Deciphering the relationships between streamlined subglacial landforms and deposits therein helps to constrain the dynamics of past ice sheets. Here we present microstructural analyses of till from the largest drumlin field in the North European Lowland generated by a major palaeo‐ice stream of the Scandinavian Ice Sheet. Data derived from thin sections and X‐ray microtomography (μCT) reveal multiple microstructures including microshears, circular structures, grain stacks and crushed grains. Long axes of micro‐clasts measured in thin sections are directionally clustered and have low, down‐ice‐oriented dip angles. Some samples reveal subordinate clustering oriented at high angles to the main direction. The μCT data show low clustering strengths of clasts and no systematic fabric pattern in the entire set of samples. There is no correspondence between the clast orientations and the directions of drumlin long axes, suggesting that the till is antecedent in relation to the drumlin‐shaping process. The observations indicate spatially and temporally variable, shallow‐seated brittle and ductile deformation controlled by porewater pressure fluctuations and generated time‐transgressively parallel to till accretion. Consistently with previous studies, the data suggest that the Stargard drumlins are erosional remnants of a pre‐existing terrain shaped by material removal from the inter‐drumlin areas.

中文翻译：

---

受微观结构代理约束，波兰西北部斯塔加德·德林（Stargard drumlin）田间的运动学

解密流线型冰川下的地貌与其中的沉积物之间的关系有助于限制过去冰盖的动力学。在这里，我们介绍了北欧低地最大的鼓林场直到斯堪的纳维亚冰原的主要古冰流产生的耕till的微观结构分析。薄切片和X射线断层扫描（μCT）得出的数据显示出多种微观结构，包括微剪切，圆形结构，晶粒堆积和压碎的晶粒。在薄片中测量的微碎屑的长轴是方向性聚集的，并且具有较低的向下冰倾角。一些样本揭示了与主方向成高角度定向的从属聚类。μCT数据显示出碎屑的聚类强度低，并且在整个样本集中没有系统的织物图案。劈裂方向与鼓林长轴方向之间没有对应关系，这表明，相对于鼓林成形过程而言，前缘是先行的。观测结果表明，时空变化，浅层脆性和韧性变形受到孔隙水压力波动的控制，并在时间上平行于吸积物产生。与以前的研究一致，数据表明，斯塔加德鼓林是先前存在的地形的侵蚀性残余物，地形是通过从鼓林间区域去除物质而形成的。浅层脆性和韧性变形受孔隙水压力波动的控制，并在时间上平行于积层生成。与以前的研究一致，数据表明，斯塔加德鼓林是先前存在的地形的侵蚀性残余物，地形是通过从鼓林间区域去除物质而形成的。浅层脆性和韧性变形受孔隙水压力波动的控制，并在时间上平行于积层生成。与以前的研究一致，这些数据表明，斯塔加德鼓林是鼓膜间区域材料清除后形成的原有地形的侵蚀残余物。