Middle Pleistocene ice-marginal sedimentation in the transitional zone between the constrained and unconstrained ice-sheet margin, East Anglia, England
<jats:p>It is uncommon in the North Sea basin and northwestern Europe for the ice‐marginal glacial successions of the Middle Pleistocene, Anglian (Elsterian) age to be well preserved and not overridden by subsequent glaciations. The existence of extensive and thick (<jats:italic>˜</ja...
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ftunivcam:oai:www.repository.cam.ac.uk:1810/263760 2024-02-04T10:01:15+01:00 Middle Pleistocene ice-marginal sedimentation in the transitional zone between the constrained and unconstrained ice-sheet margin, East Anglia, England Leszczynska, K Boreham, S Gibbard, PL 2017 application/pdf https://www.repository.cam.ac.uk/handle/1810/263760 https://doi.org/10.17863/CAM.9132 English eng eng Wiley http://dx.doi.org/10.1111/bor.12239 Boreas https://www.repository.cam.ac.uk/handle/1810/263760 doi:10.17863/CAM.9132 37 Earth Sciences 3709 Physical Geography and Environmental Geoscience 3705 Geology 14 Life Below Water Article 2017 ftunivcam https://doi.org/10.17863/CAM.9132 2024-01-11T23:22:45Z <jats:p>It is uncommon in the North Sea basin and northwestern Europe for the ice‐marginal glacial successions of the Middle Pleistocene, Anglian (Elsterian) age to be well preserved and not overridden by subsequent glaciations. The existence of extensive and thick (<jats:italic>˜</jats:italic>20 m) Middle Pleistocene sand and gravel successions in East Anglia, England, provide a unique opportunity to reconstruct and understand the palaeoenvironmental conditions in the Anglian ice‐marginal zone, and further across the North Sea basin. This paper uses data from 80 sections in two sand and gravel quarries in East Anglia to provide the first evidence concerning: (i) the character of the ice‐marginal processes in the unique, transitional zone between the topographically constrained and unconstrained Anglian ice‐sheet margin; (ii) the role of meltwater in the re‐shaping of topographically driven preglacial drainage; and (iii) the position and the number of oscillations of the Anglian ice‐sheet margin in the form of a sediment‐landform assemblage. Moreover the current research adds to the discussion on the presence and extent of the proglacial lake in the North Sea Basin during the Anglian glaciation. The sand and gravel successions in the Anglian ice‐marginal zone are primarily reworked proto‐Thames sediments deposited by meltwater. At the beginning of the glaciation, the meltwater followed the preglacial (proto‐Thames) river course. However, as the ice sheet advanced, it was re‐routed, overwhelming and abandoning the old river course and depositing an extensive ice‐marginal subaqueous fan. The succession includes evidence for at least two enhanced meltwater release events, as well as indications of glaciolacustrine sedimentation. The character of the described sedimentary settings is discussed in the wider context of the presence of the North Sea Lake.</jats:p> Article in Journal/Newspaper Ice Sheet Apollo - University of Cambridge Repository |
institution |
Open Polar |
collection |
Apollo - University of Cambridge Repository |
op_collection_id |
ftunivcam |
language |
English |
topic |
37 Earth Sciences 3709 Physical Geography and Environmental Geoscience 3705 Geology 14 Life Below Water |
spellingShingle |
37 Earth Sciences 3709 Physical Geography and Environmental Geoscience 3705 Geology 14 Life Below Water Leszczynska, K Boreham, S Gibbard, PL Middle Pleistocene ice-marginal sedimentation in the transitional zone between the constrained and unconstrained ice-sheet margin, East Anglia, England |
topic_facet |
37 Earth Sciences 3709 Physical Geography and Environmental Geoscience 3705 Geology 14 Life Below Water |
description |
<jats:p>It is uncommon in the North Sea basin and northwestern Europe for the ice‐marginal glacial successions of the Middle Pleistocene, Anglian (Elsterian) age to be well preserved and not overridden by subsequent glaciations. The existence of extensive and thick (<jats:italic>˜</jats:italic>20 m) Middle Pleistocene sand and gravel successions in East Anglia, England, provide a unique opportunity to reconstruct and understand the palaeoenvironmental conditions in the Anglian ice‐marginal zone, and further across the North Sea basin. This paper uses data from 80 sections in two sand and gravel quarries in East Anglia to provide the first evidence concerning: (i) the character of the ice‐marginal processes in the unique, transitional zone between the topographically constrained and unconstrained Anglian ice‐sheet margin; (ii) the role of meltwater in the re‐shaping of topographically driven preglacial drainage; and (iii) the position and the number of oscillations of the Anglian ice‐sheet margin in the form of a sediment‐landform assemblage. Moreover the current research adds to the discussion on the presence and extent of the proglacial lake in the North Sea Basin during the Anglian glaciation. The sand and gravel successions in the Anglian ice‐marginal zone are primarily reworked proto‐Thames sediments deposited by meltwater. At the beginning of the glaciation, the meltwater followed the preglacial (proto‐Thames) river course. However, as the ice sheet advanced, it was re‐routed, overwhelming and abandoning the old river course and depositing an extensive ice‐marginal subaqueous fan. The succession includes evidence for at least two enhanced meltwater release events, as well as indications of glaciolacustrine sedimentation. The character of the described sedimentary settings is discussed in the wider context of the presence of the North Sea Lake.</jats:p> |
format |
Article in Journal/Newspaper |
author |
Leszczynska, K Boreham, S Gibbard, PL |
author_facet |
Leszczynska, K Boreham, S Gibbard, PL |
author_sort |
Leszczynska, K |
title |
Middle Pleistocene ice-marginal sedimentation in the transitional zone between the constrained and unconstrained ice-sheet margin, East Anglia, England |
title_short |
Middle Pleistocene ice-marginal sedimentation in the transitional zone between the constrained and unconstrained ice-sheet margin, East Anglia, England |
title_full |
Middle Pleistocene ice-marginal sedimentation in the transitional zone between the constrained and unconstrained ice-sheet margin, East Anglia, England |
title_fullStr |
Middle Pleistocene ice-marginal sedimentation in the transitional zone between the constrained and unconstrained ice-sheet margin, East Anglia, England |
title_full_unstemmed |
Middle Pleistocene ice-marginal sedimentation in the transitional zone between the constrained and unconstrained ice-sheet margin, East Anglia, England |
title_sort |
middle pleistocene ice-marginal sedimentation in the transitional zone between the constrained and unconstrained ice-sheet margin, east anglia, england |
publisher |
Wiley |
publishDate |
2017 |
url |
https://www.repository.cam.ac.uk/handle/1810/263760 https://doi.org/10.17863/CAM.9132 |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_relation |
https://www.repository.cam.ac.uk/handle/1810/263760 doi:10.17863/CAM.9132 |
op_doi |
https://doi.org/10.17863/CAM.9132 |
_version_ |
1789967003286503424 |