Seismic interpretation and structural restoration of the Heligoland glaciotectonic thrust-fault complex: Implications for multiple deformation during (pre-)Elsterian to Warthian ice advances into the southern North Sea Basin
Despite a long history of research, the locations of former ice-margins in the North Sea Basin are still uncertain. In this study, we present new palaeogeographic reconstructions of (pre-) Elsterian and Warthian ice-margins in the southeastern North Sea Basin, which were previously unknown. The reco...
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2020
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ftleibnizopen:oai:oai.leibnizopen.de:niePVYsBBwLIz6xG0g6s 2023-11-12T04:18:27+01:00 Seismic interpretation and structural restoration of the Heligoland glaciotectonic thrust-fault complex: Implications for multiple deformation during (pre-)Elsterian to Warthian ice advances into the southern North Sea Basin Winsemann, Jutta Koopmann, Hannes Tanner, David C. Lutz, Rüdiger Lang, Jörg Brandes, Christian Gaedicke, Christoph 2020 application/pdf https://oa.tib.eu/renate/handle/123456789/7743 https://doi.org/10.34657/6790 eng eng Amsterdam [u.a.] : Elsevier CC BY-NC-ND 4.0 Unported https://creativecommons.org/licenses/by-nc-nd/4.0/ Quaternary science reviews : the international multidisciplinary research and review journal 227 (2020) Glaciotectonics North Sea Pre-Elsterian ice-margin Retrodeformation Tunnel valley Warthian ice-margin 550 article Text 2020 ftleibnizopen https://doi.org/10.34657/6790 2023-10-22T23:36:17Z Despite a long history of research, the locations of former ice-margins in the North Sea Basin are still uncertain. In this study, we present new palaeogeographic reconstructions of (pre-) Elsterian and Warthian ice-margins in the southeastern North Sea Basin, which were previously unknown. The reconstructions are based on the integration of palaeo-ice flow data derived from glaciotectonic thrusts, tunnel valleys and mega-scale glacial lineations. We focus on a huge glaciotectonic thrust complex located about 10 km north of Heligoland and 50 km west of the North Frisian coast of Schleswig-Holstein (Northern Germany). Multi-channel high-resolution 2D seismic reflection data show a thrust-fault complex in the upper 300 ms TWT (ca. 240 m) of seismic data. This thrust-fault complex consists of mainly Neogene delta sediments, covers an area of 350 km2, and forms part of a large belt of glaciotectonic complexes that stretches from offshore Denmark via northern Germany to Poland. The deformation front of the Heligoland glaciotectonic complex trends approximately NNE-SSW. The total length of the glaciotectonic thrust complex is approximately 15 km. The thrust faults share a common detachment surface, located at a depth of 250–300 ms (TWT) (200–240 m) below sea level. The detachment surface most probably formed at a pronounced rheological boundary between Upper Miocene fine-grained pro-delta deposits and coarser-grained delta-front deposits, although we cannot rule out that deep permafrost in the glacier foreland played a role for the location of this detachment surface. Restored cross-sections reveal the shortening of the complex along the detachment to have been on average 23% (ranging from ca. 16%–50%). The determined ice movement direction from east-southeast to southeast suggests deformation by an ice advance from the Baltic region. The chronospatial relationship of the thrust-fault complex and adjacent northwest-southeast to northeast-southwest trending Elsterian tunnel valleys implies a pre-Elsterian (MIS 16?) age ... Article in Journal/Newspaper Ice permafrost Unknown |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
ftleibnizopen |
language |
English |
topic |
Glaciotectonics North Sea Pre-Elsterian ice-margin Retrodeformation Tunnel valley Warthian ice-margin 550 |
spellingShingle |
Glaciotectonics North Sea Pre-Elsterian ice-margin Retrodeformation Tunnel valley Warthian ice-margin 550 Winsemann, Jutta Koopmann, Hannes Tanner, David C. Lutz, Rüdiger Lang, Jörg Brandes, Christian Gaedicke, Christoph Seismic interpretation and structural restoration of the Heligoland glaciotectonic thrust-fault complex: Implications for multiple deformation during (pre-)Elsterian to Warthian ice advances into the southern North Sea Basin |
topic_facet |
