Nd bulk isotopes and 40Ar/39Ar ages of individual minerals from Aurora and Wilkes sub-glacial basin sediments
The Wilkes and Aurora basins are large, low-lying sub-glacial basins that may cause areas of weakness in the overlying East Antarctic ice sheet. Previous work based on ice-rafted debris (IRD) provenance analyses found evidence for massive iceberg discharges from these areas during the late Miocene a...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.829630 2024-06-02T07:57:07+00:00 Nd bulk isotopes and 40Ar/39Ar ages of individual minerals from Aurora and Wilkes sub-glacial basin sediments Pierce, Elizabeth L Williams, Trevor J van de Flierdt, Tina Hemming, Sidney R Goldstein, Steven L Brachfeld, Stefanie A MEDIAN LATITUDE: -65.281520 * MEDIAN LONGITUDE: 128.668997 * SOUTH-BOUND LATITUDE: -70.017000 * WEST-BOUND LONGITUDE: 67.218060 * NORTH-BOUND LATITUDE: -59.005000 * EAST-BOUND LONGITUDE: 166.417000 * DATE/TIME START: 1969-01-01T00:00:00 * DATE/TIME END: 2000-02-14T20:30:00 2011 application/zip, 2 datasets https://doi.pangaea.de/10.1594/PANGAEA.829630 https://doi.org/10.1594/PANGAEA.829630 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.829630 https://doi.org/10.1594/PANGAEA.829630 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Pierce, Elizabeth L; Williams, Trevor J; van de Flierdt, Tina; Hemming, Sidney R; Goldstein, Steven L; Brachfeld, Stefanie A (2011): Characterizing the sediment provenance of East Antarctica's weak underbelly: The Aurora and Wilkes sub-glacial basins. Paleoceanography, 26(4), PA4217, https://doi.org/10.1029/2011PA002127 Ocean Drilling Program ODP Dataset 2011 ftpangaea https://doi.org/10.1594/PANGAEA.82963010.1029/2011PA002127 2024-05-07T23:45:53Z The Wilkes and Aurora basins are large, low-lying sub-glacial basins that may cause areas of weakness in the overlying East Antarctic ice sheet. Previous work based on ice-rafted debris (IRD) provenance analyses found evidence for massive iceberg discharges from these areas during the late Miocene and Pliocene. Here we characterize the sediments shed from the inferred areas of weakness along this margin (94°E to 165°E) by measuring40Ar/39Ar ages of 292 individual detrital hornblende grains from eight marine sediment core locations off East Antarctica and Nd isotopic compositions of the bulk fine fraction from the same sediments. We further expand the toolbox for Antarctic IRD provenance analyses by exploring the application of 40Ar/39Ar ages of detrital biotites; biotite as an IRD tracer eliminates lithological biases imposed by only analyzing hornblendes and allows for characterization of samples with low IRD concentrations. Our data quadruples the number of detrital 40Ar/39Ar ages from this margin of East Antarctica and leads to the following conclusions: (1) Four main sectors between the Ross Sea and Prydz Bay, separated by ice drainage divides, are distinguishable based upon the combination of 40Ar/39Ar ages of detrital hornblende and biotite grains and the e-Nd of the bulk fine fraction; (2) 40Ar/39Ar biotite ages can be used as a robust provenance tracer for this part of East Antarctica; and (3) sediments shed from the coastal areas of the Aurora and Wilkes sub-glacial basins can be clearly distinguished from one another based upon their isotopic fingerprints. Dataset Antarc* Antarctic Antarctica East Antarctica Ice Sheet Iceberg* Prydz Bay Ross Sea PANGAEA - Data Publisher for Earth & Environmental Science Antarctic East Antarctica Ross Sea Prydz Bay East Antarctic Ice Sheet ENVELOPE(67.218060,166.417000,-59.005000,-70.017000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
Ocean Drilling Program ODP |
spellingShingle |
Ocean Drilling Program ODP Pierce, Elizabeth L Williams, Trevor J van de Flierdt, Tina Hemming, Sidney R Goldstein, Steven L Brachfeld, Stefanie A Nd bulk isotopes and 40Ar/39Ar ages of individual minerals from Aurora and Wilkes sub-glacial basin sediments |
topic_facet |
Ocean Drilling Program ODP |
description |
