Processes of sedimentation in Gollum Channel, Porcupine Seabight: submersible observations and sediment analyses
Abstract Manned submersible dives were conducted in the submarine canyon channel system of Porcupine Seabight, NE Atlantic Ocean. Visual observations were made, and sediment samples collected and analysed to elucidate the nature of the sedimentary regime. In the upper part of the canyon (480-940 m w...
Published in: | Transactions of the Royal Society of Edinburgh: Earth Sciences |
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Language: | English |
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Cambridge University Press (CUP)
1995
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Online Access: | http://dx.doi.org/10.1017/s0263593300002157 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0263593300002157 |
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crcambridgeupr:10.1017/s0263593300002157 2024-03-03T08:46:22+00:00 Processes of sedimentation in Gollum Channel, Porcupine Seabight: submersible observations and sediment analyses Tudhope, Alexander W. Scoffin, Terence P. 1995 http://dx.doi.org/10.1017/s0263593300002157 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0263593300002157 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Transactions of the Royal Society of Edinburgh: Earth Sciences volume 86, issue 1, page 49-55 ISSN 0263-5933 1473-7116 Paleontology Earth and Planetary Sciences (miscellaneous) journal-article 1995 crcambridgeupr https://doi.org/10.1017/s0263593300002157 2024-02-08T08:44:39Z Abstract Manned submersible dives were conducted in the submarine canyon channel system of Porcupine Seabight, NE Atlantic Ocean. Visual observations were made, and sediment samples collected and analysed to elucidate the nature of the sedimentary regime. In the upper part of the canyon (480-940 m water depth) sediments consisted of a mixture of terrigenous quartz rich silts and sands, skeletal carbonate of benthonic and planktonic origin and minor clay minerals and authigenic dolomite. There were localised Lophelia pertusa coral thickets on both the flanks and floor of the canyon. Sedimentary structures and physical measurements revealed there to be active transport of sediments in the canyon down to a depth of at least 940 m, effected by (?tidal) reversing currents and bioturbation. In these parts of the canyon, deposits around glacial dropstones and coral thickets indicate that there has been a maximum of 0-1 m of net sediment accumulation since the last glacial period. At 3000 m water depth, in the channel system, the sediments were fine calcareous ooze with a drape (up to 0-3 m thick) of flocculant phytoplankton detritus. At these depths, there was no evidence for present-day sediment resuspension by currents. Article in Journal/Newspaper Lophelia pertusa Cambridge University Press Porcupine Seabight ENVELOPE(-13.000,-13.000,50.500,50.500) Transactions of the Royal Society of Edinburgh: Earth Sciences 86 1 49 55 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Paleontology Earth and Planetary Sciences (miscellaneous) |
spellingShingle |
Paleontology Earth and Planetary Sciences (miscellaneous) Tudhope, Alexander W. Scoffin, Terence P. Processes of sedimentation in Gollum Channel, Porcupine Seabight: submersible observations and sediment analyses |
topic_facet |
Paleontology Earth and Planetary Sciences (miscellaneous) |
description |
Abstract Manned submersible dives were conducted in the submarine canyon channel system of Porcupine Seabight, NE Atlantic Ocean. Visual observations were made, and sediment samples collected and analysed to elucidate the nature of the sedimentary regime. In the upper part of the canyon (480-940 m water depth) sediments consisted of a mixture of terrigenous quartz rich silts and sands, skeletal carbonate of benthonic and planktonic origin and minor clay minerals and authigenic dolomite. There were localised Lophelia pertusa coral thickets on both the flanks and floor of the canyon. Sedimentary structures and physical measurements revealed there to be active transport of sediments in the canyon down to a depth of at least 940 m, effected by (?tidal) reversing currents and bioturbation. In these parts of the canyon, deposits around glacial dropstones and coral thickets indicate that there has been a maximum of 0-1 m of net sediment accumulation since the last glacial period. At 3000 m water depth, in the channel system, the sediments were fine calcareous ooze with a drape (up to 0-3 m thick) of flocculant phytoplankton detritus. At these depths, there was no evidence for present-day sediment resuspension by currents. |
format |
Article in Journal/Newspaper |
author |
Tudhope, Alexander W. Scoffin, Terence P. |
author_facet |
Tudhope, Alexander W. Scoffin, Terence P. |
author_sort |
Tudhope, Alexander W. |
title |
Processes of sedimentation in Gollum Channel, Porcupine Seabight: submersible observations and sediment analyses |
title_short |
Processes of sedimentation in Gollum Channel, Porcupine Seabight: submersible observations and sediment analyses |
title_full |
Processes of sedimentation in Gollum Channel, Porcupine Seabight: submersible observations and sediment analyses |
title_fullStr |
Processes of sedimentation in Gollum Channel, Porcupine Seabight: submersible observations and sediment analyses |
title_full_unstemmed |
Processes of sedimentation in Gollum Channel, Porcupine Seabight: submersible observations and sediment analyses |
title_sort |
processes of sedimentation in gollum channel, porcupine seabight: submersible observations and sediment analyses |
publisher |
Cambridge University Press (CUP) |
publishDate |
1995 |
url |
http://dx.doi.org/10.1017/s0263593300002157 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0263593300002157 |
long_lat |
ENVELOPE(-13.000,-13.000,50.500,50.500) |
geographic |
Porcupine Seabight |
geographic_facet |
Porcupine Seabight |
genre |
Lophelia pertusa |
genre_facet |
Lophelia pertusa |
op_source |
Transactions of the Royal Society of Edinburgh: Earth Sciences volume 86, issue 1, page 49-55 ISSN 0263-5933 1473-7116 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0263593300002157 |
container_title |
Transactions of the Royal Society of Edinburgh: Earth Sciences |
container_volume |
86 |
container_issue |
1 |
container_start_page |
49 |
op_container_end_page |
55 |
_version_ |
1792502389007187968 |