Age, duration and mineral markers of magma interactions in the deep crust: an example from the Pyrenees

Vielzeuf, Daniel; Paquette, Jean‐Louis; Clemens, J. D.; Stevens, Gary; Gannoun, Abdelmouhcine; Suchorski, Krzysztof; Saúl, Andrés

doi:10.1007/s00410-021-01789-2

Cited by 9 publications

(7 citation statements)

References 88 publications

(113 reference statements)

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“…A pre-Triassic age for the ductile deformation within the granulites and migmatites from the Ursuya massif was confirmed by Ar/Ar ages on biotite indicating that these rocks cooled below the biotite Ar closure temperature of ~300° at 200 Ma (Masini et al, 2014). Available U-Pb ages indicate that high-temperature metamorphism occurred between 295 and 274 Ma (Hart et al, 2016;Vacherat et al, 2017;Lemirre;2018;Vielzeuf et al, 2021). During this period, strain was localized within the extensional Louhossoa shear zone (Figs.…”

Section: Bimodal Exhumation Of the Ursuya Granulitementioning

confidence: 87%

Review of the syn-rift to early post-rift depositional systems of the Cretaceous Mauléon rift: sedimentary record of continental crust hyperextension and mantle denudation (Western Pyrenees)

Saspiturry¹,

Issautier²,

Razin³

et al. 2021

BSGF - Earth Sci. Bull.

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— The Mauléon basin, in the northwestern Pyrenean belt, is related to Early Cretaceous rifting and continental breakup. Here we review the evolution of depositional environments in the hyperextended Mauléon rift basin during Albian and Cenomanian time. This review includes the lithostratigraphy, regional distribution, boundaries, age and facies sedimentology of the basin’s syn-rift formations and their members. We construct paleogeographic maps to elucidate (1) the 3D distribution of sedimentary facies and depositional environments during the Albian and Cenomanian from the Iberian proximal margin to the hyperextended domain and (2) the link between major extensional structures and sedimentation during rifting and continental breakup. The Mauléon rift was supplied during most of the Albian by sediments from the Iberian proximal margin. The southern margin had a steep and abrupt topographic boundary related to a northward crustal rollover along the south-dipping Saint-Palais detachment. This feature controlled the deposition of base-of-slope conglomerates at the base of the margin that abruptly gave way to low-density turbidites, then hemipelagic deposits in the hyperextended domain. During latest Albian to Early Cenomanian time, continental breakup occurred in the eastern Mauléon basin and the vergence of the detachment systems reversed. Minor debris-flow deposits formed at the foot of fault scarps associated with the newly formed north-dipping detachments. Elsewhere, sediment from deltaic systems to the west in the Saint-Jean-de-Luz area deposited low-density turbidites in the hyperextended domain. During the post-rift stage, the flux of coarse sediment from the detachment footwall gradually declined as deformation waned, and low-density turbidites expanded onto the hyperextended domain from the European Late Cretaceous carbonate platform. These paleogeographic reconstructions, in addition to offering a synthetic view of the evolution of sedimentary environments during rifting, offer new insight into the post-rifting exhumation of the lower crust and mantle.

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Section: Bimodal Exhumation Of the Ursuya Granulitementioning

confidence: 87%

Review of the syn-rift to early post-rift depositional systems of the Cretaceous Mauléon rift: sedimentary record of continental crust hyperextension and mantle denudation (Western Pyrenees)

Saspiturry¹,

Issautier²,

Razin³

et al. 2021

BSGF - Earth Sci. Bull.

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“…This leads to the generation of strongly peraluminous crustal magmas ranging from felsic (leucogranites or MPG, e.g., Nabelek, 2020) to more mafic (cordierite monzogranites or CPG, e.g., Castro et al, 1999). At deeper levels, mafic (noritic and charnockitic) intrusions are generated (Vielzeuf et al, 2021). Hybridization between mantle magmas and crustal melts is minor and only local in migmatites and in MPG.…”

Section: Crustal Magma Generationmentioning

confidence: 99%

“…5). The mafic noritic and charnockitic lower crustal intrusions are products of high degrees of hybridization between mantle and crustal melts (Vielzeuf et al, 2021). KCG originate from differentiation of potassic and magnesian mafic magmas (vaugnerites) combined with melting/assimilation of crustal rocks Castro, 2020).…”

Section: Crustal Magma Generationmentioning

confidence: 99%

“…Peraluminous silicic magmas may represent responses of crustal metasedimentary protoliths to excursions (both in temperature and volatile supply) driven by local intrusions of mafic mantle magmas. Detection of those very short processes, instantaneous at the scale of long-lived migmatites and granitic plutons, represents a challenge (Vielzeuf et al, 2021). The Upwelling of the mantle increases conductive heat transfer to the lower crust.…”

Section: Crustal Magma Generationmentioning

confidence: 99%

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Granite magmatism and mantle filiation

Pichavant,

Villaros,

Michaud

et al. 2024

Eur. J. Mineral.

