An earlier concept of the Variscan foreland in Poland (Narkiewicz, 2007) is reconsidered in the light of new stratigraphic, tectonic and geophysical evidence, providing new data on Devonian sedimentation, Carboniferous magmatism and the deep crustal structure of SE Poland. Regional comparisons with the tectonic evolution of Central Europe and the Black Sea region show that the subsidence pattern in the foreland was controlled by alternating phases of accelerated convergence and tectonic standstill along the southern margin of Euramerica. In particular, the Bretonian (Devonian/Carboniferous) compressional deformation resulted from intensified orogenic convergence in the West-Central uropean Variscides leading to closure of the Saxo-Thuringian Basin and East-Sudetic back-arc basin. Another turning point in the regional tectonosedimentary development around the Mississippian–Pennsylvanian boundary was probably related to the termination of terrane collision in the Black Sea region. Late Pennsylvanian basin inversion was associated with a roughly N–S tectonic shortening. This was partly due to displacement along pre-existing basement discontinuities comprising reactivated Caledonian sutures that also pre-determined the Devonian–Carboniferous basin boundaries. Consequently, deeply-rooted tectonic zones, including the Krakow-Lubliniec and Holy Cross faults and the Teisseyre-Tornquist Zone, focussed maximum compressional and transpressional deformation and associated uplift. Such a concept of terminal Variscan tectonism, termed here the “decoupled model”, is discussed with reference to the recently proposed “coupled model”. The latter assumes a wide extent of the Variscan Orogen, reaching as far as the marginal Radom–Kraśnik Fold-and-Thrust Belt linked with the Bohemian Massif through a major basal detachment. It is concluded that the “decoupled model” is more consistent with the documented seismic and structural evidence as well as with the present knowledge of the heterogeneous pre-Devonian basement in southern Poland.

中文翻译：

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重新审视波兰的 Variscan 前陆：新数据和新概念

根据新的地层、构造和地球物理证据，重新考虑了波兰 Variscan 前陆的早期概念（Narkiewicz，2007），提供有关泥盆纪沉积、石炭纪岩浆作用和波兰东南部深部地壳结构的新数据。与中欧和黑海地区构造演化的区域比较表明，前陆的沉降模式受欧美洲南缘加速辐合和构造停滞的交替阶段控制。特别是，巴托尼亚（泥盆纪/石炭纪）挤压变形是由中西部欧洲瓦里西德斯的强化造山辐合导致的，导致萨克森-图林根盆地和东-苏德台弧后盆地关闭。密西西比-宾夕法尼亚边界附近区域构造沉积发育的另一个转折点可能与黑海地区地体碰撞的终止有关。宾夕法尼亚盆地晚期反转与大致 N-S 构造缩短有关。这部分是由于沿预先存在的基底不连续性的位移，包括重新激活的加里东缝合线，这些缝合线也预先确定了泥盆纪-石炭纪盆地边界。因此，根深蒂固的构造带，包括 Krakow-Lubliniec 和圣十字断层以及 Teisseyre-Tornquist 带，集中了最大的挤压和挤压变形以及相关的隆起。参考最近提出的“耦合模型”讨论了这种终端瓦利斯坎构造的概念，这里称为“解耦模型”。后者假设了 Variscan 造山带的广阔范围，到达边缘 Radom-Kraśnik 褶皱冲断带，通过一个主要的基底分离与波西米亚地块相连。得出的结论是，“解耦模型”与记录在案的地震和结构证据以及波兰南部非均质前泥盆纪基底的现有知识更一致。