Iceberg Alley, East Antarctic Margin: Continuously laminated diatomaceous sediments from the late Holocene
A 24-meter jumbo piston core (NBP0101 JPC41) collected from an inner shelf basin in Iceberg Alley reveals an approximately 2000-year history of unusually high primary productivity. Iceberg Alley, an ~ 85 km long and 10–20 km wide cross-shelf trough on the Mac.Robertson Shelf, East Antarctica, reache...
Published in: | Marine Micropaleontology |
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Language: | English |
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2018
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Online Access: | https://orca.cardiff.ac.uk/id/eprint/109007/ https://doi.org/10.1016/j.marmicro.2017.12.002 https://orca.cardiff.ac.uk/id/eprint/109007/1/Iceberg%20Alley%20East%20Antarctic%20Margin.pdf |
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ftunivcardiff:oai:https://orca.cardiff.ac.uk:109007 2023-05-15T13:57:24+02:00 Iceberg Alley, East Antarctic Margin: Continuously laminated diatomaceous sediments from the late Holocene Alley, Karen Patacca, Kaylie Pike, Jennifer Dunbar, Rob Leventer, Amy 2018-04-01 application/pdf https://orca.cardiff.ac.uk/id/eprint/109007/ https://doi.org/10.1016/j.marmicro.2017.12.002 https://orca.cardiff.ac.uk/id/eprint/109007/1/Iceberg%20Alley%20East%20Antarctic%20Margin.pdf en eng Elsevier https://orca.cardiff.ac.uk/id/eprint/109007/1/Iceberg%20Alley%20East%20Antarctic%20Margin.pdf Alley, Karen, Patacca, Kaylie, Pike, Jennifer https://orca.cardiff.ac.uk/view/cardiffauthors/A0179070.html orcid:0000-0001-9415-6003 orcid:0000-0001-9415-6003, Dunbar, Rob and Leventer, Amy 2018. Iceberg Alley, East Antarctic Margin: Continuously laminated diatomaceous sediments from the late Holocene. Marine Micropaleontology 140 , pp. 56-68. 10.1016/j.marmicro.2017.12.002 https://doi.org/10.1016/j.marmicro.2017.12.002 file https://orca.cardiff.ac.uk/id/eprint/109007/1/Iceberg%20Alley%20East%20Antarctic%20Margin.pdf doi:10.1016/j.marmicro.2017.12.002 Article PeerReviewed 2018 ftunivcardiff https://doi.org/10.1016/j.marmicro.2017.12.002 2022-10-27T22:43:19Z A 24-meter jumbo piston core (NBP0101 JPC41) collected from an inner shelf basin in Iceberg Alley reveals an approximately 2000-year history of unusually high primary productivity. Iceberg Alley, an ~ 85 km long and 10–20 km wide cross-shelf trough on the Mac.Robertson Shelf, East Antarctica, reaches depths of 850 m and is bounded on either side by shallow banks that are lined with grounded icebergs. The sediments are laminated on a mm- to cm-scale throughout and are highly biosiliceous. Microscopic examination of smear slides, quantitative diatom slides, and sediment thin sections reveals that the sediments are visually dominated by the diatom Corethron pennatum, a large and lightly silicified species notable for its long and narrow shape; the valves, girdle bands and spines are all exceptionally well-preserved, suggesting rapid sedimentation. Other common species include sea ice-related Fragilariopsis, such as F. curta and F. cylindrus, with lesser contribution from other large diatoms, including Rhizosolenia spp. and Chaetoceros Ehrenberg subg. Chaetoceros. Chaetoceros Ehrenberg subg. Hyalochaete Gran resting spores, typically associated with large early-season blooms and common in many laminated sedimentary sections around the Antarctic margin, are surprisingly rare. Laminae with any significant terrigenous component are also very rare. Individual laminations appear to represent blooms, and in some cases sub-seasonal events are likely preserved. We suggest that this productive system is associated with the continuous presence of low-salinity meltwater derived from a combination of sea ice melt and grounded icebergs, which may be a source for a steady supply of micronutrients such as iron to the surface mixed layer. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Iceberg* Sea ice Cardiff University: ORCA (Online Research @ Cardiff) Antarctic East Antarctica The Antarctic Marine Micropaleontology 140 56 68 |
institution |
Open Polar |
collection |
Cardiff University: ORCA (Online Research @ Cardiff) |
op_collection_id |
ftunivcardiff |
language |
English |
description |
