Syn-convergent high-temperature metamorphism and magmatism in the Variscides: a discussion of potential heat sources
Published:January 01, 2000
A. Henk, F. Von Blanckenburg, F. Finger, U. Schaltegger, G. Zulauf, 2000. "Syn-convergent high-temperature metamorphism and magmatism in the Variscides: a discussion of potential heat sources", Orogenic Processes: Quantification and Modelling in the Variscan Belt, Wolfgang Franke, Volker Haak, Onno Oncken, David Tanner
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A period of pervasive high-temperature metamorphism and igneous activity from 340 to 325 Ma is a well-established characteristic of the Variscan Orogen of Central Europe. During this stage, the internal zone of the orogen was virtually soaked by granitic to granodioritic magmas. Petrological data point to temperatures of 600–850°C at upper- to mid-crustal levels. These elevated temperatures occurred during the final convergence stage and may be comparable with similar processes inferred from geophysical evidence for the present-day Tibetan Plateau, in both regional extent and significance for the orogen's evolution. We review various geodynamic scenarios that may have provided the...
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Orogenic Processes: Quantification and Modelling in the Variscan Belt
Research into the orogenic processes that shaped the continental crust of Europe has a long-standing tradition. Why the need to quantify and model? It is not just satisfactory to identify subduction zones, accretionary prisms, island arcs, extensional collapse and other standard items of the geodynamic menu. Such interpretations need to be quantified: extent and composition of subducted crust, angle and speed of subduction, amount and composition olmelts produced, heat sources for metamorphism. All such interpretations have to conform to first principles, and also to stand the test of quantitative balancing – a concept first developed for the conservation of length or volume in tectonic cross sections. Also in other fields, the correlation of causes and effects and the internal consistency of dynamic models requires a numerical approach.
The present volume combines review articles with reports on recent progress in an attempt to address these aims. There is a foldout map of the region, which locates the main areas of outcrop and tectono-stratigraphic units, and a reassesment of the Palaeozoic time scale permits correlation of tectonic, metamorphic and magmatic events with the sedimentary record of the upper crust.