Fast-growing till over ancient ice in Beacon Valley, Antarctica
We analyze published cosmogenic 3He depth profiles through the till that covers relict glacier ice in Beacon Valley, Antarctica, in order to derive rigorous constraints on the till thickness history, and on the amount and rate of ice loss by sublimation. The till is a residue of debris-laden ice tha...
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Language: | English |
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The Geological Society of America
2005
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Online Access: | https://eprints.whiterose.ac.uk/92152/ https://eprints.whiterose.ac.uk/92152/1/G21064AR_merged.pdf https://doi.org/10.1130/G21064.1 |
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ftleedsuniv:oai:eprints.whiterose.ac.uk:92152 2023-05-15T13:55:00+02:00 Fast-growing till over ancient ice in Beacon Valley, Antarctica Ng, F. Hallet, B. Sletten, R. Stone, J.O. 2005-02 text https://eprints.whiterose.ac.uk/92152/ https://eprints.whiterose.ac.uk/92152/1/G21064AR_merged.pdf https://doi.org/10.1130/G21064.1 en eng The Geological Society of America https://eprints.whiterose.ac.uk/92152/1/G21064AR_merged.pdf Ng, F., Hallet, B., Sletten, R. et al. (1 more author) (2005) Fast-growing till over ancient ice in Beacon Valley, Antarctica. Geology, 33 (2). 121 - 124. ISSN 0091-7613 Article PeerReviewed 2005 ftleedsuniv https://doi.org/10.1130/G21064.1 2023-01-30T21:36:56Z We analyze published cosmogenic 3He depth profiles through the till that covers relict glacier ice in Beacon Valley, Antarctica, in order to derive rigorous constraints on the till thickness history, and on the amount and rate of ice loss by sublimation. The till is a residue of debris-laden ice that sublimed. The 3He profiles show that the lower 80% of the till formed in the past 310–43 k.y. under sublimation rates averaging >7 m·m.y.−1 (meters per million years). Such rapid recent growth of the till contradicts previous interpretations that it is older than 8.1 Ma at an adjacent site, where it encloses volcanic ash of this age. We question whether the ash provides a valid age constraint for the ice. Cosmogenic nuclide analysis of the till where the ash was collected for dating should resolve this question. Article in Journal/Newspaper Antarc* Antarctica White Rose Research Online (Universities of Leeds, Sheffield & York) Beacon Valley ENVELOPE(160.650,160.650,-77.817,-77.817) Geology 33 2 121 |
institution |
Open Polar |
collection |
White Rose Research Online (Universities of Leeds, Sheffield & York) |
op_collection_id |
ftleedsuniv |
language |
English |
description |
We analyze published cosmogenic 3He depth profiles through the till that covers relict glacier ice in Beacon Valley, Antarctica, in order to derive rigorous constraints on the till thickness history, and on the amount and rate of ice loss by sublimation. The till is a residue of debris-laden ice that sublimed. The 3He profiles show that the lower 80% of the till formed in the past 310–43 k.y. under sublimation rates averaging >7 m·m.y.−1 (meters per million years). Such rapid recent growth of the till contradicts previous interpretations that it is older than 8.1 Ma at an adjacent site, where it encloses volcanic ash of this age. We question whether the ash provides a valid age constraint for the ice. Cosmogenic nuclide analysis of the till where the ash was collected for dating should resolve this question. |
format |
Article in Journal/Newspaper |
author |
Ng, F. Hallet, B. Sletten, R. Stone, J.O. |
spellingShingle |
Ng, F. Hallet, B. Sletten, R. Stone, J.O. Fast-growing till over ancient ice in Beacon Valley, Antarctica |
author_facet |
Ng, F. Hallet, B. Sletten, R. Stone, J.O. |
author_sort |
Ng, F. |
title |
Fast-growing till over ancient ice in Beacon Valley, Antarctica |
title_short |
Fast-growing till over ancient ice in Beacon Valley, Antarctica |
title_full |
Fast-growing till over ancient ice in Beacon Valley, Antarctica |
title_fullStr |
Fast-growing till over ancient ice in Beacon Valley, Antarctica |
title_full_unstemmed |
Fast-growing till over ancient ice in Beacon Valley, Antarctica |
title_sort |
fast-growing till over ancient ice in beacon valley, antarctica |
publisher |
The Geological Society of America |
publishDate |
2005 |
url |
https://eprints.whiterose.ac.uk/92152/ https://eprints.whiterose.ac.uk/92152/1/G21064AR_merged.pdf https://doi.org/10.1130/G21064.1 |
long_lat |
ENVELOPE(160.650,160.650,-77.817,-77.817) |
geographic |
Beacon Valley |
geographic_facet |
Beacon Valley |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_relation |
https://eprints.whiterose.ac.uk/92152/1/G21064AR_merged.pdf Ng, F., Hallet, B., Sletten, R. et al. (1 more author) (2005) Fast-growing till over ancient ice in Beacon Valley, Antarctica. Geology, 33 (2). 121 - 124. ISSN 0091-7613 |
op_doi |
https://doi.org/10.1130/G21064.1 |
container_title |
Geology |
container_volume |
33 |
container_issue |
2 |
container_start_page |
121 |
_version_ |
1766261220440014848 |