Holocene Sediment Records From the Continental Shelf of Mac. Robertson Land, East Antarctica
Geochemical records are presented for five sediment cores from basins on the continental shelf of Mac. Robertson Land, East Antarctica. The cores contain 2-4 m thick sequences of hemipelagic, siliceous mud and ooze (SMO) deposited under seasonally open marine conditions. The inner and middle shelf S...
Published in: | Paleoceanography |
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Main Authors: | , , , , , |
Format: | Article in Journal/Newspaper |
Language: | unknown |
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ODU Digital Commons
2001
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Online Access: | https://digitalcommons.odu.edu/oeas_fac_pubs/106 https://doi.org/10.1029/2000pa000504 https://digitalcommons.odu.edu/context/oeas_fac_pubs/article/1088/viewcontent/Sedwick_2001_Holocene_sediment_records_from_th.pdf |
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ftolddominionuni:oai:digitalcommons.odu.edu:oeas_fac_pubs-1088 2023-06-11T04:04:40+02:00 Holocene Sediment Records From the Continental Shelf of Mac. Robertson Land, East Antarctica Sedwick, Peter N. Harris, Peter T. Robertson, Lisette G. McMurtry, Gary M. Cremer, Maximilian D. Robinson, Philip 2001-01-01T08:00:00Z application/pdf https://digitalcommons.odu.edu/oeas_fac_pubs/106 https://doi.org/10.1029/2000pa000504 https://digitalcommons.odu.edu/context/oeas_fac_pubs/article/1088/viewcontent/Sedwick_2001_Holocene_sediment_records_from_th.pdf unknown ODU Digital Commons https://digitalcommons.odu.edu/oeas_fac_pubs/106 doi:10.1029/2000pa000504 https://digitalcommons.odu.edu/context/oeas_fac_pubs/article/1088/viewcontent/Sedwick_2001_Holocene_sediment_records_from_th.pdf OES Faculty Publications Marginal ice zone Diatoms Corethon layers Polynya Ross Sea Southern Ocean Marine sediments Phytoplankton biomass Spatial patterns Biogenic silica Organic carbon Bottom water Contintental shelf Biogeochemistry Marine Biology Oceanography Paleontology article 2001 ftolddominionuni https://doi.org/10.1029/2000pa000504 2023-05-08T17:59:31Z Geochemical records are presented for five sediment cores from basins on the continental shelf of Mac. Robertson Land, East Antarctica. The cores contain 2-4 m thick sequences of hemipelagic, siliceous mud and ooze (SMO) deposited under seasonally open marine conditions. The inner and middle shelf SMO sequences are massive dark olive green material, whereas the outer shelf SMO sequences are dark olive material interspersed with light olive green layers similar to1-10 cm thick. The biogenic material is dominated by marine diatoms including Fragilariopsis curta, Fragilariopsis cylindrus, and Chaetoceros spp. in the dark-colored SMO and Corethron criophilum in the light-colored layers. Radiocarbon dates suggest that the cores provide continuous accumulation records extending from < 1 kyr before present (B.P.) back as far as 4-15 kyr B.P., with estimated accumulation rates of 0.07-5 mm yr(-1). The three core records from the middle and outer shelf suggest six episodes of increased accumulation of biogenic material at 5.5 kyr B.P. tall three cores), 1, 2, and 6.2 kyr B.P. (two of the three cores), and 3.8 and 10.8 kyr B.P. tone core), most of which coincide with Corethron layers. We interpret these features as the result of enhanced diatom production over the outer shelf, possibly related to climatic warm periods. The absence of such features in the inner shelf core records is thought to reflect a relatively constant level of seasonal diatom production in adjacent waters maintained by a coastal polynya. Article in Journal/Newspaper Antarc* Antarctica East Antarctica Mac Robertson Land Mac. Robertson Land Ross Sea Southern Ocean Old Dominion University: ODU Digital Commons Southern Ocean East Antarctica Ross Sea Mac. Robertson Land ENVELOPE(65.000,65.000,-70.000,-70.000) Paleoceanography 16 2 212 225 |
institution |
Open Polar |
collection |
Old Dominion University: ODU Digital Commons |
op_collection_id |
ftolddominionuni |
language |
unknown |
topic |
Marginal ice zone Diatoms Corethon layers Polynya Ross Sea Southern Ocean Marine sediments Phytoplankton biomass Spatial patterns Biogenic silica Organic carbon Bottom water Contintental shelf Biogeochemistry Marine Biology Oceanography Paleontology |
spellingShingle |
