Antarctic ice-rafted detritus (IRD) in the South Atlantic: Indicators of iceshelf dynamics or ocean surface conditions?
Abstract Ocean sediment core TN057-13PC4/ODP1094, from the Atlantic sector of the Southern Ocean, contains elevated lithogenic material in sections representing the last glacial period compared to the Holocene. This ice-rafted detritus is mainly comprised of volcanic glass and ash, but has a signifi...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.501.5776 2023-05-15T13:47:28+02:00 Antarctic ice-rafted detritus (IRD) in the South Atlantic: Indicators of iceshelf dynamics or ocean surface conditions? Simon H. H. Nielsen D. A. Hodell The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.501.5776 http://pubs.usgs.gov/of/2007/1047/srp/srp020/of2007-1047srp020.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.501.5776 http://pubs.usgs.gov/of/2007/1047/srp/srp020/of2007-1047srp020.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://pubs.usgs.gov/of/2007/1047/srp/srp020/of2007-1047srp020.pdf text ftciteseerx 2016-01-08T09:09:43Z Abstract Ocean sediment core TN057-13PC4/ODP1094, from the Atlantic sector of the Southern Ocean, contains elevated lithogenic material in sections representing the last glacial period compared to the Holocene. This ice-rafted detritus is mainly comprised of volcanic glass and ash, but has a significant input of what was previously interpreted as quartz during peak intervals (Kanfoush et al., 2000, 2002). Our analysis of these clear mineral grains indicates that most are plagioclase, and that South Sandwich Islands is the predominant source, similar to that inferred for the volcanic glass (Nielsen et al., in review). In addition, quartz and feldspar with possible Antarctic origin occur in conjunction with postulated episodes of Antarctic deglaciation. We conclude that while sea ice was the dominant ice rafting agent in the Polar Frontal Zone of the South Atlantic during the last glacial period, the Holocene IRD variability may reflect Antarctic ice sheet dynamics. Text Antarc* Antarctic Ice Sheet Sea ice South Sandwich Islands Southern Ocean Unknown Antarctic Sandwich Islands South Sandwich Islands Southern Ocean |
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Open Polar |
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Unknown |
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ftciteseerx |
language |
English |
description |
Abstract Ocean sediment core TN057-13PC4/ODP1094, from the Atlantic sector of the Southern Ocean, contains elevated lithogenic material in sections representing the last glacial period compared to the Holocene. This ice-rafted detritus is mainly comprised of volcanic glass and ash, but has a significant input of what was previously interpreted as quartz during peak intervals (Kanfoush et al., 2000, 2002). Our analysis of these clear mineral grains indicates that most are plagioclase, and that South Sandwich Islands is the predominant source, similar to that inferred for the volcanic glass (Nielsen et al., in review). In addition, quartz and feldspar with possible Antarctic origin occur in conjunction with postulated episodes of Antarctic deglaciation. We conclude that while sea ice was the dominant ice rafting agent in the Polar Frontal Zone of the South Atlantic during the last glacial period, the Holocene IRD variability may reflect Antarctic ice sheet dynamics. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Simon H. H. Nielsen D. A. Hodell |
spellingShingle |
Simon H. H. Nielsen D. A. Hodell Antarctic ice-rafted detritus (IRD) in the South Atlantic: Indicators of iceshelf dynamics or ocean surface conditions? |
author_facet |
Simon H. H. Nielsen D. A. Hodell |
author_sort |
Simon H. H. Nielsen |
title |
Antarctic ice-rafted detritus (IRD) in the South Atlantic: Indicators of iceshelf dynamics or ocean surface conditions? |
title_short |
Antarctic ice-rafted detritus (IRD) in the South Atlantic: Indicators of iceshelf dynamics or ocean surface conditions? |
title_full |
Antarctic ice-rafted detritus (IRD) in the South Atlantic: Indicators of iceshelf dynamics or ocean surface conditions? |
title_fullStr |
Antarctic ice-rafted detritus (IRD) in the South Atlantic: Indicators of iceshelf dynamics or ocean surface conditions? |
title_full_unstemmed |
Antarctic ice-rafted detritus (IRD) in the South Atlantic: Indicators of iceshelf dynamics or ocean surface conditions? |
title_sort |
antarctic ice-rafted detritus (ird) in the south atlantic: indicators of iceshelf dynamics or ocean surface conditions? |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.501.5776 http://pubs.usgs.gov/of/2007/1047/srp/srp020/of2007-1047srp020.pdf |
geographic |
Antarctic Sandwich Islands South Sandwich Islands Southern Ocean |
geographic_facet |
Antarctic Sandwich Islands South Sandwich Islands Southern Ocean |
genre |
Antarc* Antarctic Ice Sheet Sea ice South Sandwich Islands Southern Ocean |
genre_facet |
Antarc* Antarctic Ice Sheet Sea ice South Sandwich Islands Southern Ocean |
op_source |
http://pubs.usgs.gov/of/2007/1047/srp/srp020/of2007-1047srp020.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.501.5776 http://pubs.usgs.gov/of/2007/1047/srp/srp020/of2007-1047srp020.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766247197494476800 |