Is there a time lag between the metamorphism and emplacement of plutons in the Axial Zone of the Pyrenees?

Esteban, José Julián; Aranguren, A.; Cuevas, Julia; Hilario, Asier; Tubía, José María; Larionov, A. N.; Сергеев, С. А.

doi:10.1017/s001675681500014x

Cited by 24 publications

(41 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…320 Ma; e.g., Aguilar et al, 2014), whereas bulk inhomogeneous transpression and syn-kinematic pluton emplacements in the superstructure lasted from ∼310 to 290 Ma. This geochronological overlap is also documented at the scale of specific domes/plutons such as the Lys-Caillaouas dome (Esteban et al, 2015), La Jonquera pluton (Aguilar et al, 2015) and the Aston dome (Denèle et al, 2009(Denèle et al, , 2014 Fig. 2).…”

Section: Structural Synthesismentioning

confidence: 80%

“…Those later authors interpreted the ∼340 Ma (Visean) ages as that of an inherited crustal component in those granites instead of that of their magmatic crystallization. Esteban et al (2015) distinguished two U-Pb zircon age groups in the Lys-Caillaouas pluton (Fig. 2) intruding the roof of the infrastructure at 307 ± 3 Ma and 300 ± 2 Ma, and suggested that the first group dated metamorphism and the second pluton crystallization.…”

Section: Pszmentioning

confidence: 99%

“…2-4, cross-section 2). The dome is made of paragneisses (locally migmatitic) hosting the LysCaillaouas pluton, which consists of a dioritic core surrounded by granites (Clin et al, 1986;Hilario-Or us, 2004) that ultimately crystallized at 300 ± 2 Ma (zircon SIMS U-Pb date of Esteban et al, 2015). The pluton is a sill interleaved within the paragneisses that roots into the Esera-Gistain shear zone, which truncates and bounds the dome to the South (Fig.…”

Section: The Lys-caillaouas Domementioning

confidence: 99%

“…3a and 11). Given the 307 ± 3 Ma SIMS U-Pb age of metamorphic zircons of the plutonic complex (Esteban et al, 2015) and the final crystallization age of the pluton (300 ± 2 Ma), longitudinal stretching and transtensional exhumation must have been active since ca. 310 Ma and continued until after 300 Ma, considering that shearing occurred in the transtensional shear zones until after cooling from high temperature.…”

Section: The Lys-caillaouas Domementioning

confidence: 99%

See 3 more Smart Citations

Vertical strain partitioning in hot Variscan crust: Syn-convergence escape of the Pyrenees in the Iberian-Armorican syntax

Cochelin

Chardon

Denèle

et al. 2017

Bull. Soc. géol. Fr.

110

View full text Add to dashboard Cite

-A new structural map of the Paleozoic crust of the Pyrenees based on an extensive compilation and new kinematic data allows for the evaluation of the mechanical coupling between the upper and lower crust of the abnormally hot foreland of the Variscan orogen of SW Europe. We document partitioning between coeval lower crustal lateral flow and upper crustal thickening between 310 and 290 Ma under an overall dextral transpressive regime. Partitioning also involved syn-convergence transtensional gneiss domes emplacement during this period. Late orogen-normal shortening of the domes and strain localization in steep crustal-scale transpressive shear zones reflects increasing coupling between the lower crust and the upper crust. The combination of dextral transpression and eastward flow in the Pyrenees results from the shortening and lateral escape of a hot buoyant crust along the inner northern limb of the closing Cantabrian orocline at the core of the Iberian-Armorican arc between ca. 305 and 295 Ma. Delamination or thermal erosion of the lithosphere enhanced orocline closure and explains (1) the switch from crust-to mantlederived magmatism in the Iberian-Armorican arc and (2) the abnormally hot and soft character of the Pyrenean crust that escaped the closing syntax.Keywords: Variscan / Pyrenees / syntax / orocline / gneiss dome / transpression / hot orogen Résumé -Partitionnement vertical de la déformation dans la croûte varisque chaude : échappement des Pyrénées de la syntaxe ibéro-armoricaine. Une nouvelle carte structurale harmonisée et une série de coupes de la croûte paléozoïque des Pyrénées sont présentées sur la base d'une compilation et de nouvelles observations de terrain. Cette carte permet d'évaluer les modalités du couplage mécanique entre la croûte supérieure et la croûte inférieure de l'avant-pays anormalement chaud de l'orogène varisque. La croûte inférieure a flué latéralement pendant l'épaississement de la croûte supérieure dans un contexte transpressif dextre entre 310 et 290 Ma. Dans ce contexte convergent et grâce à un couplage crustal partiel, la croûte inférieure a pu être partiellement exhumée dans des dômes gneissiques transtensifs. Le serrage tardif des dômes et la localisation progressive de la déformation dans des zones de cisaillement transpressives d'ampleur régionale attestent de l'augmentation du degré de couplage entre croûtes supérieure et inférieure pendant le refroidissement régional. La combinaison de la transpression dextre et du fluage latéral de la croûte des Pyrénées résulte du raccourcissement et de l'échappement du matériau piégé dans la syntaxe ibéro-armoricaine lors de son amplification et la fermeture de l'orocline cantabrique en son coeur entre 305 et 295 Ma. L'érosion thermique ou la délamination du manteau lithosphérique a permis (1) la transition entre un magmatisme crustal et un magmatisme mantellique ou hybride dans la syntaxe et (2) la fermeture de l'orocline et l'échappement contemporain du matériel pyrénéen chaud qu'elle contenait.