Marginal ice zone Diatoms Corethon layers Polynya Ross Sea Southern Ocean Marine sediments Phytoplankton biomass Spatial patterns Biogenic silica Organic carbon Bottom water Contintental shelf Biogeochemistry Marine Biology Oceanography Paleontology Sedwick, Peter N. Harris, Peter T. Robertson, Lisette G. McMurtry, Gary M. Cremer, Maximilian D. Robinson, Philip Holocene Sediment Records From the Continental Shelf of Mac. Robertson Land, East Antarctica |
topic_facet |
Marginal ice zone Diatoms Corethon layers Polynya Ross Sea Southern Ocean Marine sediments Phytoplankton biomass Spatial patterns Biogenic silica Organic carbon Bottom water Contintental shelf Biogeochemistry Marine Biology Oceanography Paleontology |
description |
Geochemical records are presented for five sediment cores from basins on the continental shelf of Mac. Robertson Land, East Antarctica. The cores contain 2-4 m thick sequences of hemipelagic, siliceous mud and ooze (SMO) deposited under seasonally open marine conditions. The inner and middle shelf SMO sequences are massive dark olive green material, whereas the outer shelf SMO sequences are dark olive material interspersed with light olive green layers similar to1-10 cm thick. The biogenic material is dominated by marine diatoms including Fragilariopsis curta, Fragilariopsis cylindrus, and Chaetoceros spp. in the dark-colored SMO and Corethron criophilum in the light-colored layers. Radiocarbon dates suggest that the cores provide continuous accumulation records extending from < 1 kyr before present (B.P.) back as far as 4-15 kyr B.P., with estimated accumulation rates of 0.07-5 mm yr(-1). The three core records from the middle and outer shelf suggest six episodes of increased accumulation of biogenic material at 5.5 kyr B.P. tall three cores), 1, 2, and 6.2 kyr B.P. (two of the three cores), and 3.8 and 10.8 kyr B.P. tone core), most of which coincide with Corethron layers. We interpret these features as the result of enhanced diatom production over the outer shelf, possibly related to climatic warm periods. The absence of such features in the inner shelf core records is thought to reflect a relatively constant level of seasonal diatom production in adjacent waters maintained by a coastal polynya. |
format |
Article in Journal/Newspaper |
author |
Sedwick, Peter N. Harris, Peter T. Robertson, Lisette G. McMurtry, Gary M. Cremer, Maximilian D. Robinson, Philip |
author_facet |
Sedwick, Peter N. Harris, Peter T. Robertson, Lisette G. McMurtry, Gary M. Cremer, Maximilian D. Robinson, Philip |
author_sort |
Sedwick, Peter N. |
title |
Holocene Sediment Records From the Continental Shelf of Mac. Robertson Land, East Antarctica |
title_short |
Holocene Sediment Records From the Continental Shelf of Mac. Robertson Land, East Antarctica |
title_full |
Holocene Sediment Records From the Continental Shelf of Mac. Robertson Land, East Antarctica |
title_fullStr |
Holocene Sediment Records From the Continental Shelf of Mac. Robertson Land, East Antarctica |
title_full_unstemmed |
Holocene Sediment Records From the Continental Shelf of Mac. Robertson Land, East Antarctica |
title_sort |
holocene sediment records from the continental shelf of mac. robertson land, east antarctica |
publisher |
ODU Digital Commons |
publishDate |
2001 |
url |
https://digitalcommons.odu.edu/oeas_fac_pubs/106 https://doi.org/10.1029/2000pa000504 https://digitalcommons.odu.edu/context/oeas_fac_pubs/article/1088/viewcontent/Sedwick_2001_Holocene_sediment_records_from_th.pdf |
long_lat |
ENVELOPE(65.000,65.000,-70.000,-70.000) |
geographic |
Southern Ocean East Antarctica Ross Sea Mac. Robertson Land |
geographic_facet |
Southern Ocean East Antarctica Ross Sea Mac. Robertson Land |
genre |
Antarc* Antarctica East Antarctica Mac Robertson Land Mac. Robertson Land Ross Sea Southern Ocean |
genre_facet |
Antarc* Antarctica East Antarctica Mac Robertson Land Mac. Robertson Land Ross Sea Southern Ocean |
op_source |
OES Faculty Publications |
op_relation |
https://digitalcommons.odu.edu/oeas_fac_pubs/106 doi:10.1029/2000pa000504 https://digitalcommons.odu.edu/context/oeas_fac_pubs/article/1088/viewcontent/Sedwick_2001_Holocene_sediment_records_from_th.pdf |
op_doi |
https://doi.org/10.1029/2000pa000504 |
container_title |
Paleoceanography |
container_volume |
16 |
container_issue |
2 |
container_start_page |
212 |
op_container_end_page |
225 |
_version_ |
1768389716884848640 |