Paleomagnetic evidence for dextral strike-slip motion in the Pyrenees during alpine convergence (Mauléon basin, France)

Oliva‐Urcia, Belén; Sáinz, Antonio María Casas; Pueyo, Emilio L.; Román‐Berdiel, Teresa; Geissman, J. W.

doi:10.1016/j.tecto.2010.09.018

Cited by 13 publications

(8 citation statements)

References 98 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Magnetite and iron sulphides in the North Pyrenean Zone were previously described by Oliva-Urcia et al (2010) in the Mauléon Basin (to the west of our study area, see location in Figure 2). To better precise the iron sulphide types present in the CB, we ran low-temperature magnetization experiments in samples collected along the Albian marls, following the protocol proposed by Aubourg and Pozzi (2010).…”

Section: 1029/2019tc005719supporting

confidence: 66%

“…In the study area, the polarity of remagnetizations helps in constraining the age of remagnetization events. The polarity of the MT remagnetized component across the CB is dominantly reverse, as also defined in the Mauléon Basin (Oliva-Urcia et al, 2010). This reverse polarity indicates that the pyrrhotite-carried remagnetization was locked after the long C34 normal polarity chron (124-84 Ma) (Gradstein et al, 2012), coevally to plate convergence stages ( Figure 11).…”

Section: Age Of the Remagnetizationmentioning

confidence: 71%

See 1 more Smart Citation

Preorogenic Folds and Syn‐Orogenic Basement Tilts in an Inverted Hyperextended Margin: The Northern Pyrenees Case Study

et al. 2020

View full text Add to dashboard Cite

The Chaînons Béarnais (CB, North Pyrenean Zone) resulted from the Cenozoic contractional reactivation of the salt tectonics‐bearing, hyperextended margin that initiated at the Europe‐Iberia transition during the Early Cretaceous. In this tectonic scenario, assessing the relative contribution of extension and contraction to the present‐day structure is crucial to reconstruct the hyperextended margin geometry and to quantify the subsequent shortening. This study undertakes this issue by defining the relationship between folding and two bedding‐independent references: peak temperature isotherms and paleomagnetic data. Isotherms were reconstructed from 76 new measurements of Raman spectroscopy on carbonaceous materials (RSCM) and indicate temperatures at the time of peak metamorphism in the CB (110–85 Ma, end of extension). They are shallowly to moderately northwards dipping and cut across most of the folds deforming the Mesozoic units. Paleomagnetic data from 29 sites evidence a widespread remagnetization carried by pyrrhotite that was probably blocked during the early Paleogene (before the onset of continental collision) and postdated folding in the CB. Abnormal inclinations in this remagnetization suggest syn‐collision tilts up to 60° to the north in the back limb of the Axial Zone. Based on the presented data set, we propose that the folding of the cover above the evaporitic décollement was almost fully completed by the end of the Cretaceous extension, with ~85–100% of the dip of fold limbs being acquired before the remagnetization time. Cenozoic contraction reactivated the extensional faults in the shallow basement as top‐to‐the‐S thrusts, leading to the passive transport and northwards tilting of the folded cover.

show abstract

Section: 1029/2019tc005719supporting

confidence: 66%

Section: Age Of the Remagnetizationmentioning

confidence: 71%

Preorogenic Folds and Syn‐Orogenic Basement Tilts in an Inverted Hyperextended Margin: The Northern Pyrenees Case Study

et al. 2020

View full text Add to dashboard Cite

show abstract

“…A more detailed discussion of the exhumation of the granulites and their importance in establishing the kinematics and timing of detachment faulting and related thermal structure can be found in chapter 10. Kinematic data from the supra-salt cover have also been interpreted to show E-W directed movements of the supra-salt cover (Oliva-Urcia et al, 2010;Ford and Vergès, 2021). However, whether the latter data can be used to determine the local pre-salt basement deformation as well as the larger scale plate kinematic transport directions, or are only related to salt tectonics remains questionable.…”

Section: Multistage Mesozoic Rifting At the Junction Between N-atlantic And Alpine Tethysmentioning

confidence: 99%

The role of inheritance in forming rifts and rifted margins and building collisional orogens: a Biscay-Pyrenean perspective

Manatschal¹,

Chenin²,

Lescoutre³

et al. 2021

BSGF - Earth Sci. Bull.

