Some features of deformation structures in an esker on the southern margin of the Fennoscandian shield
As a result of melting of the last ice sheet in the southeastern edge of the Fennoscandian shield, ridge structures called eskers were formed. One of these eskers is the subject of our study. We have identified both typical non-deformed sedimentary layers and specific intrusive mixture of sand and s...
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| Format: | Article |
| Language: | English |
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Geological Society of Finland
2018-12-01
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| Series: | Bulletin of the Geological Society of Finland |
| Subjects: | |
| Online Access: | http://www.geologinenseura.fi/bulletin/Volume90/Bulletin_vol90_2_291-300_2018_Poleshchuk-etal.pdf |
| _version_ | 1811276131329900544 |
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| author | A. Poleshchuk D. Zykov S. Shvarev |
| author_facet | A. Poleshchuk D. Zykov S. Shvarev |
| author_sort | A. Poleshchuk |
| collection | DOAJ |
| description | As a result of melting of the last ice sheet in the southeastern edge of the Fennoscandian shield, ridge structures called eskers were formed. One of these eskers is the subject of our study. We have identified both typical non-deformed sedimentary layers and specific intrusive mixture of sand and silt in the esker. The sand and silt were deformed with formation of recumbent and overturned folds, which indicate that they have experienced displacement in a ductile (wet) state. The formation of similar dislocations (diapir folds or glacial intrusion structures) can occur as a result of either dead ice melting or liquefaction during earthquakes. |
| first_indexed | 2024-04-12T23:50:59Z |
| format | Article |
| id | doaj.art-0be0d866ee034a16a83a99ee219da551 |
| institution | Directory Open Access Journal |
| issn | 0367-5211 1799-4632 |
| language | English |
| last_indexed | 2024-04-12T23:50:59Z |
| publishDate | 2018-12-01 |
| publisher | Geological Society of Finland |
| record_format | Article |
| series | Bulletin of the Geological Society of Finland |
| spelling | doaj.art-0be0d866ee034a16a83a99ee219da5512022-12-22T03:11:41ZengGeological Society of FinlandBulletin of the Geological Society of Finland0367-52111799-46322018-12-0190229130010.17741/bgsf/90.2.011Some features of deformation structures in an esker on the southern margin of the Fennoscandian shieldA. PoleshchukD. ZykovS. ShvarevAs a result of melting of the last ice sheet in the southeastern edge of the Fennoscandian shield, ridge structures called eskers were formed. One of these eskers is the subject of our study. We have identified both typical non-deformed sedimentary layers and specific intrusive mixture of sand and silt in the esker. The sand and silt were deformed with formation of recumbent and overturned folds, which indicate that they have experienced displacement in a ductile (wet) state. The formation of similar dislocations (diapir folds or glacial intrusion structures) can occur as a result of either dead ice melting or liquefaction during earthquakes.http://www.geologinenseura.fi/bulletin/Volume90/Bulletin_vol90_2_291-300_2018_Poleshchuk-etal.pdfeskersFennoscandian Shieldliquefactionneotectonicspalaeoearthquakesdeformation structuresdislocationsintrusion |
| spellingShingle | A. Poleshchuk D. Zykov S. Shvarev Some features of deformation structures in an esker on the southern margin of the Fennoscandian shield Bulletin of the Geological Society of Finland eskers Fennoscandian Shield liquefaction neotectonics palaeoearthquakes deformation structures dislocations intrusion |
| title | Some features of deformation structures in an esker on the southern margin of the Fennoscandian shield |
| title_full | Some features of deformation structures in an esker on the southern margin of the Fennoscandian shield |
| title_fullStr | Some features of deformation structures in an esker on the southern margin of the Fennoscandian shield |
| title_full_unstemmed | Some features of deformation structures in an esker on the southern margin of the Fennoscandian shield |
| title_short | Some features of deformation structures in an esker on the southern margin of the Fennoscandian shield |
| title_sort | some features of deformation structures in an esker on the southern margin of the fennoscandian shield |
| topic | eskers Fennoscandian Shield liquefaction neotectonics palaeoearthquakes deformation structures dislocations intrusion |
| url | http://www.geologinenseura.fi/bulletin/Volume90/Bulletin_vol90_2_291-300_2018_Poleshchuk-etal.pdf |
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