Organization of pre-Variscan basement areas at the north-Gondwanan margin

Abstract

Pre-Variscan basement elements of Central Europe appear in polymetamorphic domains juxtaposed through Variscan and/or Alpine tectonic events.

Silurian high-pressure granulites from Central Qiangtang, Tibet: Constraints on early Paleozoic collision along the northeastern margin of Gondwana

“…10d) Von Raumer et al, 2002;Ferrari et al, 2008;Lehmann et al, 2013;Metcalfe, 2011bMetcalfe, , 2013. The "Asiatic Hunic superterrane" might have been an assemblage of continental blocks or volcanic islands including Tarim-Qaidam, North and South China Von Raumer et al, 2002;Metcalfe, 2011bMetcalfe, , 2013. The opening of the Paleo-Tethyan Ocean also led to the arrest and dismemberment of the early Paleozoic orogenesis along the northern margin of Indo-Australian Gondwana.…”

“…Robust paleomagnetic, biogeographical, and tectonostratigraphic data indicate that the PaleoTethyan Ocean initially opened as a back-arc basin during the Middle Silurian to Early Devonian in response to the detachment of the ribbon-like "Asiatic Hunic superterrane" from the northern margin of Gondwana (Fig. 10d) Von Raumer et al, 2002;Ferrari et al, 2008;Lehmann et al, 2013;Metcalfe, 2011bMetcalfe, , 2013. The "Asiatic Hunic superterrane" might have been an assemblage of continental blocks or volcanic islands including Tarim-Qaidam, North and South China Von Raumer et al, 2002;Metcalfe, 2011bMetcalfe, , 2013.…”

SHRIMP dating of zircons from high-grade metasediments of the Schwarzwald/SW-Germany and implications for the evolution of the Moldanubian basement

“…Within this context, the Schwarzwald and the Vosges in the southwestern part of the Moldanubian zone are of particular interest. Geographically, they are located between the Armorican Massif, classically considered to represent the terrane Armorica, and the Moldanubian zone of the Bohemian Massif, seen as a more easterly part of the European Hunic terrane by several authors von Raumer et al 2002). Lithologically, apart from granites, the Schwarzwald and Vosges are dominated by high-grade metamorphic gneisses and migmatites.…”

“…The latter are generally seen as derived from the northern margin of Gondwana (e.g. Franke 2000;von Raumer et al 2002) during Palaeozoic rifting events. From the Neoproterozoic to the Ordovician, they are viewed as an EW-trending belt comprising from west to east Avalonia, the Amorican terrane assemblage (ATA) and the Cadomian terranes, the future Alpine realm, and parts of future Asia (e.g.…”

“…In the Variscan fold belt detritus ages have been successfully used to detect ancient terranes and to reconstruct the geodynamic and geotectonic evolution of Europe during the Palaeozoic (e.g. Franke 2000;Hegner and Kro¨ner 2000;Linnemann et al 2000;So¨llner et al 1997;Tichomirova et al 2001;von Raumer et al 2002von Raumer et al , 2003. The contribution of detrital zircon dating is most important in the understanding of the internal parts of orogens where complex internal nappe structures and high-grade metamorphism often impede the application of palaeomagnetic, stratigraphic and palaeontological methods.…”