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Syn-deformational melt percolation through a high-pressure orthogneiss and the exhumation of a subducted continental wedge (Orlica-Śnieżnik Dome, NE Bohemian Massif)

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Abstract

High-pressure granitic orthogneiss of the south-eastern Orlica–Śnieżnik Dome (NE Bohemian Massif) shows relics of a shallow-dipping foliation, reworked by upright folds and a mostly pervasive N–S trending subvertical axial planar foliation. Based on macroscopic observations, a gradual transition from banded to schlieren and nebulitic orthogneiss was distinguished. All rock types comprise plagioclase, K-feldspar, quartz, white mica, biotite and garnet. The transition is characterized by increasing presence of interstitial phases along like-like grain boundaries and by progressive replacement of recrystallized K-feldspar grains by fine-grained myrmekite. These textural changes are characteristic for syn-deformational grain-scale melt percolation, which is in line with the observed enrichment of the rocks in incompatible elements such as REEs, Ba, Sr and K suggesting open-system behaviour with melt passing through the rocks. The P–T path deduced from the thermodynamic modelling indicates decompression from ~ 15−16 kbar and ~ 650–740 ºC to ~ 6 kbar and ~ 640 ºC. Melt was already present at the P–T peak conditions as indicated by the albitic composition of plagioclase in films, interstitial grains and in myrmekite. The variably re-equilibrated garnet suggests that melt content may have varied along the decompression path, involving successively both melt gain and loss. The ~ 6–8 km wide zone of vertical foliation and migmatite textural gradients is interpreted as vertical crustal-scale channel where the grain-scale melt percolation was associated with horizontal shortening and vertical flow of partially molten crustal wedge en masse.

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Acknowledgements

This work was financially supported by the Czech national grant agency (GAČR 16-17457s and 19-25035s to P. Štípská). We would like to thank E. Oliot from Montpellier University for his useful discussions about fluids-rocks interactions during the course of this work. We are also grateful to M. Racek from Charles University for operating the SEM and EPMA. Detailed constructive comments provided by J. Szczepański and R. Weinberg, editor in chief Wolf-Christian Dullo and guest editor P. Jeřábek are greatly appreciated.

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Authors and Affiliations

  1. Centre for Lithospheric Research, Czech Geological Survey, Klárov 3, 11821, Prague, Czech Republic

    Carmen Aguilar, Pavla Štípská, Francis Chopin, Karel Schulmann, Pavel Pitra & Pavlína Hasalová

  2. Université de Strasbourg, CNRS, IPGR UMR 7516, 67000, Strasbourg, France

    Pavla Štípská, Francis Chopin & Karel Schulmann

  3. Univ Rennes, CNRS, Géosciences Rennes, UMR 6118, 35000, Rennes, France

    Pavel Pitra

  4. Institute of Geophysics, Academy of Sciences, Boční II/1401, 14131, Prague, Czech Republic

    Prokop Závada

  5. Laboratoire de Géologie de Lyon–CNRS UMR5276, Université Claude Bernard et École Normale Supérieure, 69622, Villeurbanne, France

    Jean-Emmanuel Martelat

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  1. Carmen Aguilar
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  2. Pavla Štípská
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  3. Francis Chopin
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  5. Pavel Pitra
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  7. Pavlína Hasalová
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  8. Jean-Emmanuel Martelat
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Correspondence to Carmen Aguilar.

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Aguilar, C., Štípská, P., Chopin, F. et al. Syn-deformational melt percolation through a high-pressure orthogneiss and the exhumation of a subducted continental wedge (Orlica-Śnieżnik Dome, NE Bohemian Massif). Int J Earth Sci (Geol Rundsch) 109, 1213–1246 (2020). https://doi.org/10.1007/s00531-020-01838-4

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