The Wilkes and Aurora basins are large, low-lying sub-glacial basins that may cause areas of weakness in the overlying East Antarctic ice sheet. Previous work based on ice-rafted debris (IRD) provenance analyses found evidence for massive iceberg discharges from these areas during the late Miocene and Pliocene. Here we characterize the sediments shed from the inferred areas of weakness along this margin (94°E to 165°E) by measuring40Ar/39Ar ages of 292 individual detrital hornblende grains from eight marine sediment core locations off East Antarctica and Nd isotopic compositions of the bulk fine fraction from the same sediments. We further expand the toolbox for Antarctic IRD provenance analyses by exploring the application of 40Ar/39Ar ages of detrital biotites; biotite as an IRD tracer eliminates lithological biases imposed by only analyzing hornblendes and allows for characterization of samples with low IRD concentrations. Our data quadruples the number of detrital 40Ar/39Ar ages from this margin of East Antarctica and leads to the following conclusions: (1) Four main sectors between the Ross Sea and Prydz Bay, separated by ice drainage divides, are distinguishable based upon the combination of 40Ar/39Ar ages of detrital hornblende and biotite grains and the e-Nd of the bulk fine fraction; (2) 40Ar/39Ar biotite ages can be used as a robust provenance tracer for this part of East Antarctica; and (3) sediments shed from the coastal areas of the Aurora and Wilkes sub-glacial basins can be clearly distinguished from one another based upon their isotopic fingerprints. |
format |
Dataset |
author |
Pierce, Elizabeth L Williams, Trevor J van de Flierdt, Tina Hemming, Sidney R Goldstein, Steven L Brachfeld, Stefanie A |
author_facet |
Pierce, Elizabeth L Williams, Trevor J van de Flierdt, Tina Hemming, Sidney R Goldstein, Steven L Brachfeld, Stefanie A |
author_sort |
Pierce, Elizabeth L |
title |
Nd bulk isotopes and 40Ar/39Ar ages of individual minerals from Aurora and Wilkes sub-glacial basin sediments |
title_short |
Nd bulk isotopes and 40Ar/39Ar ages of individual minerals from Aurora and Wilkes sub-glacial basin sediments |
title_full |
Nd bulk isotopes and 40Ar/39Ar ages of individual minerals from Aurora and Wilkes sub-glacial basin sediments |
title_fullStr |
Nd bulk isotopes and 40Ar/39Ar ages of individual minerals from Aurora and Wilkes sub-glacial basin sediments |
title_full_unstemmed |
Nd bulk isotopes and 40Ar/39Ar ages of individual minerals from Aurora and Wilkes sub-glacial basin sediments |
title_sort |
nd bulk isotopes and 40ar/39ar ages of individual minerals from aurora and wilkes sub-glacial basin sediments |
publisher |
PANGAEA |
publishDate |
2011 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.829630 https://doi.org/10.1594/PANGAEA.829630 |
op_coverage |
MEDIAN LATITUDE: -65.281520 * MEDIAN LONGITUDE: 128.668997 * SOUTH-BOUND LATITUDE: -70.017000 * WEST-BOUND LONGITUDE: 67.218060 * NORTH-BOUND LATITUDE: -59.005000 * EAST-BOUND LONGITUDE: 166.417000 * DATE/TIME START: 1969-01-01T00:00:00 * DATE/TIME END: 2000-02-14T20:30:00 |
long_lat |
ENVELOPE(67.218060,166.417000,-59.005000,-70.017000) |
geographic |
Antarctic East Antarctica Ross Sea Prydz Bay East Antarctic Ice Sheet |
geographic_facet |
Antarctic East Antarctica Ross Sea Prydz Bay East Antarctic Ice Sheet |
genre |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet Iceberg* Prydz Bay Ross Sea |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet Iceberg* Prydz Bay Ross Sea |
op_source |
Supplement to: Pierce, Elizabeth L; Williams, Trevor J; van de Flierdt, Tina; Hemming, Sidney R; Goldstein, Steven L; Brachfeld, Stefanie A (2011): Characterizing the sediment provenance of East Antarctica's weak underbelly: The Aurora and Wilkes sub-glacial basins. Paleoceanography, 26(4), PA4217, https://doi.org/10.1029/2011PA002127 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.829630 https://doi.org/10.1594/PANGAEA.829630 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1594/PANGAEA.82963010.1029/2011PA002127 |
_version_ |
1800738842365394944 |