The tectono-sedimentary evolution of a hyper-extended rift basin: the example of the Arzacq–Mauléon rift system (Western Pyrenees, SW France)

Masini, Emmanuel; Manatschal, Giänreto; Tugend, Julie; Mohn, Geoffroy; Flament, Jean-Marie

doi:10.1007/s00531-014-1023-8

Cited by 150 publications

(330 citation statements)

References 44 publications

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“…11). may also consider the thermal zonation of the NPZ as a consequence of a lateral variation of the mode of opening of the basins. Although the kinematic history of the domain is still poorly constrained, approximately N-S extension is reported from field observations in the western NPZ (Jammes et al, 2009(Jammes et al, , 2010Masini, 2011;Masini et al, 2014), whereas a transcurrent to oblique motion is generally reported in the eastern NPZ (Choukroune et Mattauer, 1978;Debroas, 1990;Debroas, 2003;Clerc et al, 2012, Fig. 5).…”

Section: Spatial Distribution Of the Thermal Anomaly At The Scale Of mentioning

confidence: 97%

“…The basins of the cooler western domain are characterized by well-developed coarse clastic formations related to paleoscarps on the border of the troughs, in relation to high-angle faulting and dominant brittle behavior of the continental crust (e.g., the Igountze and Mendibelza breccias; Boirie 1981; Boirie and Souquet 1982;Masini et al, 2014). In contrast, the central part of these basins is a domain of exhumed mantle capped by tectonic lenses of both ultramafic and sialic compositions tectonically underlying the prerift metasediments.…”

Section: Spatial Distribution Of the Thermal Anomaly At The Scale Of mentioning

confidence: 99%

“…Regional strain partitioning of a transtensional kinematic into orthogonal extension and transcurrent movement within the future NPZ, the Parentis, Cameros, Le Danois, Basque-Cantabrian and Organya-Pedraforca basins may explain the localization of the HT-LP metamorphism in the basins dominated by transtensive movements (central and eastern NPZ, Nappe des Marbres, Fig. 4 , 2010Masini et al, 2014). In addition, we can envisage that various modes of opening induced a variety in hydrothermal circulations.…”

Section: Spatial Distribution Of the Thermal Anomaly At The Scale Of mentioning

confidence: 99%

“…At present, the Pyrenean domain is also considered as hosting relevant analogs of distal passive margins, and its pre-orogenic evolution is being intensely revisited (Lagabrielle and Bodinier, 2008;Jammes et al, 2009;Lagabrielle et al, 2010;Masini 2011;Clerc et al, 2012;Clerc et al, 2013;Masini et al, 2014;Tugend et al, 2014). Unlike the Alpine analog, the North Pyrenean domain did not undergo subduction, and the thermal pattern recorded in the pre-and syn-rift material has not been overprinted by major crustal overthrusts or subductions.…”

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confidence: 99%

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High-temperature metamorphism during extreme thinning of the continental crust: a reappraisal of the North Pyrenean passive paleomargin

et al. 2015

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Abstract. An increasing number of field examples in mountain belts show that the formation of passive margins during extreme continent thinning may occur under conditions of high to very high thermal gradient beneath a thin cover of syn-rift sediments. Orogenic belts resulting from the tectonic inversion of distal margins and regions of exhumed continental mantle may exhibit high-temperature, low-pressure (HT-LP) metamorphism and coeval syn-extensional, ductile deformation. Recent studies have shown that the northern flank of the Pyrenean belt, especially the North Pyrenean Zone, is one of the best examples of such inverted hot, passive margin. In this study, we provide a map of HT-LP metamorphism based on a data set of more than 100 peak-temperature estimates obtained using Raman spectroscopy of the carbonaceous material (RSCM). This data set is completed by previous PT (pressure and temperature) estimates based on mineral assemblages, and new 40 Ar-39 Ar (amphibole, micas) and U-Pb (titanite) ages from metamorphic and magmatic rocks of the North Pyrenean Zone. The implications on the geological evolution of the Cretaceous Pyrenean paleomargins are discussed. Ages range mainly from 110 to 90 Ma, and no westward or eastward propagation of the metamorphism and magmatism can be clearly identified. In contrast, the new data reveal a progressive propagation of the thermal anomaly from the base to the surface of the continental crust. Focusing on the key localities of the Mauléon basin, Arguenos-Moncaup, Lherz, Boucheville and the Bas-Agly, we analyze the thermal conditions prevailing during the Cretaceous crustal thinning. The results are synthetized into a series of three regional thematic maps and into two detailed maps of the Arguenos-Moncaup and Lherz areas. The results indicate a first-order control of the thermal gradient by the intensity of crustal thinning. The highest grades of metamorphism are intimately associated with the areas where subcontinental mantle rocks have been unroofed or exhumed.

