Abstract

A study of a section exposed in a quarry near ​​the village of Loukhi revealed a radial kame ridge composed of horizontally layered lacustrine sands with cross-bedded sand lenses and interlayers of siltstone with a 0.2- to 1.2-m-thick horizon of convolutions occurring as wide synclines, narrow anticlines, and pseudonodules. The lacustrine sediments overlain by sand and gravel sediments with paleosols down the slope of the ridge give way to moraine boulder sands overlying the heavily dislocated strata. The objective of this work is to analyze the conditions for the formation of the kame and the deformation structures in its section as possible indicators of paleoseismicity. To account for the structural features of the section, it is proposed that the ridge formed as a result of the projection of sediments of a flowing subglacial lake, which emerged in the body of the glacier during the deglaciation period, onto the moraine. A structural analysis of reverse faults in the dislocated sediments proved their gravitational nature, which is not evident from glaciotectonics, indicating the immobility of the ice mass during ridge formation. Convolutions are developed in layers of a narrow granulometric range (fine-grained sands and silts), which is significantly different from seismites in subaqueous sediments of highly seismic regions. Therefore, these structures are not associated with seismic liquefaction, although the section is 40 km from the southwestern side of the Kandalaksha graben, where Holocene 8.0-point paleoearthquakes with moderate magnitudes were revealed. Thus, the study did not confirm the occurrence of ​​paleoearthquakes with M ≥ 6–6.5 in the study area during the Late Ice Age.

中文翻译：

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Sharvaozero Kame（北卡累利阿）的形成和同生变形的细节

摘要

对Loukhi村附近采石场裸露部分的研究表明，一个放射状的kame脊由水平分层的湖相沙层和交叉层状的沙状透镜以及粉砂岩夹层组成，其旋积层厚度为0.2至1.2 m发生为宽向斜，窄背斜和假结核。湖底沉积物覆盖着沙子，砾石沉积物和山脊斜坡下方的古土壤被覆盖在严重错位的地层上的冰ora巨石沙子所取代。这项工作的目的是分析kame的形成条件及其截面的变形结构，作为古地震的可能指标。考虑到该部分的结构特征，建议该脊是由于流动的冰川下湖泊沉积物的投影而形成的，在冰消期期间出现在冰川体内的冰onto上。对错位沉积物中反向断层的结构分析证明了它们的重力性质，这从冰川构造学上不能明显地看出，这表明了山脊形成过程中冰块的固定性。在狭窄的粒度范围（细颗粒的沙子和粉砂）中形成褶积，这与高地震区水下沉积物中的地震岩有很大的不同。因此，尽管该断层距离坎达拉克夏grab西南部40公里，但发现了中等强度的全新世8.0点古地震，但这些结构与地震液化无关。因此，该研究没有证实古地震的发生与中号≥6-6.5晚冰期的研究领域。