Investigation of dust bands from blue ice fields in the Lewis Cliff (Beardmore) area, Antarctica: A progress report
Blue ice fields in Antarctica are well known for their high areal meteorite concentrations. The exact type of accumulation model and the age of the ice is still not well known. Dust bands on blue ice fields may help to clarify some of these problems. Dust, which has been isolated from dust band samp...
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Institute of Geochemistry, University of Vienna/National Institute of Polar Research/Department of Geology, University of Pittsburgh/Department of Geology, University of Pittsburgh
1988
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ftnipr:oai:nipr.repo.nii.ac.jp:00004463 2023-05-15T13:49:01+02:00 Investigation of dust bands from blue ice fields in the Lewis Cliff (Beardmore) area, Antarctica: A progress report Christian Koeberl Keizo Yanai William A. Cassidy John W. Schutt 1988-03 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=4463 http://id.nii.ac.jp/1291/00004463/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=4463&item_no=1&attribute_id=18&file_no=1 en eng Institute of Geochemistry, University of Vienna/National Institute of Polar Research/Department of Geology, University of Pittsburgh/Department of Geology, University of Pittsburgh National Institute of Polar Research https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=4463 http://id.nii.ac.jp/1291/00004463/ AA10784627 Proceedings of the NIPR Symposium on Antarctic Meteorites, 1, 291-309(1988-03) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=4463&item_no=1&attribute_id=18&file_no=1 Departmental Bulletin Paper P(論文) 1988 ftnipr 2023-01-28T20:04:07Z Blue ice fields in Antarctica are well known for their high areal meteorite concentrations. The exact type of accumulation model and the age of the ice is still not well known. Dust bands on blue ice fields may help to clarify some of these problems. Dust, which has been isolated from dust band samples from blue ice areas in the Lewis Cliff/Walcott Neve area (Beardmore region), Antarctica, was studied to determine petrographic characteristics and chemical compositions. One sample has an average grain size of around 0.5mm, and is rather different from the others in its abundances of trace elements. The REE pattern and some other trace element ratios of that sample suggest it is a sediment from the local Beacon Supergroup, which has been scooped up from the ground by ice movement. The other five samples which were investigated have very small grain sizes (20μm), and abundant glass shards. Major element data on the glass shards (and some feldspar crystals, which are also present in the dust band samples) allow the conclusion that they have originated from an alkaline volcano. The chemical composition of the glasses is highly variable, some showing basanitic composition, some showing trachytic or peralkaline K-trachytic composition. The silica vs. sum of alkalis plot shows that the Lewis Cliff samples are different from dust collected at the Allan Hills, but that there is a close similarity with volcanic material from The Pleiades, Northern Victoria Land. The trace element chemistry of all volcanic samples show the characteristic volcanic trace elements, like Ta, W, Sb, Th, and the REE, enriched by a considerable factor. The REE patterns exhibit a prominent negative Eu anomaly, which may be explained by mixing basanites (no Eu anomaly, but steep REE patterns) with K-trachytes and peralkaline K-trachytes (very pronounced negative Eu anomaly). The same components are obvious in major element analyses of individual glass shards, thus each dust band is a mixture of at least three different source materials (which, ... Report Antarc* Antarctica Victoria Land National Institute of Polar Research Repository, Japan Allan Hills ENVELOPE(159.667,159.667,-76.717,-76.717) Beardmore ENVELOPE(174.900,174.900,-83.350,-83.350) Lewis Cliff ENVELOPE(161.083,161.083,-84.283,-84.283) Pleiades ENVELOPE(165.533,165.533,-72.700,-72.700) The Pleiades ENVELOPE(165.533,165.533,-72.700,-72.700) Victoria Land Walcott ENVELOPE(-63.317,-63.317,-69.083,-69.083) |
institution |
Open Polar |
collection |
National Institute of Polar Research Repository, Japan |
op_collection_id |
ftnipr |
language |
English |
description |
