Cenozoic Tectonic Deformation Along the Pontarlier Strike‐Slip Fault Zone (Swiss and French Jura Fold‐and‐Thrust Belt): Insights From Paleostress and Geomorphic Analyses

Radaideh, Omar Mohammad Ahmad; Mosar, Jon

doi:10.1029/2021tc006758

Cited by 7 publications

(5 citation statements)

References 197 publications

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“…Ideally, slip increments on sampled slickenfibres can be directly or indirectly related to a regional deformation zone. Such relationships were successfully established in the study area and other parts of the Jura Mountains during previous paleostrain reconstructions from fault‐slip pairs (Homberg et al., 1999; Madritsch et al., 2008; Radaideh & Mosar, 2021). The case‐study presented here could build up on the results of a similar investigation dedicated to the detailed kinematic analysis of fracture systems observed in outcrops and interpretation of their regional tectonic context (Madritsch, 2015).…”

Section: Methodsmentioning

confidence: 59%

“…The N-S striking lower Aare Valley (Figure 3), cuts orthogonally through the thrusts of the Jura FTB and has long been thought to mark the location of a tear fault, as similarly reported for the more westerly parts of the range (Laubscher, 1961;Radaideh & Mosar, 2021;Schori, 2022). To some extent, this hypothesis was inspired by the apparently abrupt termination of the Mandach Thrust west of the valley (Bitterli-Brunner, 1987).…”

Section: Regional Deformation Style and Influence Of Basement Structuresmentioning

confidence: 79%

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Reconstructing the Evolution of Foreland Fold‐And‐Thrust Belts Using U‐Pb Calcite Dating: An Integrated Case‐Study From the Easternmost Jura Mountains (Switzerland)

Madritsch,

Looser,

Schneeberger

et al. 2024

Tectonics

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This case‐study from the Jura Mountains in the foreland of the European Alps demonstrates how the coupling of subsurface analysis and U‐Pb carbonate dating can provide absolute timing constraints and shortening rate estimates of fold‐and‐thrust belts. It is confirmed that the initial Late Cenozoic foreland deformation driving the formation of the easternmost Jura Mountains in Switzerland was predominately thin‐skinned with contractional deformation largely restricted to the Mesozoic succession above a sub‐horizontal basal décollement. Thereby, the localization and structural style of related deformation structures was strongly guided by the characteristics of underlying Late Paleozoic half grabens. The main thin‐skinned thrust front formed at ∼12 Ma, followed by further deformation in the hinterland and locally continued foreland‐directed thrust propagation. The major deformation zones exposed at surface were established at ∼8 Ma but shortening continued until at least ∼4 Ma. Thick‐skinned contraction associated with the inversion of basement structures only played a subordinate role during the latest deformation phase after 8 Ma. Based on cumulative shortening values derived from balanced cross sections, our U‐Pb ages of syn‐tectonic calcite slickenfibres allow to estimate thin‐skinned deformation rates for the easternmost Jura Mountains between ∼0.9 and ∼0.1 mm/year, decreasing toward the eastern tip of the arcuate belt. Moreover, deformation rates seemingly decreased over time with rates of initial thin‐skinned thrusting being significantly higher than the later deformation north of the main thrust front. These new findings from a classical foreland setting highlight the potential of integrating U‐Pb dating in regional fold‐and‐thrust belt investigations elsewhere.

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Section: Methodsmentioning

confidence: 59%

Section: Regional Deformation Style and Influence Of Basement Structuresmentioning

confidence: 79%

Reconstructing the Evolution of Foreland Fold‐And‐Thrust Belts Using U‐Pb Calcite Dating: An Integrated Case‐Study From the Easternmost Jura Mountains (Switzerland)

Madritsch,

Looser,

Schneeberger

et al. 2024

Tectonics

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“…A compressive force Q is applied on the southern end of the cross-sections (red arrows in gure 2). The hypothesis that the Jura fold-and-thrust belt is currently submitted to compressive deformation is supported by focal mechanisms and paleotectonic studies which indicate a general NW-SE direction of compression throughout the region and even beyond, to the North and West of the Bresse and Rhine grabens respectively, as recently summarised by Radaideh and Mosar (2021). In the south-west of the Jura, the compression is slightly rotated towards the west, trending WNW-ESE (Kastrup et al, 2004;Rabin et al, 2018).…”

Section: Prototypesmentioning

confidence: 82%

“…Concerning the stress state, throughout the belt, focal mechanisms point to a strike-slip to thrusting mode with a more or less radial azimuth evolving from WNW-ESE compression in the west and south of the belt to NNW-SSE in the east (Kastrup et al, 2004;Rabin et al, 2018;Radaideh and Mosar, 2021). This strike-slip mode, involving the basement by reactivation of Permo-Carboniferous troughs, is interpreted by Mock and Herwegh (2017) as a transition toward a thrusting mode delaminating the crust up to the Molasse basin and the Jura belt, after the detachment of the subducting european mantle.…”

Section: Emplacement Of the Jura Fold-and-thrust Beltmentioning

confidence: 99%

Parametric mechanical analysis of thin- versus thick-skinned tectonics applied to the Jura belt

Caër¹,

Maillot²,

Leturmy³

et al. 2023

BSGF - Earth Sci. Bull.

