Evidence from diatoms for Holocene climate fluctuation along the East Antarctic margin
Diatom assemblages in two Holocene sediment cores (GC1 and GC2) from the Mac. Robertson Shelf, East Antarctica, are compared with modern sedimentary diatom assemblages from the same area. Open marine deposition commenced in Iceberg Alley (GC1), on the outer continental shelf, >10.7 adj. 14C kyr B...
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Arnold, Hodder Headline Plc
2001
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Online Access: | https://doi.org/10.1191/095968301678302896 http://ecite.utas.edu.au/22317 |
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ftunivtasecite:oai:ecite.utas.edu.au:22317 2023-05-15T13:59:07+02:00 Evidence from diatoms for Holocene climate fluctuation along the East Antarctic margin Taylor, F McMinn, A 2001 https://doi.org/10.1191/095968301678302896 http://ecite.utas.edu.au/22317 en eng Arnold, Hodder Headline Plc http://dx.doi.org/10.1191/095968301678302896 Taylor, F and McMinn, A, Evidence from diatoms for Holocene climate fluctuation along the East Antarctic margin, The Holocene, 11, (4) pp. 455-466. ISSN 0959-6836 (2001) [Refereed Article] http://ecite.utas.edu.au/22317 Earth Sciences Geology Palaeontology (incl. Palynology) Refereed Article PeerReviewed 2001 ftunivtasecite https://doi.org/10.1191/095968301678302896 2019-12-13T21:04:19Z Diatom assemblages in two Holocene sediment cores (GC1 and GC2) from the Mac. Robertson Shelf, East Antarctica, are compared with modern sedimentary diatom assemblages from the same area. Open marine deposition commenced in Iceberg Alley (GC1), on the outer continental shelf, >10.7 adj. 14C kyr BP. Chaetoceros resting spores, which may indicate water-column stabilization from melting glacial and/or sea ice or the maximum summer sea-ice retreat, dominate the diatom assemblage. Approximately 7.5 adj. 14C kyr BP, a sea-ice diatom assemblage was deposited. This assemblage is similar to that being deposited in the surface sediments of the Mac. Robertson Shelf today and suggests that perennial sea ice has persisted in the vicinity of Iceberg Alley since that time. Interbedded within the sea-ice assemblage, however, are Corethron-rich sediment layers that suggest mid- to late-Holocene high-productivity events associated with a climatic optimum. The diatom record from Nielsen Basin (GC2), on the inner continental shelf, is relatively uniform compared to that in GC1. Glacial ice was present over the region c. >5.6 adj. 14C kyr BP and a dissolution diatom assemblage was deposited beneath it. Following ice retreat, an ice-edge diatom assemblage was deposited briefly before sea-ice conditions similar to that on the continental shelf today developed. There is no evidence in GC2 for the mid- to late-Holocene high-productivity events identified in GC1. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Iceberg* Sea ice eCite UTAS (University of Tasmania) Antarctic East Antarctica The Holocene 11 4 455 466 |
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Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Earth Sciences Geology Palaeontology (incl. Palynology) |
spellingShingle |
Earth Sciences Geology Palaeontology (incl. Palynology) Taylor, F McMinn, A Evidence from diatoms for Holocene climate fluctuation along the East Antarctic margin |
topic_facet |
Earth Sciences Geology Palaeontology (incl. Palynology) |
description |
Diatom assemblages in two Holocene sediment cores (GC1 and GC2) from the Mac. Robertson Shelf, East Antarctica, are compared with modern sedimentary diatom assemblages from the same area. Open marine deposition commenced in Iceberg Alley (GC1), on the outer continental shelf, >10.7 adj. 14C kyr BP. Chaetoceros resting spores, which may indicate water-column stabilization from melting glacial and/or sea ice or the maximum summer sea-ice retreat, dominate the diatom assemblage. Approximately 7.5 adj. 14C kyr BP, a sea-ice diatom assemblage was deposited. This assemblage is similar to that being deposited in the surface sediments of the Mac. Robertson Shelf today and suggests that perennial sea ice has persisted in the vicinity of Iceberg Alley since that time. Interbedded within the sea-ice assemblage, however, are Corethron-rich sediment layers that suggest mid- to late-Holocene high-productivity events associated with a climatic optimum. The diatom record from Nielsen Basin (GC2), on the inner continental shelf, is relatively uniform compared to that in GC1. Glacial ice was present over the region c. >5.6 adj. 14C kyr BP and a dissolution diatom assemblage was deposited beneath it. Following ice retreat, an ice-edge diatom assemblage was deposited briefly before sea-ice conditions similar to that on the continental shelf today developed. There is no evidence in GC2 for the mid- to late-Holocene high-productivity events identified in GC1. |
format |
Article in Journal/Newspaper |
author |
Taylor, F McMinn, A |
author_facet |
Taylor, F McMinn, A |
author_sort |
Taylor, F |
title |
Evidence from diatoms for Holocene climate fluctuation along the East Antarctic margin |
title_short |
Evidence from diatoms for Holocene climate fluctuation along the East Antarctic margin |
title_full |
Evidence from diatoms for Holocene climate fluctuation along the East Antarctic margin |
title_fullStr |
Evidence from diatoms for Holocene climate fluctuation along the East Antarctic margin |
title_full_unstemmed |
Evidence from diatoms for Holocene climate fluctuation along the East Antarctic margin |
title_sort |
evidence from diatoms for holocene climate fluctuation along the east antarctic margin |
publisher |
Arnold, Hodder Headline Plc |
publishDate |
2001 |
url |
https://doi.org/10.1191/095968301678302896 http://ecite.utas.edu.au/22317 |
geographic |
Antarctic East Antarctica |
geographic_facet |
Antarctic East Antarctica |
genre |
Antarc* Antarctic Antarctica East Antarctica Iceberg* Sea ice |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Iceberg* Sea ice |
op_relation |
http://dx.doi.org/10.1191/095968301678302896 Taylor, F and McMinn, A, Evidence from diatoms for Holocene climate fluctuation along the East Antarctic margin, The Holocene, 11, (4) pp. 455-466. ISSN 0959-6836 (2001) [Refereed Article] http://ecite.utas.edu.au/22317 |
op_doi |
https://doi.org/10.1191/095968301678302896 |
container_title |
The Holocene |
container_volume |
11 |
container_issue |
4 |
container_start_page |
455 |
op_container_end_page |
466 |
_version_ |
1766267513276989440 |