Modele de bassin triangulaire a l'intersection de decrochements divergents pour le fosse albo-cenomanien de la Ballongue (zone nord-pyreneenne, France)

Debroas, Elie-Jean

doi:10.2113/gssgfbull.iii.5.887

Cited by 71 publications

(55 citation statements)

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“…Both groups of middle Cretaceous ZHe ages fall within error into the time span over which heating is expected to occur over the whole Pyrenean realm based on the following: (i) stratigraphically constrained rifting (114-97 Ma; Debroas, 1987Debroas, , 1990, (ii) the HT-LP event recorded in the eastern Metamorphic Internal Zone (113-95 Ma; Albarède & Michard-Vitrac, 1978;Golberg & Leyreloup, 1990;Montigny et al, 1986), (iii) the widespread hydrothermal fluid circulation in North Pyrenean basement massifs (117-92 Ma; Boutin et al, 2016, and references therein), (iv) partial to total resetting of the 40 Ar-39 Ar isotopic system in biotite and muscovite in mylonitic zones of the Agly basement (110-100 Ma; work by R. Nicolas cited in Clerc et al, 2015), and (v) mantle exhumation in the northwestern Pyrenees (108-105 Ma; Masini et al, 2014). On the other hand, temperatures inferred from the ZHe system in this study (140-250°C and inverse modeling results) are far below (i) estimated RSCM temperatures in strata of Boucheville and Bas-Agly synforms (350-600°C; Chelalou, 2015;Chelalou et al, 2016;Ducoux, 2017;Vauchez et al, 2013) as well as in pockets of similar lithologies within the Agly Massif (400-450°C; Ducoux, 2017) and (ii) temperature conditions for albitization (350-450°C; Boulvais et al, 2007;Pascal, 1979;Poujol et al, 2010).…”

Section: Thermal Histories Testedmentioning

confidence: 95%

“…This orogeny was followed by two phases of Mesozoic extension or transtension, the first occurring from Triassic to Late Jurassic in an east-west zone linking the Tethys and Central Atlantic oceans (e.g., Curnelle et al, 1980). Rifting from late Aptian to early-to-middle Cenomanian (114-97 Ma) then created deep marine depocenters (Debroas, 1987(Debroas, , 1990, adjacent to the North Pyrenean basement massifs and associated with exhumation of mantle rocks (Azambre & Ravier, 1978;Clerc et al, 2012;Lagabrielle et al, 2010;Lagabrielle & Bodinier, 2008).…”

Section: Geological Settingmentioning

confidence: 99%

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Thermochronological Evidence of Early Orogenesis, Eastern Pyrenees, France

et al. 2019

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In collisional orogens, distinguishing the thermal signature of early orogenesis from the preceding rift or from subsequent thermal events is a major challenge. We present an integrated geological and low‐temperature thermochronology study of the Paleozoic Agly‐Salvezines crustal block in the retrowedge of the eastern Pyrenees (France). The northern Pyrenees preserves one of the best geological records of a rift‐to‐collision transition. The Agly‐Salvezines block represents the inverted distal European margin of an Aptian–Cenomanian rift system. Seventeen samples were collected throughout the external orogenic massif and analyzed for low‐temperature thermochronology: zircon (U‐Th)/He dating documents the cooling history of the massif during the initiation and early phase of Pyrenean convergence, while apatite (U‐Th)/He dating completes the record of plate collision. Using inverse and forward modeling of new low‐temperature thermochronology data, we show that the Pyrenean retrowedge records two clear phases of orogenic cooling, Late Campanian–Maastrichtian and Ypresian–Bartonian, which we relate to early inversion of the distal rifted margin and main collision, respectively. An earlier, late Aptian–Turonian cooling history is detected, possibly related to rifting and/or postrift. No cooling is evidenced during the Paleocene during which tectonic quiescence is recorded in the adjacent Aquitaine retroforeland basin. Using our low‐temperature thermochronology data and geological constraints, we propose a crustal‐scale sequentially restored model for the tectonic and thermal transition from extension to peak orogenesis in the eastern Pyrenees, which suggests that both thrusting and underplating processes contributed to early inversion of the Aptian–Cenomanian rift system.

