History of the East Antarctic Ice Sheet since the mid-Miocene: New Evidence from Provenance of Ice-rafted Debris
Abstract: Intellectual Merit: The PIs propose to study the stability and dynamics of the East Antarctic ice sheet during the Pliocene in the area of the Wilkes and Aurora subglacial basins. Models indicate the ice sheet is most sensitive to warming in these low-lying areas. This study is important a...
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dataone:http://get.iedadata.org/metadata/iso/600116 2023-11-08T14:14:08+01:00 History of the East Antarctic Ice Sheet since the mid-Miocene: New Evidence from Provenance of Ice-rafted Debris Williams, Trevor Hemming, Sidney R ENVELOPE(-55.0,163.0,-58.0,-78.0) BEGINDATE: 2010-07-15T00:00:00Z ENDDATE: 2014-06-30T00:00:00Z 2014-01-01T00:00:00Z http://get.iedadata.org/metadata/iso/600116 unknown IEDA: US Antarctic Program Data Center IODP U1356 IODP U1361 ODP1165 Antarctic Earth Sciences Geochronology Marine Sediments Southern Ocean Cryosphere Solid Earth George V Land Prydz Bay Wilkes Land US Antarctic Program Data Center (USAP-DC) Dataset 2014 dataone:urn:node:IEDA_USAP 2023-11-08T13:42:00Z Abstract: Intellectual Merit: The PIs propose to study the stability and dynamics of the East Antarctic ice sheet during the Pliocene in the area of the Wilkes and Aurora subglacial basins. Models indicate the ice sheet is most sensitive to warming in these low-lying areas. This study is important as there is very little direct evidence about which parts of the East Antarctic ice sheet became unstable under warm conditions. In a pilot study the PIs have shown that the isotopic geochemical signature of downcore ice-rafted debris (IRD) can be linked to continental source areas indicating which parts of the ice sheet reached the coast and calved IRD-bearing icebergs. Their initial results suggest rapid iceberg discharge from the Wilkes Land and Adelie Land coastal areas at times in the late Miocene and early Pliocene. In this study the PIs will analyze IRD from IODP sediment cores collected on the continental rise off East Antarctica. By analyzing 40Ar/39Ar ages of hornblende IRD grains, U-Pb ages of zircons, and Sm-Nd isotopes of the fine fraction of several IRD-rich layers for each core, they will be able to fingerprint continental source areas that indicate ice extent and dynamics on East Antarctica. The PIs will also carry out detailed studies across a few of these layers to characterize the anatomy of the ice-rafting event and better understand the mechanism of ice destabilization. Broader impacts: The data collected will be important for scientists in a broad variety of fields. The project will involve one undergraduate student and one summer intern at LDEO, and a graduate student at Imperial College London. The project will expose to cutting edge methodologies as well as an international research team. Data from the project will be deposited in the online databases (SedDB) and all results and methods will be made available to the scientific community through publications in peer-reviewed journals and attendance at international conferences Dataset Adelie Land Antarc* Antarctic Antarctica East Antarctica George V Land Ice Sheet Iceberg* Prydz Bay Southern Ocean Wilkes Land IEDA: US Antarctic Program Data Center (via DataONE) Antarctic Southern Ocean East Antarctica Prydz Bay East Antarctic Ice Sheet Wilkes Land ENVELOPE(120.000,120.000,-69.000,-69.000) George V Land ENVELOPE(148.000,148.000,-68.500,-68.500) ENVELOPE(-55.0,163.0,-58.0,-78.0) |
institution |
Open Polar |
collection |
IEDA: US Antarctic Program Data Center (via DataONE) |
op_collection_id |
dataone:urn:node:IEDA_USAP |
language |
unknown |
topic |
IODP U1356 IODP U1361 ODP1165 Antarctic Earth Sciences Geochronology Marine Sediments Southern Ocean Cryosphere Solid Earth George V Land Prydz Bay Wilkes Land US Antarctic Program Data Center (USAP-DC) |
spellingShingle |
IODP U1356 IODP U1361 ODP1165 Antarctic Earth Sciences Geochronology Marine Sediments Southern Ocean Cryosphere Solid Earth George V Land Prydz Bay Wilkes Land US Antarctic Program Data Center (USAP-DC) Williams, Trevor Hemming, Sidney R History of the East Antarctic Ice Sheet since the mid-Miocene: New Evidence from Provenance of Ice-rafted Debris |
