor F. González Lodeiro Oblique collision and deformation partitioning in the SW Iberian Variscides Solid Earth |
| title | Oblique collision and deformation partitioning in the SW Iberian Variscides |
| title_full | Oblique collision and deformation partitioning in the SW Iberian Variscides |
| title_fullStr | Oblique collision and deformation partitioning in the SW Iberian Variscides |
| title_full_unstemmed | Oblique collision and deformation partitioning in the SW Iberian Variscides |
| title_short | Oblique collision and deformation partitioning in the SW Iberian Variscides |
| title_sort | oblique collision and deformation partitioning in the sw iberian variscides |
| url | http://www.solid-earth.net/7/857/2016/se-7-857-2016.pdf |
| work_keys_str_mv | AT iperezcaceres obliquecollisionanddeformationpartitioningintheswiberianvariscides AT jfsimancas obliquecollisionanddeformationpartitioningintheswiberianvariscides AT dmartinezpoyatos obliquecollisionanddeformationpartitioningintheswiberianvariscides AT aazor obliquecollisionanddeformationpartitioningintheswiberianvariscides AT fgonzalezlodeiro obliquecollisionanddeformationpartitioningintheswiberianvariscides |