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Abstract. Current granite magma generation models essentially reduce to two groups: (1) intra-crustal melting and (2) basaltic origin. A mixed, crustal, and basaltic origin and therefore a mantle filiation has been proposed for most granite magma types. In contrast, strongly peraluminous silicic magmas such as two-mica leucogranites have been classically interpreted as products of pure crustal melting. In this paper, we re-examine this interpretation and the evidence for considering leucogranites as unique among granite types. In the first part, some key aspects of the intra-crustal melting model are reviewed. Classical assumptions are discussed, such as the use of migmatites to infer granite generation processes. Our knowledge of crustal melt production is still incomplete, and fluid-present H2O-undersaturated melting should be considered in addition to mica dehydration melting reactions. The source rock remains essential as a concept despite difficulties in the identification of source lithologies from their geochemical and mineralogical signatures. Incorporating spatial and temporal variability at the source and the possibility of external inputs (fluids, magmas) would represent useful evolutions of the model. Thermal considerations bring strong constraints on the intra-crustal melting model since the absence of mafic magmas reduces possible external heat sources for melting. In the second part, the origin of a strongly peraluminous silicic volcanic suite, the Macusani Volcanics (SE Peru), is detailed. Magmas were generated in a mid-crustal anatectic zone characterized by high temperatures and heat fluxes. Crustal metamorphic rocks (metapelites) were dominant in the source region, although Ba-, Sr- and La-rich calcic plagioclase cores and some biotite and sanidine compositions point to the involvement of a mantle component. The heat necessary for melting was supplied by mafic mainly potassic–ultrapotassic magmas which also partly mixed and hybridized with the crustal melts. The Macusani Volcanics provide an example of a crustal peraluminous silicic suite generated with a contribution from the mantle in the form of mafic magmas intruded in the source region. This, as well as the limitations of the intra-crustal melting model, establishes that a mantle filiation is possible for peraluminous leucogranites as for most other crustal (S-, I- and A-type) peraluminous and metaluminous granites. This stresses the critical importance of the mantle for granite generation and opens the way for unification of granite generation processes.

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“…The Pyrenean Axial Zone (PAZ) and the North Pyrenean Zone (NPZ) are separated by the EW-striking North Pyrenean Fault (NPF). These two zones consist of Proterozoic to Paleozoic sedimentary rocks deformed and metamorphosed between the middle Carboniferous and the early Permian (Mezger and Gerdes 2016;Denèle et al 2014;Aguilar et al 2013;Schnapperelle et al 2020;Vacherat et al 2017;Cochelin et al 2021;Cugerone et al 2021;Vielzeuf et al 2021). In both PAZ and NPZ, the Variscan orogeny is associated with a widespread Carboniferous to Permian magmatism (e.g.…”

Section: Geological Settingmentioning

confidence: 99%

Flow of the partially molten crust in the Variscan foreland revealed by U–Th–Pb dating of metamorphism, magmatism and deformation (Agly Massif, Eastern Pyrenees)

Vanardois

Trap

Roger

et al. 2022

Int J Earth Sci (Geol Rundsch)

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In this contribution, we investigate the spatial and temporal evolution of mid-crustal flow in the Agly massif (North Pyrenean Zone) that represents the southern foreland of the Variscan orogenic plateau.In the Agly massif, the middle crust is represented by an Ediacarian-Devonian series of metasedimentary rocks that recorded high-grade metamorphism synchronously with crustal thinning (D2) and dextral wrenching (D3) during Carboniferous. D2 crustal thinning formed a penetrative S2 flat-lying foliation and localized C2 extensional shear zones with a top-to-the-North kinematics. D2 planar fabrics are deformed by a D3 dextral transpression localized into a two-kilometers wide highstrain zone. We performed LA-ICPMS U-Th-Pb dating on zircon and monazite from small magmatic bodies and from metamorphic rocks showing strain features relative to D2 and/or D3. Our results, compiled with published data, argue that the middle crust of the Agly massif reached high-temperature and suprasolidus conditions at ca. 325-320 Ma and was partially molten until ca. 300 Ma. They also indicate that the D2 thinning and top-to-the north shearing was active from ca. 325 to 290 Ma. D2 extension and D3 transpression were synchronous from ca. 308 to 290 Ma. Making a comparison with the Pyrenean Axial Zone, the Montagne Noire and the French Central massif, we propose a two-step tectonic model for the mid-crustal flow with a horizontal flow towards South in both the orogenic plateau and the southern forelands between ca. 325 and 310 Ma and locally reoriented into an E-W longitudinal flow between 310 and 300 Ma in high-strain dextral strike-slip shearing domains.

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Age, duration and mineral markers of magma interactions in the deep crust: an example from the Pyrenees

Cited by 9 publications

References 88 publications

Review of the syn-rift to early post-rift depositional systems of the Cretaceous Mauléon rift: sedimentary record of continental crust hyperextension and mantle denudation (Western Pyrenees)

Review of the syn-rift to early post-rift depositional systems of the Cretaceous Mauléon rift: sedimentary record of continental crust hyperextension and mantle denudation (Western Pyrenees)

Granite magmatism and mantle filiation

Flow of the partially molten crust in the Variscan foreland revealed by U–Th–Pb dating of metamorphism, magmatism and deformation (Agly Massif, Eastern Pyrenees)

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