@article{183,
  author = {Carmen Aguilar and Pavla {\v S}t{\'\i}psk{\'a} and Francis Chopin and Karel Schulmann and Pavel Pitra and Prokop Z{\'a}vada and Pavl{\'\i}na Hasalov{\'a} and Jean-Emmanuel Martelat},
  title = {Syn-deformational melt percolation through a high-pressure orthogneiss and the exhumation of a subducted continental wedge (Orlica-{\'S}nie{\.z}nik Dome, NE Bohemian Massif)},
  abstract = {High-pressure granitic orthogneiss of the south-eastern Orlica{\textendash}{\'S}nie{\.z}nik Dome (NE Bohemian Massif) shows relics of a shallow-dipping foliation, reworked by upright folds and a mostly pervasive N{\textendash}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{\textendash}T path deduced from the thermodynamic modelling indicates decompression from ~ 15-16 kbar and ~ 650{\textendash}740 {\textordmasculine}C to ~ 6 kbar and ~ 640 {\textordmasculine}C. Melt was already present at the P{\textendash}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{\textendash}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.},
  year = {2020},
  booktitle = {International Journal of Earth Sciences},
  journal = {International Journal of Earth Sciences},
  series = {International Journal of Earth Sciences},
  volume = {109},
  chapter = {1213},
  pages = {34},
  institution = {Springer Berlin Heidelberg},
  organization = {Springer Berlin Heidelberg},
  publisher = {Springer Berlin Heidelberg},
  school = {Springer Berlin Heidelberg},
  doi = {https://doi.org/10.1007/s00531-020-01838-4},
}