Deformation bands, early markers of tectonic activity in front of a fold-and-thrust belt: Example from the Tremp-Graus basin, southern Pyrenees, Spain

Robert, Romain; Robion, Philippe; Souloumiac, Pauline; David, Christian; Saillet, Élodie

doi:10.1016/j.jsg.2018.02.012

Cited by 27 publications

(21 citation statements)

References 91 publications

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“…In the following, we will take a value of Q/P = 0.7 (Figure 1), which is consistent with the average observation provided by geomechanical experiments conducted on different sandstones [14,[17][18][19][20][21][22][23]. [24]; Burial in dark blue and extensive regime in light blue, followed by the compressive regime in red). The stress path crosscut the envelopes, leading to the deformation bands' set up.…”

Section: Introductionsupporting

confidence: 67%

“…This article aims to verify the hypothesis proposed by Robert et al [24] of a shallow occurrence of these bands, involving both the material properties in each facies and the fold and thrust kinematics, based on geological evidence and confirmed by a magnetic fabric study.…”

Section: Introductionmentioning

confidence: 59%

“…Recently, Robert et al [24] analyzed cataclastic bands in the calcarenite facies of the Aren formation, formed under a compressive regime and in front of a thrust in the Tremp basin situated in the southern central Pyrenees. The Meso-Cenozoic Tremp basin was formed during the late Cretaceous and Cenozoic.…”

Section: Introductionmentioning

confidence: 99%

“…The basin is limited at its northern border by the Sant-Corneli-Boixols fold and thrust belt, which developed during the Pyrenean orogeny [31][32][33][34][35]. The Sant-Corneli-Boixols is a fault-propagation fold that emerged above a detachment located within the Triassic evaporites, [24]; Burial in dark blue and extensive regime in light blue, followed by the compressive regime in red). The stress path crosscut the envelopes, leading to the deformation bands' set up.…”

Section: Introductionmentioning

confidence: 99%

“…The Sant-Corneli-Boixols is a fault-propagation fold that emerged above a detachment located within the Triassic evaporites, resulting from an inversion of lower Cretaceous basins [32,34,[36][37][38]. In front of the fold, syn-tectonic growth-strata developed from the late upper Cretaceous (Campanian) to Paleocene [39,40], in which the deformation bands in the Aren formation (Maastrichtian) have been analyzed [24].…”

Section: Introductionmentioning

confidence: 99%

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Numerical Simulation of Deformation Band Occurrence and the Associated Stress Field during the Growth of a Fault-Propagation Fold

Robert¹,

Souloumiac²,

Robion³

et al. 2019

Geosciences

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Knowledge of the paleo-stress distribution is crucial to understand the fracture set up and orientations during the tectonic evolution of a basin, and thus the corresponding fluid flow patterns in a reservoir. This study aims to predict the main stress orientations and evolution during the growth of a fold by using the limit analysis method. Fourteen different steps have been integrated as 2D cross sections from an early stage to an evolved stage of a schematic and balanced propagation fold. The stress evolution was followed during the time and burial of syn tectonic layers localized in front of the thrust. Numerical simulations were used to predict the occurrence and orientation of deformation bands, i.e., compaction and shear bands, by following the kinematic of a fault-propagation fold. The case study of the Sant-Corneli-Boixols anticline was selected, located in the South Central Pyrenees in the Tremp basin, to constrain the dimension of the starting models (or prototypes) used in our numerical simulations. The predictions of the numerical simulations were compared to field observations of an early occurrence of both pure compaction- and shear-enhanced compaction bands in the syn-tectonic Aren formation located in front of the fold, which are subjected to early layer parallel shortening during the burial history. Stress magnitude and stress ratio variations define the type of deformation band produced. Our results show that the band occurrence depends on the yield envelope of the host material and that a small yield envelope is required for these shallow depths, which can only be explained by the heterogeneity of the host rock facies. In our case, the heterogeneity can be explained by a significant contribution of carbonate bioclasts in the calcarenite rock, which change the mechanical behavior of the whole rock.

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