show abstract

Section: Structural Synthesismentioning

confidence: 80%

Section: Pszmentioning

confidence: 99%

Section: The Lys-caillaouas Domementioning

confidence: 99%

Section: The Lys-caillaouas Domementioning

confidence: 99%

See 2 more Smart Citations

Vertical strain partitioning in hot Variscan crust: Syn-convergence escape of the Pyrenees in the Iberian-Armorican syntax

Cochelin

Chardon

Denèle

et al. 2017

Bull. Soc. géol. Fr.

110

View full text Add to dashboard Cite

show abstract

“…Indeed, the “deep‐seated” granitoids have provided two well‐differentiated isotopic ages using U–Pb zircon/monazite dating: Late Carboniferous ages. An age of 306 ± 2 Ma (U–Pb LA‐ICP‐MS) found by Denèle et al () in the Ax‐les‐Thermes granitoid (Aston dome), and another of 300 ± 2 Ma (U–Pb SIMS SHRIMP) by Esteban et al () in two facies of the Lys‐Caillaouas granitoid (Lys‐Caillaous Massif). Early Carboniferous (Visean) ages of ca. 337–339 Ma (U–Pb LA‐ICP‐MS) found by Mezger and Gerdes () in the Saulcen (Aston dome) and different facies of the Bossòst granitoids (Garona Dome). The disagreement in the age of emplacement of these granitoids is odd since it is always related to similar deformation and metamorphic events along the Axial Zone (Denèle et al, ; Hilario, ; Mezger & Passchier, ; Mezger & Gerdes, ).…”

Section: Introductionmentioning

confidence: 86%

The significance of early Permian and early Carboniferous U–Pb zircon ages in the Bossòst and Lys‐Caillaouas granitoids (Pyrenean Axial Zone)

2018

View full text Add to dashboard Cite

The Axial Zone of the Alpine Pyrenees exposes Ediacaran‐Palaeozoic metasediments and orthogneisses intruded by abundant Variscan granitoids that resulted in elongated HT metamorphic domes separated by tight synforms with low‐grade metasediments. Yet, the age of the granitoids within the metamorphic domes remains debated, hindering the correlation of Variscan deformation stages and the HT metamorphism between the different domes. Here, we dated two granitoids located within classical metamorphic domes using U–Pb LA‐ICP‐MS zircon geochronology: the Bossòst and the Lys‐Caillaouas granitoids in the Garona and Lys‐Caillaouas domes, respectively. The results indicate that the leucogranitic facies of both granitoids have Early Permian crystallization ages at 295 ± 2 Ma and 297 ± 2 Ma, respectively. Furthermore, we found a small population of inherited zircon with Serpukhovian (331–323 Ma) ages in the Lys‐Caillaouas granitoid, reinforcing the existence of an elusive but widespread early Carboniferous magmatic event in the Pyrenees. These ages discard two previous hypotheses explaining the age disparity observed in the different domes: either that the HT‐LP metamorphism is of Visean age only or that the dome formation was diachronous along the Axial Zone, ranging from Visean in the central part to late Carboniferous in the eastern Axial Zone. The early Permian age found in the leucogranitic facies of the Bossòst granitoid questions the proposed Visean age for the formation of the Garona dome and the peak HT‐LP metamorphism and points to an Early Permian age as most likely in line with what is observed in the Lys‐Caillaouas Massif.

show abstract

Late‐Orogenic Structural Reorganization of the Variscan Belt during the Upper Carboniferous

DENÈLE,

COCHELIN

2023

The Variscan Belt of Western Europe 2

View full text Add to dashboard Cite

Is there a time lag between the metamorphism and emplacement of plutons in the Axial Zone of the Pyrenees?

Cited by 24 publications

References 28 publications

Vertical strain partitioning in hot Variscan crust: Syn-convergence escape of the Pyrenees in the Iberian-Armorican syntax

Vertical strain partitioning in hot Variscan crust: Syn-convergence escape of the Pyrenees in the Iberian-Armorican syntax

The significance of early Permian and early Carboniferous U–Pb zircon ages in the Bossòst and Lys‐Caillaouas granitoids (Pyrenean Axial Zone)

Late‐Orogenic Structural Reorganization of the Variscan Belt during the Upper Carboniferous

Contact Info

Product

Resources

About