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Record of earthquake phenomena in a Lower–Middle Triassic sedimentary basin (North Sudetic Synclinorium, Lower Silesia, SW Poland)
Geological Quarterly ( IF 1 ) Pub Date : 2023-01-04 , DOI: 10.7306/gq.1670
Karol Durkowski

Deposits of the Röt Formation (Lower–Middle Triassic) in the eastern part of the North-Sudetic Synclinorium (Bolesławiec Syncline), SW Poland, include numerous synsedimentary deformation structures. Six boreholes with a total core length of ~434 m enabled macroscopic analysis and description of these deformation structures, supplemented by borehole log interpretation, calcimetric analysis, and interpretation of 2D surface seismics. An interval up to ~42 m-thick at the base of the Röt Formation showed both brittle and soft-sediment deformation structures. Their abundance and intensity decrease towards the top of the Röt Formation, and they completely disappear in the Muschelkalk (Middle Triassic). Both the number of boreholes and their locations indicate the presence of such structures across the entire study area. The occurrence of deformation structures in each borehole analysed and their large lateral range suggest that the uppermost part of the Lower Triassic and lowermost part of the Middle Triassic in the study area were influenced by seismic activity. As a result, tectonic reorganization of the study area is inferred for the latest Early/earliest Middle Triassic.



中文翻译:

中下三叠世沉积盆地地震现象记录(北苏台同斜岩,下西里西亚,波兰西南部)

Röt 组(下-中三叠世)位于波兰西南部北苏台同斜(Bolesławiec 向斜)东部的沉积物包括许多同沉积变形构造。六个总岩心长度约为 434 米的钻孔能够对这些变形结构进行宏观分析和描述,并辅以钻孔测井解释、钙化分析和二维地面地震解释。Röt 地层底部厚约 42 米的层段显示出脆性和软沉积物变形结构。它们的丰度和强度向 Röt 地层顶部逐渐减小,并且在 Muschelkalk(中三叠世)中完全消失。钻孔的数量及其位置表明整个研究区域都存在此类结构。分析的各钻孔变形构造的出现及其较大的横向范围表明研究区下三叠统上部和中三叠统下部受地震活动影响。因此,推断研究区的构造重组为最新的早/最早的中三叠世。

更新日期:2023-01-06
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