Clutch tectonics and the partial attachment of lithospheric layers

Tikoff, Basil; Teyssier, C.; Waters, Ch.

doi:10.5194/smsps-1-57-2002

Cited by 34 publications

(29 citation statements)

References 53 publications

(56 reference statements)

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“…Models of decoupling layers within the lithosphere have been developed, e.g. by Tikoff et al (2002) and Regenauer-Lieb et al (2006). Besides the deep decoupling zone in the lowermost crust, attributed to a rheological contrast between the quartz/plagioclase and olivine discussed by both groups of authors, the latter authors suggest that stress localization focused on the brittle-ductile transition leads to the development of a pronounced weak zone at about 14 km.…”

Section: Control Of Crust Tectonics By Character Of Mantle Boundariesmentioning

confidence: 98%

Bottom to top lithosphere structure and evolution of western Eger Rift (Central Europe)

Babuška

Fiala

Plomerová

2009

Int J Earth Sci (Geol Rundsch)

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We present model of the structure and development of the entire lithosphere beneath the western Eger Rift (ER). Its crustal architecture and paths of volcanic products are closely related to sutures/boundaries of uppermost mantle domains distinguished by different orientations of olivine fabric, derived from 3-D analysis of seismic anisotropy. Three different fabrics of the mantle lithosphere belong to the Saxothuringian (ST), Teplá-Barrandian (TB) and Moldanubian (MD) microplates assembled during the Variscan orogeny. Dipping fossil (pre-assembly) olivine orientations, consistent within each unit, do not support any voluminous mantle delamination. The variable rift structure and morphology depend on the character of the pre-rift suture between the northern ST unit and the TB/MD units in the southern rift flank. The proper rift with typical graben morphology has developed above the steep lithosphere-scale suture between the ST and TB units. This subduction-related boundary originated from the closure of the ST Ocean. Parts of the crust and mantle lithosphere were dragged there into asthenospheric depths and then rapidly uplifted. The suture is marked by abrupt change in the mantle fabric and sharp gradients in regional gravity field and in metamorphic grade. The secular TBside-down normal movement is reflected in deep sedimentary basins, which developed since the Carboniferous to Cenozoic and in topography. The graben morphology of the ER terminates above the ''triple junction'' of the ST, TB and MD mantle lithospheres. The junction is characterized by offsets of surface boundaries of the tectonic units from their mantle counterparts indicating a detachment of the rigid upper crust from the mantle lithosphere. The southwest continuation of the rift features in Bavaria is expressed in occurrences of Cenozoic sediments and volcanics above an inclined broad transition zone between the ST and MD lithospheres. Schematic scenario of evolution of the region consists mainly of a subduction of the ST lithosphere to depths around 140 km, exhumation of HP-HT rocks and the post-tectonic granitoid plutonism.

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Section: Control Of Crust Tectonics By Character Of Mantle Boundariesmentioning

confidence: 98%

Bottom to top lithosphere structure and evolution of western Eger Rift (Central Europe)

Babuška

Fiala

Plomerová

2009

Int J Earth Sci (Geol Rundsch)

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“…The predominance of subhorizontal fabrics (rather than vertical geometry expected for strike slip faults in the brittle upper crust) is considered to be either (1) an expression of coupling between crustal layers of contrasting compentency (e.g., metatexite versus diatexite plus leucogranite) that accommodates strain by different mechanisms (e.g., Tikoff et al, 2002), or (2) accentuation of vertical shortening at the "melt propagation front" for melt-rich diatexite-leucogranite as melt-rich material migrated upward and was arrested at the thermal or permeability boundary (e.g., Sawyer, 2001) represented by metatexite (Figure 8) or (3) a change in orientation of the shortening axis of strain due to unroofing, to coincide with direction of gravitational load.…”

Section: Figurementioning

confidence: 99%

Tectonics of the West Antarctic rift system: new light on the history and dynamics of distributed intracontinental extension

Siddoway¹

2007

Open-File Report

109

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“…The upper and lower crusts may be mechanically coupled to various degrees, in such a way that deformation is differently expressed in each layer while partial structural continuity and kinematic compatibility are maintained between them. The transition between these two crustal layers defines an attachment zone (Tikoff et al, 2002. In case of complete decoupling, the attachment becomes a décollement or a detachment.…”

Section: Introductionmentioning

confidence: 99%

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

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-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.

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Clutch tectonics and the partial attachment of lithospheric layers

Cited by 34 publications

References 53 publications

Bottom to top lithosphere structure and evolution of western Eger Rift (Central Europe)

Bottom to top lithosphere structure and evolution of western Eger Rift (Central Europe)

Tectonics of the West Antarctic rift system: new light on the history and dynamics of distributed intracontinental extension

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

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