Ultrapotassic dykes in the Moldanubian Zone and their significance for understanding of the post-collisional mantle dynamics during Variscan orogeny in the Bohemian Massif

Kubínová, Šárka; Faryad, Shah Wali; Verner, Kryštof; Schmitz, Mark D.; Holub, František V.

doi:10.1016/j.lithos.2016.12.007

Cited by 34 publications

(27 citation statements)

References 86 publications

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“…Models invoked to explain the origin of this magmatic event in the Variscan Belt include: (1) persistent subduction under the Gondwanan margin until ca. 340 Ma (Janoušek and Holub, 2007); (2) slab break-off of the southward-directed subduction of the Rheic oceanic crust (e.g., Kubínová et al, 2017); (3) mantle wedge metasomatism (Finger et al, 2007); (4) late collisional slab sinking and subduction inversion (von Raumer et al, 2014); (5) relamination, rheological weakening, and radiogenic heat (Schulmann et al, 2014); and (6) strike-slip wrenching (Edel, 2001;Rossi et al, 2009). …”

Section: Discussionmentioning

confidence: 99%

“…www.gsapubs.org | Volume 10 | Number 1 | LITHOSPHERE (for discussions on the occurrence, age, and genesis of durbachite and/ or vaugnerite rocks in the Variscan belt of Europe, see Buda et al, 2004;Scarrow et al, 2009;von Raumer et al, 2014;Kubínová et al, 2017). Figure 5 shows some aspects of a broad comparison between the ECS and the POS (Fernández-Suárez et al, 2000.…”

Section: General Geochemical Features and Classification Of The Ecs Gmentioning

confidence: 99%

“…This early Carboniferous suite is widely represented in other areas of the WEVB (e.g., Schaltegger, 1997Schaltegger, , 2000Schulmann et al, 2002;Eichhorn et al, 2000;Cartannaz et al, 2007;Li et al, 2014;Mezger and Gerdes, 2016;Tabaud et al, 2015;Galán et al, 1997;Ledru et al, 2001;Rossi et al, 2009;Kubínová et al, 2017;Laurent et al, 2017;Žák et al, 2017), including the Ossa Morena zone of southwest Iberia (e.g., Dallmeyer et al, 1995;Ordóñez Casado, 1998;Montero et al, 2000;Ordóñez Casado et al, 2008;Romeo et al, 2006;Jesus et al, 2007;Pin et al, 2008;Pereira et al, 2009Pereira et al, , 2015Braid et al, 2012;Dupuis et al, 2014;Gladney et al, 2014;Cambeses et al, 2015). In the Ossa Morena zone rocks belonging to this suite are the volumetrically dominant granitoids, whereas in northwest Iberia the volumetrically dominant granitoids are both the previously described syntectonic leucogranites and the postorogenic granites (Fig.…”

Section: Introductionmentioning

confidence: 99%

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Exhuming a cold case: The early granodiorites of the northwest Iberian Variscan belt—A Visean magmatic flare-up?

et al. 2018

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In this study we report laser ablation-inductively coupled plasma-mass spectrometer U-Pb ages of granitoids from the so-called early granodiorites of the northwest Iberian Variscan belt. The U-Pb results attest to significant magmatic activity in Visean time (ca. 347-337 Ma) that generated a hitherto poorly constrained granitoid suite in the northwest Iberian tract of the western European Variscan belt realm. This early Carboniferous suite (ECS) is mainly composed of peraluminous cold and hot crustal granodiorites and monzogranites with minor associated mafic rocks that attest to minor involvement of mantle melting. Based on the geochronological and geochemical data, we compare the Visean granitoids with younger Variscan granitoids in northwest Iberia and, in view of the tectonothermal scenarios of the Variscan collision in northwest Iberia, propose a model for the genesis of the ECS in northwest Iberia that involves rapid melting upon fast exhumation of the thickened Gondwanan crust in the course of the protracted Variscan collision.