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Section: Thermal Histories Testedmentioning

confidence: 95%

Section: Geological Settingmentioning

confidence: 99%

Thermochronological Evidence of Early Orogenesis, Eastern Pyrenees, France

et al. 2019

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“…Hyperextension only initiated in the late Aptian to Albian time in the Pyrenean-Basque-Cantabrian rift Lagabrielle et al, 2010] coinciding with the onset of seafloor spreading in the Bay of Biscay . The sedimentary record preserved in the Pyrenean-Cantabrian orogen indicates a progressive deepening of the basin from late Aptian to mid-Albian (Pyrenees: Debroas [1987Debroas [ , 1990 and Basque-Cantabrian basin: García-Mondéjar et al [1996,2005] In spite of the well-defined NE-SW segmentation, an overall lateral continuity of hyperextended domains can be observed throughout the Pyrenean orogen ( Figure 6). The Pamplona fault represents a major crustal discontinuity [Turner, 1996;Larrasoaña et al, 2003;Jammes et al, 2010c] delimiting the Basque-Cantabrian from the Arzacq-Mauléon basin.…”

Section: The Pyrenean-basque-cantabrian Riftmentioning

confidence: 99%

Formation and deformation of hyperextended rift systems: Insights from rift domain mapping in the Bay of Biscay-Pyrenees

et al. 2014

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The Bay of Biscay and the Pyrenees correspond to a Lower Cretaceous rift system including both oceanic and hyperextended rift domains. The transition from preserved oceanic and rift domains in the West to their complete inversion in the East enables us to study the progressive reactivation of a hyperextended rift system. We use seismic interpretation, gravity inversion, and field mapping to identify and map former rift domains and their subsequent reactivation. We propose a new map and sections across the system illustrating the progressive integration of the rift domains into the orogen. This study aims to provide insights on the formation of hyperextended rift systems and discuss their role during reactivation. Two spatially and temporally distinct rift systems can be distinguished: the Bay of Biscay-Parentis and the Pyrenean-Basque-Cantabrian rifts. While the offshore Bay of Biscay represent a former mature oceanic domain, the fossil remnants of hyperextended domains preserved onshore in the Pyrenean-Cantabrian orogen record distributed extensional deformation partitioned between strongly segmented rift basins. Reactivation initiated in the exhumed mantle domain before it affected the hyperthinned domain. Both domains accommodated most of the shortening. The final architecture of the orogen is acquired once the conjugate necking domains became involved in collisional processes. The complex 3-D architecture of the initial rift system may partly explain the heterogeneous reactivation of the overall system. These results have important implications for the formation and reactivation of hyperextended rift systems and for the restoration of the Bay of Biscay and Pyrenean domains.

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“…The geometry of the Early Cretaceous rift system is still debated (e.g., Clerc & Lagabrielle, 2014;Debroas, 1987Debroas, , 1990Masini et al, 2014;Teixell et al, 2016;Tugend et al, 2014). Rifting created a complex distribution of depocenters now preserved both in the foreland and in the NPZ where they are strongly inverted (e.g., Debroas, 1987Debroas, , 1990Masini et al, 2014).…”

Section: Crustal Inheritancementioning

confidence: 99%

Lateral Variations in Foreland Flexure of a Rifted Continental Margin: The Aquitaine Basin (SW France)

Angrand¹,

Ford²,

Watts

2018

Tectonics

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Rift inheritance can play a key role in foreland basin geometry and behavior. If the foreland basin initiates soon after rifting, thermal cooling can also contribute significantly to subsidence. We investigate the effects of crustal inheritance (Aptian‐Cenomanian rifting) on the evolution of the Campanian to middle Miocene flexural Aquitaine foreland basin, northern Pyrenees, France. Surface and subsurface data define rifted crustal geometry and postrift thermal subsidence. Analysis of Bouguer gravity anomalies coupled with flexural modeling constrains the lateral variations of elastic thickness, plate flexure, and controlling loads. The Aquitaine foreland is divided along‐strike into three sectors. The relative role of surface and subsurface (i.e., buried) loading varies along‐strike, and the elastic thickness values decrease from the northeast (25 km) to the southwest (7 km) where the plate is the most stretched. The eastern foreland crust was not rifted and underwent a simple flexural subsidence in response to orogenesis. The central sector was affected by crustal stretching. Here the basin is modeled by combining topographic and buried loads, with postrift thermal subsidence. In the western sector, the foreland basin was created mainly by postrift thermal subsidence. The eastern and central sectors are separated by the Eastern Crustal Lineament, which is one of a series of inherited transverse faults that segment the orogen.

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Modele de bassin triangulaire a l'intersection de decrochements divergents pour le fosse albo-cenomanien de la Ballongue (zone nord-pyreneenne, France)

Cited by 71 publications

References 0 publications

Thermochronological Evidence of Early Orogenesis, Eastern Pyrenees, France

Thermochronological Evidence of Early Orogenesis, Eastern Pyrenees, France

Formation and deformation of hyperextended rift systems: Insights from rift domain mapping in the Bay of Biscay-Pyrenees

Lateral Variations in Foreland Flexure of a Rifted Continental Margin: The Aquitaine Basin (SW France)

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