Glaciotectonics North Sea Pre-Elsterian ice-margin Retrodeformation Tunnel valley Warthian ice-margin 550 |
description |
Despite a long history of research, the locations of former ice-margins in the North Sea Basin are still uncertain. In this study, we present new palaeogeographic reconstructions of (pre-) Elsterian and Warthian ice-margins in the southeastern North Sea Basin, which were previously unknown. The reconstructions are based on the integration of palaeo-ice flow data derived from glaciotectonic thrusts, tunnel valleys and mega-scale glacial lineations. We focus on a huge glaciotectonic thrust complex located about 10 km north of Heligoland and 50 km west of the North Frisian coast of Schleswig-Holstein (Northern Germany). Multi-channel high-resolution 2D seismic reflection data show a thrust-fault complex in the upper 300 ms TWT (ca. 240 m) of seismic data. This thrust-fault complex consists of mainly Neogene delta sediments, covers an area of 350 km2, and forms part of a large belt of glaciotectonic complexes that stretches from offshore Denmark via northern Germany to Poland. The deformation front of the Heligoland glaciotectonic complex trends approximately NNE-SSW. The total length of the glaciotectonic thrust complex is approximately 15 km. The thrust faults share a common detachment surface, located at a depth of 250–300 ms (TWT) (200–240 m) below sea level. The detachment surface most probably formed at a pronounced rheological boundary between Upper Miocene fine-grained pro-delta deposits and coarser-grained delta-front deposits, although we cannot rule out that deep permafrost in the glacier foreland played a role for the location of this detachment surface. Restored cross-sections reveal the shortening of the complex along the detachment to have been on average 23% (ranging from ca. 16%–50%). The determined ice movement direction from east-southeast to southeast suggests deformation by an ice advance from the Baltic region. The chronospatial relationship of the thrust-fault complex and adjacent northwest-southeast to northeast-southwest trending Elsterian tunnel valleys implies a pre-Elsterian (MIS 16?) age ... |
format |
Article in Journal/Newspaper |
author |
Winsemann, Jutta Koopmann, Hannes Tanner, David C. Lutz, Rüdiger Lang, Jörg Brandes, Christian Gaedicke, Christoph |
author_facet |
Winsemann, Jutta Koopmann, Hannes Tanner, David C. Lutz, Rüdiger Lang, Jörg Brandes, Christian Gaedicke, Christoph |
author_sort |
Winsemann, Jutta |
title |
Seismic interpretation and structural restoration of the Heligoland glaciotectonic thrust-fault complex: Implications for multiple deformation during (pre-)Elsterian to Warthian ice advances into the southern North Sea Basin |
title_short |
Seismic interpretation and structural restoration of the Heligoland glaciotectonic thrust-fault complex: Implications for multiple deformation during (pre-)Elsterian to Warthian ice advances into the southern North Sea Basin |
title_full |
Seismic interpretation and structural restoration of the Heligoland glaciotectonic thrust-fault complex: Implications for multiple deformation during (pre-)Elsterian to Warthian ice advances into the southern North Sea Basin |
title_fullStr |
Seismic interpretation and structural restoration of the Heligoland glaciotectonic thrust-fault complex: Implications for multiple deformation during (pre-)Elsterian to Warthian ice advances into the southern North Sea Basin |
title_full_unstemmed |
Seismic interpretation and structural restoration of the Heligoland glaciotectonic thrust-fault complex: Implications for multiple deformation during (pre-)Elsterian to Warthian ice advances into the southern North Sea Basin |
title_sort |
seismic interpretation and structural restoration of the heligoland glaciotectonic thrust-fault complex: implications for multiple deformation during (pre-)elsterian to warthian ice advances into the southern north sea basin |
publisher |
Amsterdam [u.a.] : Elsevier |
publishDate |
2020 |
url |
https://oa.tib.eu/renate/handle/123456789/7743 https://doi.org/10.34657/6790 |
genre |
Ice permafrost |
genre_facet |
Ice permafrost |
op_source |
Quaternary science reviews : the international multidisciplinary research and review journal 227 (2020) |
op_rights |
CC BY-NC-ND 4.0 Unported https://creativecommons.org/licenses/by-nc-nd/4.0/ |
op_doi |
https://doi.org/10.34657/6790 |
_version_ |
1782335064262049792 |