Geological Quarterly ( IF 1 ) Pub Date : 2021-07-12 , DOI: 1589 Aleksandra Stachowska, Piotr Krzywiec
Interpretation of the regional high-resolution seismic data of the PolandSPANTM survey in the Grudziądz-Polik area revealed a new depositional architecture of the Upper Cretaceous succession that differs substantially from the previously assumed layer-cake model, commonly applied to Permian-Mesozoic sequences. A previously unrecognized regional unconformity, dividing the Upper Cretaceous succession into two units characterized by very different internal geometries, was identified and mapped. The lower unit, with a generally layer-cake internal pattern, is overlain by an upper unit composed of a regionally low-angle succession that pinches out toward the south. This newly revealed regional pattern remained unrecognized in previous regional compilations based on borehole data, which suggested that a layer-cake depositional architecture prevailed throughout the entire Upper Cretaceous. This new image of Upper Cretaceous depositional patterns has far-reaching consequences for understanding of the evolution of the Polish Basin in the Late Cretaceous, including its subsidence and burial history, deposition, and tectonic development. A re-evaluation of the chronostratigraphy of the Upper Cretaceous of the Polish Basin is needed to temporally constrain the succession of sedimentary and tectonic events revealed here.
中文翻译:
基于区域地震资料的波兰中部(Grudziądz-Polik地区)上白垩统沉积构造
对 Grudziądz-Polik 地区波兰 SPANTM 调查的区域高分辨率地震数据的解释揭示了上白垩统序列的新沉积结构,这与先前假设的层饼模型大不相同,通常应用于二叠纪-中生代序列。一个以前未被认识的区域不整合面将上白垩纪的序列划分为两个单元,其特征是内部几何结构非常不同,已被识别并绘制成地图。 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 下部单元通常具有层饼内部图案,上部单元由区域性低角度序列组成,该序列向南向外收缩。 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 这种新发现的区域模式在以前基于钻孔数据的区域汇编中仍未被识别,这表明整个上白垩统普遍存在层饼沉积结构。这张上白垩世沉积模式的新图像对于了解晚白垩世波兰盆地的演化具有深远的影响,包括其沉降和埋藏历史、沉积和构造发展。需要重新评估波兰盆地上白垩统的年代地层学,以在时间上限制这里揭示的沉积和构造事件的序列。