Depositional processes on the distal Scoresby Trough Mouth Fan (ODP Site 987): Implications for the Pleistocene evolution of the Scoresby Sund Sector of the Greenland Ice Sheet
Accepted manuscript version, licensed CC BY-NC-ND 4.0. Published version available at https://doi.org/10.1016/j.margeo.2017.11.018 . The investigation of trough mouth fans (TMFs), important paleoclimatic archives on mid- and high-latitude continental margins, has so far mainly been based on the inte...
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Online Access: | https://hdl.handle.net/10037/14698 https://doi.org/10.1016/j.margeo.2017.11.018 |
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ftunivtroemsoe:oai:munin.uit.no:10037/14698 2023-05-15T16:03:45+02:00 Depositional processes on the distal Scoresby Trough Mouth Fan (ODP Site 987): Implications for the Pleistocene evolution of the Scoresby Sund Sector of the Greenland Ice Sheet Laberg, Jan Sverre Rydningen, Tom Arne Forwick, Matthias Husum, Katrine 2017-11-28 https://hdl.handle.net/10037/14698 https://doi.org/10.1016/j.margeo.2017.11.018 eng eng Elsevier Marine Geology Laberg, J.S., Rydningen, T.A., Forwick, M. & Husum, K. (2018). Depositional processes on the distal Scoresby Trough Mouth Fan (ODP Site 987): Implications for the Pleistocene evolution of the Scoresby Sund Sector of the Greenland Ice Sheet. Marine Geology, 402 , 51-59. https://doi.org/10.1016/j.margeo.2017.11.018 FRIDAID 1624900 doi:10.1016/j.margeo.2017.11.018 0025-3227 1872-6151 https://hdl.handle.net/10037/14698 openAccess VDP::Mathematics and natural science: 400::Geosciences: 450::Marine geology: 466 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Marin geologi: 466 Trough mouth fans Paleoclimatic archives High-latitude continental margins East Greenland Greenland Ice Sheet VDP::Mathematics and natural science: 400::Geosciences: 450::Quaternary geology glaciology: 465 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Kvartærgeologi glasiologi: 465 Journal article Tidsskriftartikkel Peer reviewed 2017 ftunivtroemsoe https://doi.org/10.1016/j.margeo.2017.11.018 2021-06-25T17:56:17Z Accepted manuscript version, licensed CC BY-NC-ND 4.0. Published version available at https://doi.org/10.1016/j.margeo.2017.11.018 . The investigation of trough mouth fans (TMFs), important paleoclimatic archives on mid- and high-latitude continental margins, has so far mainly been based on the integration of various types of acoustic data supplemented with short sediments cores. In consequence, sedimentological and chronological data about parts of TMFs deposited prior to the Last Glacial Maximum remains sparse. Here, we re-evaluate the upper part of ODP Site 987 drilled on the distal part of the Scoresby Sund TMF on the east Greenland continental margin, which records the former dynamics of the Scoresby Sund sector of the Greenland Ice Sheet. Based on a more detailed sedimentological description than previously available we find that lithological unit I, deposited over the last ~ 2.14 Ma, can be divided into two parts, a lower part dominated by glacimarine and marine deposits including some scattered, sandy turbidites and an upper part of debris flow deposits interbedded with sandy turbidites. The transition between these parts occurred at about 0.99 Ma, i.e. at the same time when the mode of ice-sheet variation changed globally, the average ice sheet size increased significantly and the periodicity of ice-volume variation increased from around 41 ka to approximately 100 ka (the “Mid-Pleistocene Transition”). On the distal Scoresby Sund TMF, this change appears to be reflected through a marked increase in the abundance of sandy turbidity flows accompanied by a longer run-out of some of the debris flows due to the delivery of larger sediment volumes during longer-lasting glacial maxima. This suggests that long sediment cores from TMFs have the potential to record the major climatic trends occurring during the Pleistocene. Article in Journal/Newspaper East Greenland Greenland Ice Sheet Scoresby Sund University of Tromsø: Munin Open Research Archive Greenland Scoresby ENVELOPE(162.750,162.750,-66.567,-66.567) Scoresby Sund ENVELOPE(-24.387,-24.387,70.476,70.476) Sund ENVELOPE(13.644,13.644,66.207,66.207) Marine Geology 402 51 59 |
institution |
Open Polar |
collection |
University of Tromsø: Munin Open Research Archive |
op_collection_id |
ftunivtroemsoe |
language |
English |
topic |
VDP::Mathematics and natural science: 400::Geosciences: 450::Marine geology: 466 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Marin geologi: 466 Trough mouth fans Paleoclimatic archives High-latitude continental margins East Greenland Greenland Ice Sheet VDP::Mathematics and natural science: 400::Geosciences: 450::Quaternary geology glaciology: 465 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Kvartærgeologi glasiologi: 465 |
spellingShingle |
