Back to sender: tectonic accretion and recycling of Baltica-derived Devonian clastic sediments in the Rheno-Hercynian Variscides

Franke, Wolfgang; Dulce, Joachim-Christian

doi:10.1007/s00531-016-1408-y

Cited by 38 publications

(17 citation statements)

References 38 publications

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“…2), which includes the SW England study area, occurred in a marginal basin north of the Rheic Ocean or in a successor Rhenohercynian Ocean following its latest Silurian-earliest Devonian closure (e.g. Franke 2000;Shail & Leveridge 2009;Eckelmann et al 2014;Von Raumer et al 2016;Arenas et al 2016;Franke & Dulce 2017;. Distinct expressions of the Rheic and Rhenohercynian sutures have been inferred, in the Spessart Mountains (Germany), but the two sutures are generally shown as coincident and described as the Rheic-Rhenohercynian suture zone (Franke 2000;Franke & Dulce 2017;.…”

Section: The Rheic-rhenohercynian Suture Zonementioning

confidence: 99%

“…Franke 2000;Shail & Leveridge 2009;Eckelmann et al 2014;Von Raumer et al 2016;Arenas et al 2016;Franke & Dulce 2017;. Distinct expressions of the Rheic and Rhenohercynian sutures have been inferred, in the Spessart Mountains (Germany), but the two sutures are generally shown as coincident and described as the Rheic-Rhenohercynian suture zone (Franke 2000;Franke & Dulce 2017;. In the following sections, we refer to "lower plate" and "upper plate" with respect to the SE-dipping late Devonian-early Carboniferous Rhenohercynian suture zone that is imaged cutting the whole crust on reflection seismic profiles immediately south of SW England (Leveridge et al 1984;BIRPS & ECORS 1986;).…”

Section: The Rheic-rhenohercynian Suture Zonementioning

confidence: 99%

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Late Paleozoic extensional reactivation of the Rheic–Rhenohercynian suture zone in SW England, the English Channel and Western Approaches

Alexander¹,

Shail

Leveridge³

2019

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The Rheic Ocean is a persistent feature of Paleozoic palaeogeographies whose closure contributed to the development of the Variscan orogen and formation of Pangaea. Geological and geophysical data indicate repeated episodes of Paleozoic rifting and plate convergence around SW England and the adjacent offshore areas. SW England occupied a lower plate position during the Devonian-Carboniferous, on the northern passive margin of the short-lived Rhenohercynian Ocean that had formed near a recently closed segment of the Rheic Ocean. Variscan plate convergence resulted in the development of the composite southwardsdipping Rheic-Rhenohercynian suture zone by the latest Devonian and inversion of the lower plate basins during the Carboniferous. Early Permian NNW-SSE extensional reactivation of this suture zone controlled the development of the Western Approaches Basins in its hangingwall and provides an excellent example of Wilson Cycle structural inheritance. The onshore expression of this episode includes shear zones and detachment faults consistent with top-to-the SSE extensional reactivation of Variscan thrust faults. There is a progression to higher-angle brittle extensional faults that cutout earlier structures. Exhumation of the lower plate was accompanied by Early Permian mantle and concomitant crustal partial melting, the construction of the Cornubian Batholith, and W-Sn-Cu fracture-hosted mineralisation.

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Section: The Rheic-rhenohercynian Suture Zonementioning

confidence: 99%

Section: The Rheic-rhenohercynian Suture Zonementioning

confidence: 99%

Late Paleozoic extensional reactivation of the Rheic–Rhenohercynian suture zone in SW England, the English Channel and Western Approaches

Alexander¹,

Shail

Leveridge³

2019

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“…1a) are not necessarily wrong. Both the southern domains of the Ossa-Morena Zone (the Aracenas belt) and the Mid-German Crystalline High may have had Armoricantype basement that was simply eroded in the latter (Franke and Dulce 2017). Moreover, the quartzites with Mesoproterozoic detrital zircon grains (underplated, northerly derived shelf sediments) and Ordovician/Silurian orthogneisses may well be hidden at depth in south-western Portugal.…”

