Lewis Cliff 86360: An Antarctic L‐chondrite with a terrestrial age of 2.35 million years
Abstract— We measured the concentrations of the cosmogenic radionuclides 10 Be (half‐life = 1.51 × 10 6 a), 26 Al (7.05 × 10 5 a) and 36 Cl (3.01 × 10 5 a) in Lewis Cliff (LEW) 86360, an L‐chondrite from the Lewis Cliff stranding area, East Antarctica. In addition, the concentrations and isotopic co...
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crwiley:10.1111/j.1945-5100.1997.tb01568.x 2024-09-15T17:44:59+00:00 Lewis Cliff 86360: An Antarctic L‐chondrite with a terrestrial age of 2.35 million years WELTEN, K. C. ALDERLIESTEN, C. VAN DER BORG, K. LINDNER, L. LOEKEN, T. SCHULTZ, L. 1997 http://dx.doi.org/10.1111/j.1945-5100.1997.tb01568.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1945-5100.1997.tb01568.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1945-5100.1997.tb01568.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Meteoritics & Planetary Science volume 32, issue 6, page 775-780 ISSN 1086-9379 1945-5100 journal-article 1997 crwiley https://doi.org/10.1111/j.1945-5100.1997.tb01568.x 2024-08-20T04:15:56Z Abstract— We measured the concentrations of the cosmogenic radionuclides 10 Be (half‐life = 1.51 × 10 6 a), 26 Al (7.05 × 10 5 a) and 36 Cl (3.01 × 10 5 a) in Lewis Cliff (LEW) 86360, an L‐chondrite from the Lewis Cliff stranding area, East Antarctica. In addition, the concentrations and isotopic compositions of He, Ne and Ar were measured. The combined results yield a terrestrial age of 2.35 ± 0.15 Ma. Only one other stony meteorite with a similar terrestrial age (∼2 Ma) is known from the Allan Hills stranding area (ALH 88019), whereas all previously dated stony meteorites from Antarctica are younger than 1 Ma. We argue that LEW 86360 spent most of its terrestrial residence time deep inside the ice, near the base of the glacier, where ice flow rates are much lower than at the surface. The terrestrial ages of LEW 86360 and ALH 88019 are consistent with existing hypotheses concerning the stability and persistence of the East Antarctic ice sheet. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Ice Sheet Wiley Online Library Meteoritics & Planetary Science 32 6 775 780 |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract— We measured the concentrations of the cosmogenic radionuclides 10 Be (half‐life = 1.51 × 10 6 a), 26 Al (7.05 × 10 5 a) and 36 Cl (3.01 × 10 5 a) in Lewis Cliff (LEW) 86360, an L‐chondrite from the Lewis Cliff stranding area, East Antarctica. In addition, the concentrations and isotopic compositions of He, Ne and Ar were measured. The combined results yield a terrestrial age of 2.35 ± 0.15 Ma. Only one other stony meteorite with a similar terrestrial age (∼2 Ma) is known from the Allan Hills stranding area (ALH 88019), whereas all previously dated stony meteorites from Antarctica are younger than 1 Ma. We argue that LEW 86360 spent most of its terrestrial residence time deep inside the ice, near the base of the glacier, where ice flow rates are much lower than at the surface. The terrestrial ages of LEW 86360 and ALH 88019 are consistent with existing hypotheses concerning the stability and persistence of the East Antarctic ice sheet. |
format |
Article in Journal/Newspaper |
author |
WELTEN, K. C. ALDERLIESTEN, C. VAN DER BORG, K. LINDNER, L. LOEKEN, T. SCHULTZ, L. |
spellingShingle |
WELTEN, K. C. ALDERLIESTEN, C. VAN DER BORG, K. LINDNER, L. LOEKEN, T. SCHULTZ, L. Lewis Cliff 86360: An Antarctic L‐chondrite with a terrestrial age of 2.35 million years |
author_facet |
WELTEN, K. C. ALDERLIESTEN, C. VAN DER BORG, K. LINDNER, L. LOEKEN, T. SCHULTZ, L. |
author_sort |
WELTEN, K. C. |
title |
Lewis Cliff 86360: An Antarctic L‐chondrite with a terrestrial age of 2.35 million years |
title_short |
Lewis Cliff 86360: An Antarctic L‐chondrite with a terrestrial age of 2.35 million years |
title_full |
Lewis Cliff 86360: An Antarctic L‐chondrite with a terrestrial age of 2.35 million years |
title_fullStr |
Lewis Cliff 86360: An Antarctic L‐chondrite with a terrestrial age of 2.35 million years |
title_full_unstemmed |
Lewis Cliff 86360: An Antarctic L‐chondrite with a terrestrial age of 2.35 million years |
title_sort |
lewis cliff 86360: an antarctic l‐chondrite with a terrestrial age of 2.35 million years |
publisher |
Wiley |
publishDate |
1997 |
url |
http://dx.doi.org/10.1111/j.1945-5100.1997.tb01568.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1945-5100.1997.tb01568.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1945-5100.1997.tb01568.x |
genre |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet |
op_source |
Meteoritics & Planetary Science volume 32, issue 6, page 775-780 ISSN 1086-9379 1945-5100 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1945-5100.1997.tb01568.x |
container_title |
Meteoritics & Planetary Science |
container_volume |
32 |
container_issue |
6 |
container_start_page |
775 |
op_container_end_page |
780 |
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1810492683022499840 |