Transformation of a magmatic arc and an orogenic root during oblique collision and it’s consequences for the evolution of the European Variscides (Mid-German Crystalline Rise)

Abstract

The architecture of the European

Gondwana-derived microcontinents — the constituents of the Variscan and Alpine collisional orogens

“…minerals, a historical observation made for the Alpine cross-section by Voll (1976). Again, reconstructions of the Variscan orogenic belt Matte, 1986;Oncken, 1997) illustrate its complex tectonic evolution and juxtaposition of pre-Variscan elements. Deformation similar to the Alpine imbrication of pre-Mesozoic basement had already affected the Pre-Variscan domains before and during the Late Variscan orogenic phase resulting in superposed structures (e.g.…”

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

“…Bard 1997;Oncken 1997) and Alpine events one in front of the other to produce the present-day juxtaposition. During their large-scale accretion and strike-slip transport, many of these basement areas left behind their lithospheric roots.…”

Palaeozoic amalgamation of Central Europe: an introduction and synthesis of new results from recent geological and geophysical investigations

“…Franke 2000), which are spatially related to this suture, appear to mark the closure of an early Devonian successor basin, the Lizard-Giessen-Harz 'ocean', which apparently developed on the south side of the Rheic Ocean, and was, on collision, overthrust to the north, so that the ophiolitic fragments resulting from the obduction of this successor basin are now situated within the Giessen-Werra-Stidharz/ Selke Nappe, north of the Rheic Suture. The Mid-German Crystalline High (MGCH) marks the position of both, below the Rheic Suture late Silurian-Devonian arc magmatism on the Avalonian margin, and, now spatially superimposed upon it, but above the south-dipping Rheic Suture, Carboniferous age volcanism (Oncken 1997). Small magnetic highs seem to indicate a continuation of the volcanic centres within the MGCH eastwards into Poland as far as a point just NE of the Leszno-Wolsztyn High, corresponding to the location of the Moravian Line.…”