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. 14 C kyr BP....
Published in: | The Holocene |
---|---|
Main Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
SAGE Publications
2001
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1191/095968301678302896 http://journals.sagepub.com/doi/pdf/10.1191/095968301678302896 |
id |
crsagepubl:10.1191/095968301678302896 |
---|---|
record_format |
openpolar |
spelling |
crsagepubl:10.1191/095968301678302896 2023-05-15T14:09:43+02:00 Evidence from diatoms for Holocene climate fluctuation along the East Antarctic margin Taylor, Fiona McMinn, Andrew 2001 http://dx.doi.org/10.1191/095968301678302896 http://journals.sagepub.com/doi/pdf/10.1191/095968301678302896 en eng SAGE Publications http://journals.sagepub.com/page/policies/text-and-data-mining-license The Holocene volume 11, issue 4, page 455-466 ISSN 0959-6836 1477-0911 Paleontology Earth-Surface Processes Ecology Archeology Global and Planetary Change journal-article 2001 crsagepubl https://doi.org/10.1191/095968301678302896 2022-08-12T11:29:47Z 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. 14 C 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. 14 C 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 sedi ment 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. 14 C 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 SAGE Publications (via Crossref) Antarctic East Antarctica The Holocene 11 4 455 466 |
institution |
Open Polar |
collection |
SAGE Publications (via Crossref) |
op_collection_id |
crsagepubl |
language |
English |
topic |
Paleontology Earth-Surface Processes Ecology Archeology Global and Planetary Change |
spellingShingle |
Paleontology Earth-Surface Processes Ecology Archeology Global and Planetary Change Taylor, Fiona McMinn, Andrew Evidence from diatoms for Holocene climate fluctuation along the East Antarctic margin |
topic_facet |
Paleontology Earth-Surface Processes Ecology Archeology Global and Planetary Change |
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. 14 C 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. 14 C 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 sedi ment 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. 14 C 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, Fiona McMinn, Andrew |
author_facet |
Taylor, Fiona McMinn, Andrew |
author_sort |
Taylor, Fiona |
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 |
SAGE Publications |
publishDate |
2001 |
url |
http://dx.doi.org/10.1191/095968301678302896 http://journals.sagepub.com/doi/pdf/10.1191/095968301678302896 |
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_source |
The Holocene volume 11, issue 4, page 455-466 ISSN 0959-6836 1477-0911 |
op_rights |
http://journals.sagepub.com/page/policies/text-and-data-mining-license |
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_ |
1766281728794558464 |