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.

东南奥利卡-涅涅尼克圆顶（NE Bohemian Massif）的高压花岗直生片岩显示出浅倾叶状的遗迹，经直立褶皱和大部分呈N-S趋势的垂直轴下平面状叶状返修。基于宏观观察，区分出从条带状到schlieren状和星云状片麻状的逐渐过渡。所有岩石类型包括斜长石，钾长石，石英，白云母，黑云母和石榴石。该转变的特征在于沿类似晶粒边界的间隙相的存在增加，并且通过细粒黑硅藻土逐渐替代重结晶的钾长石晶粒。这些纹理变化是同变形晶粒熔体渗流的特征，这与观察到的岩石在不相容元素（如REEs，Ba，Sr和K暗示了熔体穿过岩石的开放系统行为。的从热力学模型推导出的P – T路径表明减压从〜15-16 kbar和〜650–740ºC降到〜6 kbar和〜640ºC。熔体已经存在于对叔峰条件由斜长石在膜，间质颗粒和在所述myrmekite组合物albitic所指示。可变重新平衡的石榴石表明，熔体含量可能沿着减压路径变化，依次涉及熔体的增加和减少。垂直叶面和辉石岩纹理梯度的约6-8 km宽带被解释为垂直地壳尺度的通道，其中颗粒尺度的熔体渗流与部分熔融的地壳楔块的水平缩短和垂直流动有关。