The high- to ultrahigh-pressure ((U)HP) metamorphic rocks are present within the European Variscan belt between the Bohemian and Iberian massifs (the Galicia-Moldanubian zone) and they are partly incorporated into the Alpine orogenic system. Due to their involvement in various allochthonous units, the affiliation of the (U)HP rocks to the suture zones that were the sites of their initial exhumation, is not always clear. The Bohemian Massif preserves the best evidence of Variscan sutures with clear relationships to the exposed (U)HP rocks. They are the Moldanubian and the Saxo-Thuringian sutures bounding the Teplá-Barrandian block from the SSE and NNE, respectively. The distribution of (U)HP rocks coincides with the boundaries of mantle lithosphere domains, delimited from large-scale seismic anisotropy, and reveals the NW-ward inclination of the Moldanubian mantle lithosphere domain beneath the Teplá-Barrandian block and thus a subduction polarity to the NW. The eastern margin of the Teplá-Barrandian block contains a magmatic arc, which is in direct contact with the Moldanubian orogenic wedge, and both are penetrated by lamprophyre dykes (∼340 Ma), which dates the cessation of the collision-related shortening and crustal consolidation. The overall crustal geometry of the Saxo-Thuringian suture implies the SE-ward polarity of subduction during its formation. However, based on seismic tomography and anisotropy model, the suture at mantle depths appears as a sub-vertical boundary between the Saxo-Thuringian and the Teplá-Barrandian lithosphere domains. The Saxo-Thuringian zone bears evidence of blueschist facies metamorphism in the (para)autochthonous units, which are strongly retrogressed. Compared to the Moldanubian zone, (U)HP rocks are less common in the Saxo-Thuringian zone and occur as nappes and klippes, some of which are exposed near the Moldanubian suture. The similarities of the Saxo-Thuringian (U)HP rocks to those in the Moldanubian zone and their allochthonous positions favour formation of some of the (U)HP rocks along the Moldanubian suture and their subsequent emplacement into the Saxothuringian zone. The Moldanubian suture appears to control the distribution of most of the (U)HP rocks exposed along the European Variscan Belt. They all show similarities regarding lithology, mainly fragments of mantle rocks included in felsic materials, and their granulite-amphibolite facies thermal overprint.

中文翻译：

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基于波西米亚地块的岩石学和地震学数据的 Variscan 缝合线的位置和极性以及对欧洲 Variscides 的影响

高压至超高压（(U)HP）变质岩存在于波西米亚和伊比利亚地块（加利西亚-莫尔达努比亚带）之间的欧洲瓦里坎带内，并且它们部分并入阿尔卑斯造山系统。由于它们涉及各种异地单位，(U)HP 岩石与其最初挖掘地点的缝合带的隶属关系并不总是明确的。波希米亚地块保留了瓦里斯坎缝合线的最佳证据，与暴露的 (U)HP 岩石有明确的关系。它们是分别从 SSE 和 NNE 界定 Teplá-Barrandian 地块的摩尔达努比亚缝合线和萨克斯-图林根缝合线。(U)HP岩石的分布与地幔岩石圈域的边界一致，由大尺度地震各向异性界定，并揭示了Teplá-Barrandian地块下方的摩尔达努比亚地幔岩石圈域向西北方向倾斜，从而揭示了俯冲极性西北。Teplá-Barrandian 地块的东缘包含一个岩浆弧，该岩浆弧与摩尔达努比亚造山楔直接接触，并且两者都被煌斑岩脉（∼340 Ma）穿透，这确定了与碰撞有关的缩短和地壳的停止的时间。合并。萨克斯-图林根缝合线的整体地壳几何形状暗示了其形成过程中俯冲的东南向极性。然而，根据地震层析成像和各向异性模型，地幔深处的缝合线表现为萨克斯-图林根和特普拉-巴兰迪亚岩石圈域之间的亚垂直边界。萨克斯-图林根带在（准）原地单元中具有蓝片岩相变质作用的证据，这些变质作用强烈退化。与摩尔达努比亚地带相比，(U)HP 岩石在萨克索-图林根地带较少见，以推覆体和飞峰形式出现，其中一些岩石暴露在摩尔达努比亚缝合线附近。萨克斯-图林根 (U)HP 岩石与摩尔达努比亚地区岩石的相似性及其异地位置有利于沿摩尔达努比亚缝合线形成一些 (U)HP 岩石，并随后侵位到萨克斯图林根地区。摩尔达努比亚缝合线似乎控制了沿欧洲瓦里斯坎带暴露的大部分 (U)HP 岩石的分布。它们在岩性方面都表现出相似性，主要是长英质物质中所含的地幔岩石碎片，及其麻粒岩-角闪岩相热叠印。