Quaternary Antarctic Bottom-Water History: Deep-Sea Benthonic Foraminiferal Evidence from the Southeast Indian Ocean
Distinct assemblages of Recent deep-sea benthonic foraminifera from the southeast Indian Ocean have been shown to be associated with Antarctic Bottom Water (AABW) and Indian Bottom Water (IBW). The AABW assemblage is divided into two groups. One is dominated by Epistominella umbonifera and is associ...
Published in: | Quaternary Research |
---|---|
Main Author: | |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Cambridge University Press (CUP)
1979
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1016/0033-5894(79)90062-0 http://api.elsevier.com/content/article/PII:0033589479900620?httpAccept=text/xml http://api.elsevier.com/content/article/PII:0033589479900620?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400030301 |
id |
crcambridgeupr:10.1016/0033-5894(79)90062-0 |
---|---|
record_format |
openpolar |
spelling |
crcambridgeupr:10.1016/0033-5894(79)90062-0 2024-06-09T07:40:14+00:00 Quaternary Antarctic Bottom-Water History: Deep-Sea Benthonic Foraminiferal Evidence from the Southeast Indian Ocean Corliss, Bruce H. 1979 http://dx.doi.org/10.1016/0033-5894(79)90062-0 http://api.elsevier.com/content/article/PII:0033589479900620?httpAccept=text/xml http://api.elsevier.com/content/article/PII:0033589479900620?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400030301 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Quaternary Research volume 12, issue 2, page 271-289 ISSN 0033-5894 1096-0287 journal-article 1979 crcambridgeupr https://doi.org/10.1016/0033-5894(79)90062-0 2024-05-15T13:10:33Z Distinct assemblages of Recent deep-sea benthonic foraminifera from the southeast Indian Ocean have been shown to be associated with Antarctic Bottom Water (AABW) and Indian Bottom Water (IBW). The AABW assemblage is divided into two groups. One is dominated by Epistominella umbonifera and is associated with AABW having temperatures between −0.2° and 0.4°C. The second group is dominated by Globocassidulina subglobosa and is associated with AABW having temperatures between 0.6° and 0.8°C. The IBW assemblage is marked by the strong dominance of Uvigerina spp. and Epistominella exigua . The faunal-water-mass relationships have been used to infer the history of bottom-water circulation over the last 500,000 yr in this region using faunal data from four Eltanin cores. One core was taken from the Southeast Indian Ridge in association with IBW, and three were taken from the flank of the ridge associated with AABW flowing within a western boundary contour current in the South Australian Basin. Little faunal variation exists in the core beneath IBW (E48-22), indicating that IBW was present on the Southeast Indian Ridge during the last 300,000 yr. A record of the intensity of AABW circulation during the last 500,000 yr is inferred from the benthonic foraminiferal data in the three cores located within the western boundary contour current. Marked oscillations in the relative proportions of AABW and IBW faunal assemblages are found in one core, E48-03. The faunal variations are inferred to have resulted from variation in intensity of AABW circulation between 500,000 and 195,000 yr B.P. In E48-03, the AABW assemblage was present most of the time between 500,000 and 195,000 yr B.P., with low intensity of AABW circulation occurring primarily during the equivalent of stages 8 and 7 ( t = 305,000 to 195,000 yr B.P.). The intensity of AABW circulation varied, with a maximum occurring during the equivalent of stage 11 ( t = 420,000 yr B.P.). Two additional cores, E45-27 and E45–74, show relatively constant intensity of AABW ... Article in Journal/Newspaper Antarc* Antarctic Cambridge University Press Antarctic Indian Southeast Indian Ridge ENVELOPE(110.000,110.000,-50.000,-50.000) Quaternary Research 12 2 271 289 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
description |
Distinct assemblages of Recent deep-sea benthonic foraminifera from the southeast Indian Ocean have been shown to be associated with Antarctic Bottom Water (AABW) and Indian Bottom Water (IBW). The AABW assemblage is divided into two groups. One is dominated by Epistominella umbonifera and is associated with AABW having temperatures between −0.2° and 0.4°C. The second group is dominated by Globocassidulina subglobosa and is associated with AABW having temperatures between 0.6° and 0.8°C. The IBW assemblage is marked by the strong dominance of Uvigerina spp. and Epistominella exigua . The faunal-water-mass relationships have been used to infer the history of bottom-water circulation over the last 500,000 yr in this region using faunal data from four Eltanin cores. One core was taken from the Southeast Indian Ridge in association with IBW, and three were taken from the flank of the ridge associated with AABW flowing within a western boundary contour current in the South Australian Basin. Little faunal variation exists in the core beneath IBW (E48-22), indicating that IBW was present on the Southeast Indian Ridge during the last 300,000 yr. A record of the intensity of AABW circulation during the last 500,000 yr is inferred from the benthonic foraminiferal data in the three cores located within the western boundary contour current. Marked oscillations in the relative proportions of AABW and IBW faunal assemblages are found in one core, E48-03. The faunal variations are inferred to have resulted from variation in intensity of AABW circulation between 500,000 and 195,000 yr B.P. In E48-03, the AABW assemblage was present most of the time between 500,000 and 195,000 yr B.P., with low intensity of AABW circulation occurring primarily during the equivalent of stages 8 and 7 ( t = 305,000 to 195,000 yr B.P.). The intensity of AABW circulation varied, with a maximum occurring during the equivalent of stage 11 ( t = 420,000 yr B.P.). Two additional cores, E45-27 and E45–74, show relatively constant intensity of AABW ... |
format |
Article in Journal/Newspaper |
author |
Corliss, Bruce H. |
spellingShingle |
Corliss, Bruce H. Quaternary Antarctic Bottom-Water History: Deep-Sea Benthonic Foraminiferal Evidence from the Southeast Indian Ocean |
author_facet |
Corliss, Bruce H. |
author_sort |
Corliss, Bruce H. |
title |
Quaternary Antarctic Bottom-Water History: Deep-Sea Benthonic Foraminiferal Evidence from the Southeast Indian Ocean |
title_short |
Quaternary Antarctic Bottom-Water History: Deep-Sea Benthonic Foraminiferal Evidence from the Southeast Indian Ocean |
title_full |
Quaternary Antarctic Bottom-Water History: Deep-Sea Benthonic Foraminiferal Evidence from the Southeast Indian Ocean |
title_fullStr |
Quaternary Antarctic Bottom-Water History: Deep-Sea Benthonic Foraminiferal Evidence from the Southeast Indian Ocean |
title_full_unstemmed |
Quaternary Antarctic Bottom-Water History: Deep-Sea Benthonic Foraminiferal Evidence from the Southeast Indian Ocean |
title_sort |
quaternary antarctic bottom-water history: deep-sea benthonic foraminiferal evidence from the southeast indian ocean |
publisher |
Cambridge University Press (CUP) |
publishDate |
1979 |
url |
http://dx.doi.org/10.1016/0033-5894(79)90062-0 http://api.elsevier.com/content/article/PII:0033589479900620?httpAccept=text/xml http://api.elsevier.com/content/article/PII:0033589479900620?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400030301 |
long_lat |
ENVELOPE(110.000,110.000,-50.000,-50.000) |
geographic |
Antarctic Indian Southeast Indian Ridge |
geographic_facet |
Antarctic Indian Southeast Indian Ridge |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Quaternary Research volume 12, issue 2, page 271-289 ISSN 0033-5894 1096-0287 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1016/0033-5894(79)90062-0 |
container_title |
Quaternary Research |
container_volume |
12 |
container_issue |
2 |
container_start_page |
271 |
op_container_end_page |
289 |
_version_ |
1801383692159942656 |