A 24-meter jumbo piston core (NBP0101 JPC41) collected from an inner shelf basin in Iceberg Alley reveals an approximately 2000-year history of unusually high primary productivity. Iceberg Alley, an ~ 85 km long and 10–20 km wide cross-shelf trough on the Mac.Robertson Shelf, East Antarctica, reaches depths of 850 m and is bounded on either side by shallow banks that are lined with grounded icebergs. The sediments are laminated on a mm- to cm-scale throughout and are highly biosiliceous. Microscopic examination of smear slides, quantitative diatom slides, and sediment thin sections reveals that the sediments are visually dominated by the diatom Corethron pennatum, a large and lightly silicified species notable for its long and narrow shape; the valves, girdle bands and spines are all exceptionally well-preserved, suggesting rapid sedimentation. Other common species include sea ice-related Fragilariopsis, such as F. curta and F. cylindrus, with lesser contribution from other large diatoms, including Rhizosolenia spp. and Chaetoceros Ehrenberg subg. Chaetoceros. Chaetoceros Ehrenberg subg. Hyalochaete Gran resting spores, typically associated with large early-season blooms and common in many laminated sedimentary sections around the Antarctic margin, are surprisingly rare. Laminae with any significant terrigenous component are also very rare. Individual laminations appear to represent blooms, and in some cases sub-seasonal events are likely preserved. We suggest that this productive system is associated with the continuous presence of low-salinity meltwater derived from a combination of sea ice melt and grounded icebergs, which may be a source for a steady supply of micronutrients such as iron to the surface mixed layer. |
format |
Article in Journal/Newspaper |
author |
Alley, Karen Patacca, Kaylie Pike, Jennifer Dunbar, Rob Leventer, Amy |
spellingShingle |
Alley, Karen Patacca, Kaylie Pike, Jennifer Dunbar, Rob Leventer, Amy Iceberg Alley, East Antarctic Margin: Continuously laminated diatomaceous sediments from the late Holocene |
author_facet |
Alley, Karen Patacca, Kaylie Pike, Jennifer Dunbar, Rob Leventer, Amy |
author_sort |
Alley, Karen |
title |
Iceberg Alley, East Antarctic Margin: Continuously laminated diatomaceous sediments from the late Holocene |
title_short |
Iceberg Alley, East Antarctic Margin: Continuously laminated diatomaceous sediments from the late Holocene |
title_full |
Iceberg Alley, East Antarctic Margin: Continuously laminated diatomaceous sediments from the late Holocene |
title_fullStr |
Iceberg Alley, East Antarctic Margin: Continuously laminated diatomaceous sediments from the late Holocene |
title_full_unstemmed |
Iceberg Alley, East Antarctic Margin: Continuously laminated diatomaceous sediments from the late Holocene |
title_sort |
iceberg alley, east antarctic margin: continuously laminated diatomaceous sediments from the late holocene |
publisher |
Elsevier |
publishDate |
2018 |
url |
https://orca.cardiff.ac.uk/id/eprint/109007/ https://doi.org/10.1016/j.marmicro.2017.12.002 https://orca.cardiff.ac.uk/id/eprint/109007/1/Iceberg%20Alley%20East%20Antarctic%20Margin.pdf |
geographic |
Antarctic East Antarctica The Antarctic |
geographic_facet |
Antarctic East Antarctica The Antarctic |
genre |
Antarc* Antarctic Antarctica East Antarctica Iceberg* Sea ice |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Iceberg* Sea ice |
op_relation |
https://orca.cardiff.ac.uk/id/eprint/109007/1/Iceberg%20Alley%20East%20Antarctic%20Margin.pdf Alley, Karen, Patacca, Kaylie, Pike, Jennifer https://orca.cardiff.ac.uk/view/cardiffauthors/A0179070.html orcid:0000-0001-9415-6003 orcid:0000-0001-9415-6003, Dunbar, Rob and Leventer, Amy 2018. Iceberg Alley, East Antarctic Margin: Continuously laminated diatomaceous sediments from the late Holocene. Marine Micropaleontology 140 , pp. 56-68. 10.1016/j.marmicro.2017.12.002 https://doi.org/10.1016/j.marmicro.2017.12.002 file https://orca.cardiff.ac.uk/id/eprint/109007/1/Iceberg%20Alley%20East%20Antarctic%20Margin.pdf doi:10.1016/j.marmicro.2017.12.002 |
op_doi |
https://doi.org/10.1016/j.marmicro.2017.12.002 |
container_title |
Marine Micropaleontology |
container_volume |
140 |
container_start_page |
56 |
op_container_end_page |
68 |
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1766265082744930304 |