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Field observations and seismic interpretations testify that the front of the Jura fold-and-thrust belt is still submitted to compressive deformation, but whether the basement is deforming (thick-skin) or not (thin-skin) remains an open question. We propose a mechanical point of view using the Kinematic approach of the Limit Analysis theory (KLA). We first draw cross-sections containing a major shallow décollement level in the triassic evaporites, including the Alps up to the topographic maximum and including the whole crust. We submit the cross-sections to a compressive force at their southern end, and the KLA determines the location and geometry of the incipient ruptures by optimisation of the associated compressive force, accounting for mechanical balance and the rock strength (Coulomb criterion). Five cross-sections span the whole Jura from west to East, allowing us to explore the lateral variations. From the analysis of five hundred simulations (one hundred for each cross section), varying the friction angles on the Triassic décollement and of the lower crust between 1 deg and 10 deg, we have identified five types of tectonics at the Jura front depending on the emergence of a basement thrust beyond the Jura front (type 1), at the Jura front (type 2) with simultaneous activation of the shallow décollement (type 3), or south of the Jura front (type 5), with activation of the shallow décollement at the Jura front (type 4). The analysis allows us to draw two conclusions. First, the transitions between the various tectonic styles occur abruptly upon continuous changes in the friction parameters, revealing a threshold behaviour that we interpret as an extension of the concept of wedge criticality in the Critical Coulomb Wedge theory: at criticality, several tectonic types may occur within a narrow, critical, range of parameter values. Second, the critical range evolves sytematically between cross-sections, in such a way that the front of the thick-skinned deformation crosses laterally the Jura belt. The two most western cross-section exhibit only thin skin or no tectonics at the Jura front (types 1, 4 and 5), the central one hosts all five styles, and the two Eastern ones show thick-skin solutions (1, 2, 3), for all values tested. We also show that a thick-skinned tectonic style can be accompanied by a simultaneous activation of the shallow triassic décollement (type 4), complicating the interpretation of apparent thin-skin field structures. Modifications of our cross-sections to explore the effect of a bumpy upper/lower crust interface, or of a major décollement at the upper/lower crust interface show the robustness of our conclusions. They only modify slightly the critical ranges at which the tectonic changes occur. These findings may serve as guides, or first order questions, for more sophisticated mechanical approaches including temperature and rate dependent rheologies and the three dimensions of space.

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“…Structural analysis of fault kinematic indicators is an important means to determine fault kinematics (e.g., Benavente et al., 2021; Radaideh & Mosar, 2021). We collected data in the field from exposed bedrock fault planes that exhibited slickensides in three localities along the fault, which consists of dip and dip azimuth of the fault plane and rakes of slickenlines.…”

Section: Methodsmentioning

confidence: 99%

Direct Evidence for Dextral Shearing in the Shanxi Graben System: Geologic and Geomorphologic Constraints From the North Liulengshan Fault

Luo

Schoenbohm

et al. 2022

Tectonics

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North China is an ancient craton (i.e., North China Craton) in eastern continental Asia, consisting of two main tectonic blocks, the Ordos Block in the west and the North China Plain in the east (Figure 1; Zhao et al., 2005). Since its formation in the Precambrian, the North China Craton had maintained long-term tectonic stability. However, from the late Mesozoic to the Cenozoic, it has undergone tremendous craton destruction and gradually lost its stability, particularly in its eastern part (

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Cenozoic Tectonic Deformation Along the Pontarlier Strike‐Slip Fault Zone (Swiss and French Jura Fold‐and‐Thrust Belt): Insights From Paleostress and Geomorphic Analyses

Cited by 7 publications

References 197 publications

Reconstructing the Evolution of Foreland Fold‐And‐Thrust Belts Using U‐Pb Calcite Dating: An Integrated Case‐Study From the Easternmost Jura Mountains (Switzerland)

Reconstructing the Evolution of Foreland Fold‐And‐Thrust Belts Using U‐Pb Calcite Dating: An Integrated Case‐Study From the Easternmost Jura Mountains (Switzerland)

Parametric mechanical analysis of thin- versus thick-skinned tectonics applied to the Jura belt

Direct Evidence for Dextral Shearing in the Shanxi Graben System: Geologic and Geomorphologic Constraints From the North Liulengshan Fault

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