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Section: Spatial Distribution Of the Thermal Anomaly At The Scale Of mentioning

confidence: 97%

Section: Spatial Distribution Of the Thermal Anomaly At The Scale Of mentioning

confidence: 99%

Section: Spatial Distribution Of the Thermal Anomaly At The Scale Of mentioning

confidence: 99%

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confidence: 99%

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High-temperature metamorphism during extreme thinning of the continental crust: a reappraisal of the North Pyrenean passive paleomargin

et al. 2015

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“…The occurrence of distinct Albian coarse-grained turbidite systems along the northern margin of the BCB indicates that this basin margin had to be a very narrow margin during the Albian, with relatively short distances between the emerged source areas and the deep-water basins. Moreover, the Andatza turbidite system is similar in terms of processes and products to the contemporaneous Mendibeltza turbidite system of the Pyrenean realm (Souquet et al, 1985), where a narrow southern basin-margin area that fed the Pyrenean basin has been interpreted (Razin, 1989;Masini et al, 2014).…”

Section: Source Of Sedimentsmentioning

confidence: 99%

El sistema turbidítico conglomerático de Andatza (Pirineos occidentales): Estratigrafía, sedimentología y control estructural

Bodego

Agirrezabala

2017

Estud. geol.

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En este trabajo se describe la estratigrafía y sedimentología de la Formación Conglomerados de Andatza. Mediante el análisis de facies se han interpretado tres asociaciones de facies principales correspondientes a un sistema turbidítico (de grano grueso) y al talud: un sistema turbidítico interno (o cañón), un talud fangoso de alto gradiente y otro de bajo gradiente. La distribución cartográfica de las asociaciones de facies junto con el análisis de paleocorrientes describen un modelo sedimentario de sistema turbidítico de grano grueso en forma de “L” para los Conglomerados de Andatza, cuya morfología fue controlada por fallas normales sinsedimentarias de basamento. El carácter grosero del tamaño de grano de este sistema turbidítico indica la proximidad del área fuente de los conglomerados, que alimentaría el cañón turbidítico desde el norte a través de una estrecha plataforma marina.

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Thermal control on the modes of crustal thinning leading to mantle exhumation: Insights from the Cretaceous Pyrenean hot paleomargins

2014

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The prerift Mesozoic sequences of the Cretaceous passive margins fossilized in the North Pyrenean Zone (NPZ) are characterized by high-temperature deformation in relation with thinning of the continental basement. Our compilation of chronological and geological data confirms a clear correlation between the distribution of the highest paleotemperatures in the prerift sedimentary cover and the loci of extreme crustal stretching. Geological evidences such as the occurrence of peridotite bodies directly underlying metamorphic prerift sediments indicate an early attenuation of the rifted continental crust. This leads us to propose a mechanism of rifting involving boudinage of the continental crust. The lateral extraction of the Paleozoic basement occurred under the prerift cover that is decoupled on the Triassic clays and evaporites. The thermal conditions allowing coeval ductile deformation of the crust and of the prerift sediments leaded to the widening of basins devoid of large faulted blocks. We discuss the implications on the origin and significance of the granulites and the relations between flysch deposition and high-temperature metamorphism of the prerift sediments. In the NPZ, Albian-Cenomanian flysch sequences were deposited synchronously with the synmetamorphic ductile deformation of the prerift sequences. Since the base of the flysch deposits also recorded locally the high-temperature tectonic event, we propose an original mechanism for the evolution of the basins involving continuous deformation of the prerift metamorphic sediments. At the scale of the Pyrenean domain, our results suggest a strong lateral variability in the tectonic style of passive margins, in direct link with their thermic pattern.

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The tectono-sedimentary evolution of a hyper-extended rift basin: the example of the Arzacq–Mauléon rift system (Western Pyrenees, SW France)

Cited by 150 publications

References 44 publications

High-temperature metamorphism during extreme thinning of the continental crust: a reappraisal of the North Pyrenean passive paleomargin

High-temperature metamorphism during extreme thinning of the continental crust: a reappraisal of the North Pyrenean passive paleomargin

El sistema turbidítico conglomerático de Andatza (Pirineos occidentales): Estratigrafía, sedimentología y control estructural

Thermal control on the modes of crustal thinning leading to mantle exhumation: Insights from the Cretaceous Pyrenean hot paleomargins

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