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Rapid extensional unroofing of a granite–migmatite dome with relics of high-pressure rocks, the Podolsko complex, Bohemian Massif

Published online by Cambridge University Press:  11 February 2016

JIŘÍ ŽÁK ,
JIŘÍ SLÁMA  and
MIROSLAV BURJAK
JIŘÍ ŽÁK*
Affiliation:
Institute of Geology and Paleontology, Faculty of Science, Charles University, Albertov 6, Prague, 12843, Czech Republic
JIŘÍ SLÁMA
Affiliation:
Institute of Geology, Czech Academy of Sciences, Rozvojová 269, Prague, 16500, Czech Republic
MIROSLAV BURJAK
Affiliation:
Institute of Geology and Paleontology, Faculty of Science, Charles University, Albertov 6, Prague, 12843, Czech Republic Geotest, PLC, Olšanská 3, Prague, 13000, Czech Republic
*
†Author for correspondence: jirizak@natur.cuni.cz
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Abstract

The Podolsko complex, Bohemian Massif, is a high-grade dome that is exposed along the suprastructure–infrastructure boundary of the Variscan orogen and records snapshots of its protracted evolution. The dome is cored by leucocratic migmatites and anatectic granites that enclose relics of high- to ultrahigh-pressure rocks and is mantled by biotite migmatites and paragneisses whose degree of anatexis decreases outwards. Our new U–Pb zircon ages indicate that the leucocratic migmatites were derived from Early Ordovician (c. 480 Ma) felsic igneous crust; the same age is inferred for melting the proto-source of the metapelitic migmatites. The relics of high- to ultrahigh-pressure rocks suggest that at least some portions of the complex witnessed an early Variscan subduction to mantle depths, followed by high-temperature anatexis and syntectonic growth of the Podolsko dome in the middle crust at c. 340–339 Ma. Subsequently, the dome exhumation was accommodated by crustal-scale extensional detachments. Similar c. 340 Ma ages have also been reported from other segments of the Variscan belt, yet the significance of this tectonothermal event remains uncertain. Here we conclude that the 340 Ma age post-dates the high-pressure metamorphism; the high temperatures required to cause the observed isotopic resetting and new growth of zircon were probably caused by heat input from the underlying mantle and, finally, the extensional unroofing of the complex requires a minimum throw of about 8–10 km. We use this as an argument for significant early Carboniferous palaeotopography in the interior of the Variscan orogen.

Keywords

anisotropy of magnetic susceptibility (AMS)granite–migmatite domeexhumationmetamorphic core complexU–Pb zircon geochronology
Type
Original Articles
Information
Geological Magazine , Volume 154 , Issue 2 , March 2017 , pp. 354 - 380
Copyright
Copyright © Cambridge University Press 2016 

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