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Section: Discussionmentioning

confidence: 99%

Section: General Geochemical Features and Classification Of The Ecs Gmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Exhuming a cold case: The early granodiorites of the northwest Iberian Variscan belt—A Visean magmatic flare-up?

et al. 2018

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“…The Moldanubian rocks west of the Pelhřimov complex were exhumed above the brittle–ductile transition between ~346–337 Ma (Figure b; Žák et al, , Žák, Sláma, & Burjak, ; Kubínová, Faryad, Verner, Schmitz, & Holub, ). The upper age limit for its exhumation is bracketed by structural relations around melasyenite and melagranite intrusions which cut discordantly across the ductile foliation in their mid‐crustal metapelitic host rocks (336.6 ± 1.0 Ma Tábor pluton, UPb on zircons, Janoušek & Gerdes, ; and dikes dated at 337.9 ± 0.2 Ma, UPb on zircons, Kubínová et al, ).…”

Section: The Pelhřimov Core Complexmentioning

confidence: 99%

Complex mid‐crustal flow within a growing granite–migmatite dome: An example from the Variscan belt illustrated by the anisotropy of magnetic susceptibility and fabric modelling

et al. 2018

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This study describes anisotropy of magnetic susceptibility (AMS) of migmatites associated with crustally derived granites of the Pelhřimov core complex, Bohemian Massif. In combination with numerical modelling, we use this case example to discuss some of the general complexities related to interpreting flow patterns of anatectic lower and middle crust from magnetic fabric during growth of metamorphic domes. Magnetic lineations, reflecting tiling or zone axis of magnetically oblate grains, commonly tend to develop along the principal stretching direction. Our fabric modelling, however, shows that a lineation may also develop at a high angle to the overall flow (tectonic transport) direction as a relict of a pre‐existing fabric or due to a component of core complex axis‐parallel stretching and may be maintained for a significant period of time. Furthermore, we demonstrate that the finite magnetic fabric orientation is largely independent on the initial migmatite fabric intensity (formed before dome growth) but is rather a function of (a) shear strain, causing magnetic foliation and lineation to rotate towards the shear plane, and (b) magnitude of dome growth, causing their external rotation. Similarly, the degree of anisotropy P is also a function of accumulated shear strain and increases over time. These findings suggest that low fabric intensities may point to rapidly cooling, less sheared domains that are more likely to preserve early formed fabrics. In dome limbs undergoing protracted simple shear, low and high degrees of oblateness (as expressed by the shape parameter T) may discriminate between domains with weak and strong initial fabrics and may thus be used to map out domains with different strain histories and perhaps also with different melt proportions and rheological behaviour within metamorphic domes.

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“…The individual melasyenite to melagranite porphyries (U-Pb zircon age 337.87 ± 0.21 Ma; Kubínová et al 2017) are oriented W-E to WNW-ESE and are nearly vertical or steeply dipping southwards (Fig. 3b).…”

Section: Central Bohemian Dyke Swarmmentioning

confidence: 99%

Magnetic fabric and emplacement of dykes of lamprophyres and related rocks of the Central Bohemian Dyke Swarm (Central European Variscides)

Hrouda¹,

Verner²,

Kubínová³

et al. 2016

Jour. Geosci.

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Numerous dykes of lamprophyres and various types of granitoid, syenitoid, dioritoid, and gabbroid porphyries of Variscan age crop out in the area of the Central Bohemian Plutonic Complex and adjacent high-to low-grade metamorphic units of the Moldanubian Zone and Teplá-Barrandian Unit. Magnetic fabric in fourteen dykes of lamprophyres and related rocks was investigated. Mostly, the magnetic foliation is roughly parallel to the dyke plane and the magnetic lineation is horizontal with the relics of originally steep fabrics. This type of magnetic fabric originated through magma flow in which the larger surfaces of the magnetic minerals were oriented parallel to the dyke plane and their longer dimensions were parallel to the magma flow. In two localities, the so-called inverse fabrics were found in which the maximum and minimum susceptibility directions were swapped. The dykes of lamprophyres and related rocks were emplaced into already juxtaposed and cooled Teplá-Barrandian Zone, Central Bohemian Plutonic Complex and western Moldanubian Zone not later than 339 Ma. Parallel orientation of dykes giving a steep intrusive contacts mainly in W(NW)-E(SE) trend was caused by the regional stress field of ~WNW-ESE convergence (arc-parallel stretching) during the Variscan Orogeny.

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Ultrapotassic dykes in the Moldanubian Zone and their significance for understanding of the post-collisional mantle dynamics during Variscan orogeny in the Bohemian Massif

Cited by 34 publications

References 86 publications

Exhuming a cold case: The early granodiorites of the northwest Iberian Variscan belt—A Visean magmatic flare-up?

Exhuming a cold case: The early granodiorites of the northwest Iberian Variscan belt—A Visean magmatic flare-up?

Complex mid‐crustal flow within a growing granite–migmatite dome: An example from the Variscan belt illustrated by the anisotropy of magnetic susceptibility and fabric modelling

Magnetic fabric and emplacement of dykes of lamprophyres and related rocks of the Central Bohemian Dyke Swarm (Central European Variscides)

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