Blue ice fields in Antarctica are well known for their high areal meteorite concentrations. The exact type of accumulation model and the age of the ice is still not well known. Dust bands on blue ice fields may help to clarify some of these problems. Dust, which has been isolated from dust band samples from blue ice areas in the Lewis Cliff/Walcott Neve area (Beardmore region), Antarctica, was studied to determine petrographic characteristics and chemical compositions. One sample has an average grain size of around 0.5mm, and is rather different from the others in its abundances of trace elements. The REE pattern and some other trace element ratios of that sample suggest it is a sediment from the local Beacon Supergroup, which has been scooped up from the ground by ice movement. The other five samples which were investigated have very small grain sizes (20μm), and abundant glass shards. Major element data on the glass shards (and some feldspar crystals, which are also present in the dust band samples) allow the conclusion that they have originated from an alkaline volcano. The chemical composition of the glasses is highly variable, some showing basanitic composition, some showing trachytic or peralkaline K-trachytic composition. The silica vs. sum of alkalis plot shows that the Lewis Cliff samples are different from dust collected at the Allan Hills, but that there is a close similarity with volcanic material from The Pleiades, Northern Victoria Land. The trace element chemistry of all volcanic samples show the characteristic volcanic trace elements, like Ta, W, Sb, Th, and the REE, enriched by a considerable factor. The REE patterns exhibit a prominent negative Eu anomaly, which may be explained by mixing basanites (no Eu anomaly, but steep REE patterns) with K-trachytes and peralkaline K-trachytes (very pronounced negative Eu anomaly). The same components are obvious in major element analyses of individual glass shards, thus each dust band is a mixture of at least three different source materials (which, ... |
format |
Report |
author |
Christian Koeberl Keizo Yanai William A. Cassidy John W. Schutt |
spellingShingle |
Christian Koeberl Keizo Yanai William A. Cassidy John W. Schutt Investigation of dust bands from blue ice fields in the Lewis Cliff (Beardmore) area, Antarctica: A progress report |
author_facet |
Christian Koeberl Keizo Yanai William A. Cassidy John W. Schutt |
author_sort |
Christian Koeberl |
title |
Investigation of dust bands from blue ice fields in the Lewis Cliff (Beardmore) area, Antarctica: A progress report |
title_short |
Investigation of dust bands from blue ice fields in the Lewis Cliff (Beardmore) area, Antarctica: A progress report |
title_full |
Investigation of dust bands from blue ice fields in the Lewis Cliff (Beardmore) area, Antarctica: A progress report |
title_fullStr |
Investigation of dust bands from blue ice fields in the Lewis Cliff (Beardmore) area, Antarctica: A progress report |
title_full_unstemmed |
Investigation of dust bands from blue ice fields in the Lewis Cliff (Beardmore) area, Antarctica: A progress report |
title_sort |
investigation of dust bands from blue ice fields in the lewis cliff (beardmore) area, antarctica: a progress report |
publisher |
Institute of Geochemistry, University of Vienna/National Institute of Polar Research/Department of Geology, University of Pittsburgh/Department of Geology, University of Pittsburgh |
publishDate |
1988 |
url |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=4463 http://id.nii.ac.jp/1291/00004463/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=4463&item_no=1&attribute_id=18&file_no=1 |
long_lat |
ENVELOPE(159.667,159.667,-76.717,-76.717) ENVELOPE(174.900,174.900,-83.350,-83.350) ENVELOPE(161.083,161.083,-84.283,-84.283) ENVELOPE(165.533,165.533,-72.700,-72.700) ENVELOPE(165.533,165.533,-72.700,-72.700) ENVELOPE(-63.317,-63.317,-69.083,-69.083) |
geographic |
Allan Hills Beardmore Lewis Cliff Pleiades The Pleiades Victoria Land Walcott |
geographic_facet |
Allan Hills Beardmore Lewis Cliff Pleiades The Pleiades Victoria Land Walcott |
genre |
Antarc* Antarctica Victoria Land |
genre_facet |
Antarc* Antarctica Victoria Land |
op_relation |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=4463 http://id.nii.ac.jp/1291/00004463/ AA10784627 Proceedings of the NIPR Symposium on Antarctic Meteorites, 1, 291-309(1988-03) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=4463&item_no=1&attribute_id=18&file_no=1 |
_version_ |
1766250470337150976 |