View full text Add to dashboard Cite

The aim of this paper is to provide a conceptual framework that integrates the role of inheritance in the study of rifts, rifted margins and collisional orogens based on the work done in the OROGEN project, which focuses on the Biscay-Pyrenean system. The Biscay-Pyrenean rift system resulted from a complex multistage rift evolution that developed over a complex lithosphere pre-structured by the Variscan orogenic cycle. There is a general agreement that the Pyrenean-Cantabrian orogen resulted from the reactivation of an increasingly mature rift system along-strike, ranging from a mature rifted margin in the west to an immature and segmented hyperextended rift in the east. However, different models have been proposed to explain the preceding syn-rift evolution and its influence on the subsequent reactivation. Results from the OROGEN project show a sequential reactivation of rift inherited decoupling horizons and identify the specific role of exhumed mantle, hyperextended and necking domains during reactivation. They also highlight the contrasting fate of segment centres vs. segment boundaries during convergence, explaining the non-cylindricity of internal parts of collisional orogens. Results from the OROGEN project also suggest that the role of inheritance is more important during the initial stages of subduction and collision, which may explain the complexity of internal parts of orogenic systems. In contrast, once tectonic systems get more mature, orogenic evolution becomes mostly controlled by first-order physical processes as described in the Coulomb Wedge theory for instance. This may account for the simpler and more continuous architecture of external parts of collisional orogens. It may also explain why most numerical models can reproduce mature orogenic and rift architectures with better accuracy compared to the initial stages of such systems. Thus, while inheritance may not explain steady-state processes, it is a prerequisite for comprehending the initial stages of tectonic systems. The new concepts developed from the OROGEN research are now ready to be tested at other orogenic systems that result from the reactivation of rifted margins, such as the Alps, the Colombian cordilleras and the Caribbean, Taiwan, Oman, Zagros or Timor.

show abstract

“…In the North Pyrenean Zone (France, Fig. 1B), paleomagnetic data are scarcer and evidence strong (over 70° CW in Aptian-Albian rocks, Oliva- Urcia et al, 2010;Rouvier et al, 2012) to null (Izquierdo-Llavall et al, 2020) vertical axis rotations in different areas.…”

Section: Paleomagnetism In the Pyreneesmentioning

confidence: 99%

Paleomagnetism from multi-orogenic terranes is "not a simple game": Pyrenees' Paleozoic warning

Pastor‐Galán¹,

Groenhof²,

Pueyo³

et al. 2021

Preprint

View full text Add to dashboard Cite

Paleomagnetism is a versatile tool in the Earth sciences: it provides critical input to geological time scales and plate tectonic reconstructions. Despite its undeniable perks, paleomagnetism is not without complications. Remagnetizations overprinting the original magnetic signature of rocks are frequent, especially in orogens which tend to be the areas with better rock exposure. Unraveling the magnetic history of the rocks is a complicated task, especially in areas that underwent several orogenic pulses. In turn, constraining the timing of remagnetization represents an opportunity to solve post-magnetization structural and tectonic kinematics. Here, we evaluate the magnetization history of Silurian-Devonian carbonates from the Axial Zone of the Pyrenees. The Pyrenees are a multi-orogenic mountain belt where Silurian-Devonian rocks have seen the Variscan collision (late Paleozoic), the opening of the Atlantic / Bay of Biscay (early Cretaceous) and the Alpine orogeny (late Cretaceous to Miocene). Our results show widespread remagnetization(s) carried by magnetite and pyrrhotite in the Silurian-Devonian series of the Pyrenees. The majority of the samples show a post-folding but pre-alpine tilting magnetization. Considering the equatorial inclinations found in such samples, we suggest that they likely acquired their magnetization during the late Carboniferous and early Permian times. Two of the studied sites (located at the western Axial Zone) were subsequently remagnetized at the end of the Alpine orogeny. The paleomagnetic results constrained that the Variscan orogeny was responsible for the main folding event affecting Paleozoic rocks in the Axial Zone, whereas the Alpine orogeny produced the large-scale thrusting and antiformal stacking of these units. In addition, we observed a general clockwise rotational pattern which could be related with the formation of the Cantabrian Orocline and/or rotations associated with the Alpine orogeny. The Silurian-Devonian carbonates are thus useful to understand the tectonic evolution of the Pyrenean mountain range after a systematic combination of paleomagnetism with structural and petrological observations. In contrast, the secondary character of magnetization and complications associated with the Variscan tectonics indicate that a reassessment of Siluro-Devonian poles from the Variscan elsewhere in Europe might be appropriate.

show abstract

Paleomagnetic evidence for dextral strike-slip motion in the Pyrenees during alpine convergence (Mauléon basin, France)

Cited by 13 publications

References 98 publications

Preorogenic Folds and Syn‐Orogenic Basement Tilts in an Inverted Hyperextended Margin: The Northern Pyrenees Case Study

Preorogenic Folds and Syn‐Orogenic Basement Tilts in an Inverted Hyperextended Margin: The Northern Pyrenees Case Study

The role of inheritance in forming rifts and rifted margins and building collisional orogens: a Biscay-Pyrenean perspective

Paleomagnetism from multi-orogenic terranes is "not a simple game": Pyrenees' Paleozoic warning

Contact Info

Product

Resources

About