VDP::Mathematics and natural science: 400::Geosciences: 450::Marine geology: 466 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Marin geologi: 466 Trough mouth fans Paleoclimatic archives High-latitude continental margins East Greenland Greenland Ice Sheet VDP::Mathematics and natural science: 400::Geosciences: 450::Quaternary geology glaciology: 465 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Kvartærgeologi glasiologi: 465 Laberg, Jan Sverre Rydningen, Tom Arne Forwick, Matthias Husum, Katrine Depositional processes on the distal Scoresby Trough Mouth Fan (ODP Site 987): Implications for the Pleistocene evolution of the Scoresby Sund Sector of the Greenland Ice Sheet |
topic_facet |
VDP::Mathematics and natural science: 400::Geosciences: 450::Marine geology: 466 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Marin geologi: 466 Trough mouth fans Paleoclimatic archives High-latitude continental margins East Greenland Greenland Ice Sheet VDP::Mathematics and natural science: 400::Geosciences: 450::Quaternary geology glaciology: 465 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Kvartærgeologi glasiologi: 465 |
description |
Accepted manuscript version, licensed CC BY-NC-ND 4.0. Published version available at https://doi.org/10.1016/j.margeo.2017.11.018 . The investigation of trough mouth fans (TMFs), important paleoclimatic archives on mid- and high-latitude continental margins, has so far mainly been based on the integration of various types of acoustic data supplemented with short sediments cores. In consequence, sedimentological and chronological data about parts of TMFs deposited prior to the Last Glacial Maximum remains sparse. Here, we re-evaluate the upper part of ODP Site 987 drilled on the distal part of the Scoresby Sund TMF on the east Greenland continental margin, which records the former dynamics of the Scoresby Sund sector of the Greenland Ice Sheet. Based on a more detailed sedimentological description than previously available we find that lithological unit I, deposited over the last ~ 2.14 Ma, can be divided into two parts, a lower part dominated by glacimarine and marine deposits including some scattered, sandy turbidites and an upper part of debris flow deposits interbedded with sandy turbidites. The transition between these parts occurred at about 0.99 Ma, i.e. at the same time when the mode of ice-sheet variation changed globally, the average ice sheet size increased significantly and the periodicity of ice-volume variation increased from around 41 ka to approximately 100 ka (the “Mid-Pleistocene Transition”). On the distal Scoresby Sund TMF, this change appears to be reflected through a marked increase in the abundance of sandy turbidity flows accompanied by a longer run-out of some of the debris flows due to the delivery of larger sediment volumes during longer-lasting glacial maxima. This suggests that long sediment cores from TMFs have the potential to record the major climatic trends occurring during the Pleistocene. |
format |
Article in Journal/Newspaper |
author |
Laberg, Jan Sverre Rydningen, Tom Arne Forwick, Matthias Husum, Katrine |
author_facet |
Laberg, Jan Sverre Rydningen, Tom Arne Forwick, Matthias Husum, Katrine |
author_sort |
Laberg, Jan Sverre |
title |
Depositional processes on the distal Scoresby Trough Mouth Fan (ODP Site 987): Implications for the Pleistocene evolution of the Scoresby Sund Sector of the Greenland Ice Sheet |
title_short |
Depositional processes on the distal Scoresby Trough Mouth Fan (ODP Site 987): Implications for the Pleistocene evolution of the Scoresby Sund Sector of the Greenland Ice Sheet |
title_full |
Depositional processes on the distal Scoresby Trough Mouth Fan (ODP Site 987): Implications for the Pleistocene evolution of the Scoresby Sund Sector of the Greenland Ice Sheet |
title_fullStr |
Depositional processes on the distal Scoresby Trough Mouth Fan (ODP Site 987): Implications for the Pleistocene evolution of the Scoresby Sund Sector of the Greenland Ice Sheet |
title_full_unstemmed |
Depositional processes on the distal Scoresby Trough Mouth Fan (ODP Site 987): Implications for the Pleistocene evolution of the Scoresby Sund Sector of the Greenland Ice Sheet |
title_sort |
depositional processes on the distal scoresby trough mouth fan (odp site 987): implications for the pleistocene evolution of the scoresby sund sector of the greenland ice sheet |
publisher |
Elsevier |
publishDate |
2017 |
url |
https://hdl.handle.net/10037/14698 https://doi.org/10.1016/j.margeo.2017.11.018 |
long_lat |
ENVELOPE(162.750,162.750,-66.567,-66.567) ENVELOPE(-24.387,-24.387,70.476,70.476) ENVELOPE(13.644,13.644,66.207,66.207) |
geographic |
Greenland Scoresby Scoresby Sund Sund |
geographic_facet |
Greenland Scoresby Scoresby Sund Sund |
genre |
East Greenland Greenland Ice Sheet Scoresby Sund |
genre_facet |
East Greenland Greenland Ice Sheet Scoresby Sund |
op_relation |
Marine Geology Laberg, J.S., Rydningen, T.A., Forwick, M. & Husum, K. (2018). Depositional processes on the distal Scoresby Trough Mouth Fan (ODP Site 987): Implications for the Pleistocene evolution of the Scoresby Sund Sector of the Greenland Ice Sheet. Marine Geology, 402 , 51-59. https://doi.org/10.1016/j.margeo.2017.11.018 FRIDAID 1624900 doi:10.1016/j.margeo.2017.11.018 0025-3227 1872-6151 https://hdl.handle.net/10037/14698 |
op_rights |
openAccess |
op_doi |
https://doi.org/10.1016/j.margeo.2017.11.018 |
container_title |
Marine Geology |
container_volume |
402 |
container_start_page |
51 |
op_container_end_page |
59 |
_version_ |
1766399442949242880 |