Publication: Oblique strain partitioning and transpression on an inverted rift: The Castilian Branch of the Iberian Chain
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Publication Date
2009
Authors
Vicente Muñoz, Gerardo de
Vegas, Ramón
Wees, Jan Dierik van
Casas Sáinz, Antonio
Sopeña, Alfonso
Sánchez-Moya, Yolanda
Arche, Alfredo
López Gómez, José
Olaiz Campos, Antonio José
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Publisher
Elsevier
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Abstract
The Iberian Chain is a wide intraplate deformation zone formed by the tectonic inversion during the
Pyrenean orogeny of a Permian –Mesozoic basin developed in the eastern part of the Iberian Massif. The N – S
convergence between Iberia and Eurasia from the Late Cretaceous to the Lower Miocene times produced
signi cant intraplate deformation. The NW –SE oriented Castilian Branch of the Iberian Chain can be
considered as a “key zone ” where the proposed models for the Cenozoic tectonic evolution of the Iberian
Chain can be tested. Structural style of basin inversion suggests mainly strike slip d–isplacements along
previous NW –SE normal faults, developed mostly during the Mesozoic. To con rm this hypothesis, structural
and basin evolution analysis, macrostructural Bouguer gravity anomaly analysis, detailed mapping and
paleostress inversions have been used to prove the important role of strike slip deformation. In addition, we
demonstrate that two main folding trends almost perpendicular (NE SW t–o E W an–d NW SE) w–ere
simultaneously active in a wide transpressive zone. The two fold trends were generated by dierent
mechanical behaviour, including buckling and bending under constrictive strain conditions. We propose that
strain partitioning occurred with oblique compression and transpression during the Cenozoic.