Decoupled flexure in the South Pyrenean Foreland

Waltham, Dave; Docherty, C.; Taberner, C.

doi:10.1029/2000jb900064

Cited by 10 publications

(12 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…those that focus on finer aspects over smaller areas) do (Beaumont et al . 2000; Waltham et al . 2000), and we obtain higher rigidity values.…”

Section: Discussionmentioning

confidence: 99%

“…Moreover, our results reveal a certain degree of coupling between surface processes (erosional patterns) and tectonic processes (differential uplift induced by the stretching phase in the Valencia Trough). Again local deviations of the erosional pattern close to the Catalan Coastal Ranges can be attributed to low‐wavelength upper crustal flexural effects (Zeyen & Fernàndez 1994; Waltham et al . 2000), such as normal faulting and Plio‐Pleistocene volcanism.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Three-dimensional flexural modelling of the Ebro Basinï¿½(NE Iberia)

Gaspar‐Escribano¹,

Wees²,

Voorde³

et al. 2001

Geophysical Journal International

View full text Add to dashboard Cite

SUMMAR YThe Ebro Basin, the southern foreland basin of the Pyrenees, has undergone a complex evolution in which, apart from the Pyrenees, the Iberian Range and the Catalan Coastal Ranges have played an important role, both as sediment sources and as basin confining structures. The deflected basement underlying the Ebro Basin dips north, suggesting a lithospheric-scale control on the structure of this basin. This is compatible with the results of subsidence analyses, which show that the study area is not in a local mode of isostatic compensation.In order better to understand the mechanisms that led to the present configuration of the Ebro Basin, and particularly the relevance of the various kinds of (un)loading (e.g. surrounding fold-and-thrust belts, basin topography, subsurface loads), we carried out a 3-D kinematic modelling study that accounts for the flexural state of the lithosphere, subjected to various loads applied at its lateral boundaries, and the sedimentary fill of the basin. We also included the effect of Neogene extensional tectonics along the eastern basin margin, which is related to the opening of the Valencia Trough.We show the suitability of the 3-D lithospheric-scale flexural modelling approach to the study of NE Iberia. Modelling results point to a relatively strong lithosphere in this area, with values of effective elastic thickness ranging from 10 to 35 km in the Ebro Basin, increasing towards the Pyrenees. We also find that the topographic (tectonic) load itself is insufficient to explain the observed basement deflection. Thus an extra subsurface load beneath the Pyrenees, corresponding to the underthrusted Iberian lithosphere, is required. The effect of lithospheric stretching in the Valencia Trough on the Ebro Basin is appreciable only in its eastern part, where the lithosphere was uplifted. This had considerable repercussions on the sedimentary and erosional regime of the Ebro Basin. We have analysed the link between the stretching-related, tectonically uplifted areas and the erosional patterns observed onshore northeast Iberia.

show abstract

“…those that focus on finer aspects over smaller areas) do (Beaumont et al . 2000; Waltham et al . 2000), and we obtain higher rigidity values.…”

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Three-dimensional flexural modelling of the Ebro Basinï¿½(NE Iberia)

Gaspar‐Escribano¹,

Wees²,

Voorde³

et al. 2001

Geophysical Journal International

View full text Add to dashboard Cite

show abstract

“…As pointed out recently by several authors [ Vegas et al , 1990; Van Wees et al , 1996; Andeweg , 2002], large‐scale intraplate deformation of Iberia has also occurred from Early Tertiary onward. In the eastern part of the Iberian Peninsula the structural grain of the mechanical coupling with the Pyrenean orogeny is still recognizable with indication for small‐scale lithosphere folding [ Verges et al , 1998; Waltham et al , 2000].…”

Section: Introductionmentioning

confidence: 99%

Lithospheric folding in Iberia

Burov²,

et al. 2002

View full text Add to dashboard Cite

[1] Integration of stress indicator data, gravity data, crustal kinematics data, and analysis of topography and recent vertical motions demonstrates the occurrence of consistently oriented spatial patterns of large-scale Alpine to recent intraplate deformation in Iberia. The inferred upper crustal and lithospheric deformation patterns and the timing of the associated expressions at or near the surface support the existence of a close coupling with plate boundary processes operating at the margins of Iberia. Patterns of lithosphere and upper crustal folds are oriented perpendicular to the main axis of present-day intraplate compression in Iberia inferred from structural analysis of stress indicator data and focal mechanism solutions. These findings suggest the presence of lithospheric folds, with wavelengths compatible with theoretical predictions of folding wavelengths of Variscan lithosphere. Stress-induced intraplate deformation set up by plate interactions is compatible with indications for the absence of present-day deep mantle-lithosphere interactions inferred from seismic tomography.

show abstract

“…More recently, ter Voorde et al [24] and Waltham et al [25] have proposed a partially decoupled mode of lithospheric deformation, which could be considered as a combination of horizontal and vertical decoupling. At ¢rst order approximation, the lithosphere is isostatically coupled.…”

Section: Implications Of a Crustal Decoupling Level On The Tectonic Ementioning

confidence: 99%

Mechanical (de-)coupling of the lithosphere in the Valencia Trough (NW Mediterranean): what does it mean?

Gaspar‐Escribano

Voorde

Roca

et al. 2003

Earth and Planetary Science Letters

View full text Add to dashboard Cite

We study the mechanics of lithospheric decoupling in continental extensional basins in relation to the distribution of (non-)competent mechanical layers within the lithosphere and the position of the isostatic compensation level. We specifically address the different modes of deformation taking place in crustal levels according to a self-consistent formulation of the concept of mechanical decoupling. Subsequently, we investigate the style of lithospheric decoupling in the Valencia Trough (NW Mediterranean), a prime example of a young continental rift basin. During its evolution, the lower crust (or at least part of it) acted as a weak, non-competent layer that eventually flowed laterally to accommodate deformation in the subcrustal lithosphere and overlying crust, which became mechanically decoupled. We use a numerical model to discern whether these two layers deformed fully independently (vertical decoupling), or maintaining a mechanical link (horizontal and partial decoupling). Results of our study, constrained by a high-quality database, exclude fully decoupled mode and favor isostatic compensation level in the asthenosphere. Interpretation of our results in light of geological and geophysical data suggests that the present Valencia Trough is best described by partial lithospheric decoupling. ß

show abstract

Decoupled flexure in the South Pyrenean Foreland

Cited by 10 publications

References 27 publications

Three-dimensional flexural modelling of the Ebro Basinï¿½(NE Iberia)

Three-dimensional flexural modelling of the Ebro Basinï¿½(NE Iberia)

Lithospheric folding in Iberia

Mechanical (de-)coupling of the lithosphere in the Valencia Trough (NW Mediterranean): what does it mean?

Contact Info

Product

Resources

About