topic_facet |
IODP U1356 IODP U1361 ODP1165 Antarctic Earth Sciences Geochronology Marine Sediments Southern Ocean Cryosphere Solid Earth George V Land Prydz Bay Wilkes Land US Antarctic Program Data Center (USAP-DC) |
description |
Abstract: Intellectual Merit: The PIs propose to study the stability and dynamics of the East Antarctic ice sheet during the Pliocene in the area of the Wilkes and Aurora subglacial basins. Models indicate the ice sheet is most sensitive to warming in these low-lying areas. This study is important as there is very little direct evidence about which parts of the East Antarctic ice sheet became unstable under warm conditions. In a pilot study the PIs have shown that the isotopic geochemical signature of downcore ice-rafted debris (IRD) can be linked to continental source areas indicating which parts of the ice sheet reached the coast and calved IRD-bearing icebergs. Their initial results suggest rapid iceberg discharge from the Wilkes Land and Adelie Land coastal areas at times in the late Miocene and early Pliocene. In this study the PIs will analyze IRD from IODP sediment cores collected on the continental rise off East Antarctica. By analyzing 40Ar/39Ar ages of hornblende IRD grains, U-Pb ages of zircons, and Sm-Nd isotopes of the fine fraction of several IRD-rich layers for each core, they will be able to fingerprint continental source areas that indicate ice extent and dynamics on East Antarctica. The PIs will also carry out detailed studies across a few of these layers to characterize the anatomy of the ice-rafting event and better understand the mechanism of ice destabilization. Broader impacts: The data collected will be important for scientists in a broad variety of fields. The project will involve one undergraduate student and one summer intern at LDEO, and a graduate student at Imperial College London. The project will expose to cutting edge methodologies as well as an international research team. Data from the project will be deposited in the online databases (SedDB) and all results and methods will be made available to the scientific community through publications in peer-reviewed journals and attendance at international conferences |
format |
Dataset |
author |
Williams, Trevor Hemming, Sidney R |
author_facet |
Williams, Trevor Hemming, Sidney R |
author_sort |
Williams, Trevor |
title |
History of the East Antarctic Ice Sheet since the mid-Miocene: New Evidence from Provenance of Ice-rafted Debris |
title_short |
History of the East Antarctic Ice Sheet since the mid-Miocene: New Evidence from Provenance of Ice-rafted Debris |
title_full |
History of the East Antarctic Ice Sheet since the mid-Miocene: New Evidence from Provenance of Ice-rafted Debris |
title_fullStr |
History of the East Antarctic Ice Sheet since the mid-Miocene: New Evidence from Provenance of Ice-rafted Debris |
title_full_unstemmed |
History of the East Antarctic Ice Sheet since the mid-Miocene: New Evidence from Provenance of Ice-rafted Debris |
title_sort |
history of the east antarctic ice sheet since the mid-miocene: new evidence from provenance of ice-rafted debris |
publisher |
IEDA: US Antarctic Program Data Center |
publishDate |
2014 |
url |
http://get.iedadata.org/metadata/iso/600116 |
op_coverage |
ENVELOPE(-55.0,163.0,-58.0,-78.0) BEGINDATE: 2010-07-15T00:00:00Z ENDDATE: 2014-06-30T00:00:00Z |
long_lat |
ENVELOPE(120.000,120.000,-69.000,-69.000) ENVELOPE(148.000,148.000,-68.500,-68.500) ENVELOPE(-55.0,163.0,-58.0,-78.0) |
geographic |
Antarctic Southern Ocean East Antarctica Prydz Bay East Antarctic Ice Sheet Wilkes Land George V Land |
geographic_facet |
Antarctic Southern Ocean East Antarctica Prydz Bay East Antarctic Ice Sheet Wilkes Land George V Land |
genre |
Adelie Land Antarc* Antarctic Antarctica East Antarctica George V Land Ice Sheet Iceberg* Prydz Bay Southern Ocean Wilkes Land |
genre_facet |
Adelie Land Antarc* Antarctic Antarctica East Antarctica George V Land Ice Sheet Iceberg* Prydz Bay Southern Ocean Wilkes Land |
_version_ |
1782012266879647744 |