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Geological Society, London, Special Publications; 2000; v. 179; p. 355-368;
DOI: 10.1144/GSL.SP.2000.179.01.21
© 2000 Geological Society of London

Foreland-directed lower-crustal flow and its implications for the exhumation of high-pressure-high-temperature rocks

Andreas Henk

Institut für Geologie, Universität Würzburg, Pleicherwall 1, D-97070 Würzburg, Germany a.henk{at}mail.uni-wuerzburg.de

Thermo-mechanical finite element models are used to study foreland-directed lower-crustal flow as a potential process to transport high-pressure-high-temperature (HP-HT) rocks from a continental collision zone to areas that have never experienced crustal thickening or deep burial. The numerical simulations show that lower-crustal rocks can indeed flow over substantial horizontal and vertical distances, provided a thermal anomaly reducing lithospheric strength exists in the foreland. As lower-crustal flow is a fast process compared with conductive heat transport and occurs subparallel to the isotherms, the resulting PT path of the rocks exhumed will be characterized by near-isothermal decompression. Modelling results are applied to the Saxonian Granulite Massif in Eastern Germany, where HP-HT granulites have been exhumed beneath a marine sedimentary basin during the Variscan Orogeny.





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