Section: Transregional Correlations For the Variscan Tectonic Unitsmentioning

confidence: 99%

“…Furthermore, the early Neoproterozoic sedimentary rocks of Avalonian affinity have not yet been identified in NW Europe. At the end of Devonian, the Neoproterozoic Avalonian basement in the latter area was buried underneath Palaeozoic sediments (Franke and Dulce 2017;, and it was not available as a source of detritus even if an early Neoproterozoic succession was somewhere hidden in the Variscan northern foreland. Of course, it is still possible that detritus of Famennian clastic rocks under the northern Rhenish Massif was supplied from a remote source in Nova Scotia, but, using Occam's razor, it is more realistic to assume their derivation from nearby Baltica (Kołtonik et al 2018).…”

Section: Detrital Zircon Signature Of Avaloniamentioning

confidence: 99%

Reply to Comment by M.F. Pereira, J.B. Silva and C. Gama on “Baltic provenance of top-Famennian siliciclastic material of the northern Rhenish Massif, Rhenohercynian zone of the Variscan orogen, by Koltonik et al., International Journal of Earth Sciences (2018) 107:2645–2669”

Kołtonik

Pisarzowska

Paszkowski

et al. 2019

Int J Earth Sci (Geol Rundsch)

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“…620, 1350 Ma, two grains with 1490, 1800 Ma) and not Gondwana, which should not contain inherited ages between 1000 and 2000 Ma (e.g. Breitkreuz et al 2007;Pietranik et al 2013a;Żelaźniewicz et al 2016;Franke and Dulce 2017). Therefore, a mixture of sediments derived from several crustal blocks is favoured as the source of Pniewy and Chrzypsko rhyolites, with Variscan foreland sediments being the dominating source.…”

Section: Inherited and Magmatic Zircon Ages: Insight Into Potential Mmentioning

confidence: 99%

Contrasting sources of Late Paleozoic rhyolite magma in the Polish Lowlands: evidence from U–Pb ages and Hf and O isotope composition in zircon

Słodczyk

Pietranik

Glynn

et al. 2018

Int J Earth Sci (Geol Rundsch)

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The Polish Lowlands, located southwest of the Teisseyre-Tornquist Zone, within Trans-European Suture Zone, were affected by bimodal, but dominantly rhyolitic, magmatism during the Late Paleozoic. Thanks to the inherited zircon they contain, these rhyolitic rocks provide a direct source of information about the pre-Permian rocks underlying the Polish Lowland. This paper presents zircon U-Pb geochronology and Hf and O isotopic results from five drill core samples representing four rhyolites and one granite. Based on the ratio of inherited vs. autocrystic zircon, the rhyolites can be divided into two groups: northern rhyolites, where autocrystic zircon is more abundant and southern rhyolites, where inherited zircon dominates. We suggest that the magma sources and the processes responsible for generating high silica magmas differ between the northern and southern rhyolites. Isotopically distinct sources were available during formation of northern rhyolites, as the Hf and O isotopes in magmatic zircon differ between the two analysed localities of northern rhyolites. A mixing between magmas formed from Baltica-derived mudstone-siltstone sediments and Avalonian basement or mantle can explain the diversity between the zircon compositions from the northern localities Daszewo and Wysoka Kamieńska. Conversely, the southern rhyolites from our two localities contain zircon with similar compositions, and these units can be further correlated with results from the North East German Basin, suggesting uniform source rocks over this larger region. Based on the ages of inherited zircon and the isotopic composition of magmatic ones, we suggest that the dominant source of the southern rhyolites is Variscan foreland sediments mixed with Baltica/Avalonia-derived sediments.

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Back to sender: tectonic accretion and recycling of Baltica-derived Devonian clastic sediments in the Rheno-Hercynian Variscides

Cited by 38 publications

References 38 publications

Late Paleozoic extensional reactivation of the Rheic–Rhenohercynian suture zone in SW England, the English Channel and Western Approaches

Late Paleozoic extensional reactivation of the Rheic–Rhenohercynian suture zone in SW England, the English Channel and Western Approaches

Reply to Comment by M.F. Pereira, J.B. Silva and C. Gama on “Baltic provenance of top-Famennian siliciclastic material of the northern Rhenish Massif, Rhenohercynian zone of the Variscan orogen, by Koltonik et al., International Journal of Earth Sciences (2018) 107:2645–2669”

Contrasting sources of Late Paleozoic rhyolite magma in the Polish Lowlands: evidence from U–Pb ages and Hf and O isotope composition in zircon

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