EVIDENCE OF HIGH COSMIC DUST CONCENTRATIONS IN LATE PLEISTOCENE POLAR ICE (20,000–14,000 YEARS BP)
Dust filtered from the lower portion of the Camp Century ice core (77°10'N, 61°08'W) has been analyzed for the presence of the cosmic dust indicators iridium and nickel using the neutron activation analysis technique. This study was carried out to test the hypothesis that the climatic chan...
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crwiley:10.1111/j.1945-5100.1985.tb00050.x 2023-12-03T10:24:15+01:00 EVIDENCE OF HIGH COSMIC DUST CONCENTRATIONS IN LATE PLEISTOCENE POLAR ICE (20,000–14,000 YEARS BP) LaViolette, Paul A. 1985 http://dx.doi.org/10.1111/j.1945-5100.1985.tb00050.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1945-5100.1985.tb00050.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1945-5100.1985.tb00050.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Meteoritics volume 20, issue 3, page 545-558 ISSN 0026-1114 General Earth and Planetary Sciences General Environmental Science journal-article 1985 crwiley https://doi.org/10.1111/j.1945-5100.1985.tb00050.x 2023-11-09T13:35:26Z Dust filtered from the lower portion of the Camp Century ice core (77°10'N, 61°08'W) has been analyzed for the presence of the cosmic dust indicators iridium and nickel using the neutron activation analysis technique. This study was carried out to test the hypothesis that the climatic change toward the end of the Last Ice Age was triggered by an incursion of nebular material into the Solar System. The analytical results are consistent with this hypothesis. Concentrations of Ir and Ni in the ice were one to two orders of magnitude higher during the latter portion of the Last Ice Age (19,700‐14,200 years BP) as compared with current levels. Ir and Ni levels in 6 out of 8 samples suggest a total cosmic dust influx rate of about 0.5−3 times 10 7 tons/yr to the Earth's surface as compared with about 1−7 x× 10 5 tons/yr for the current influx. Elemental concentrations in 6 of the 8 dust samples ranged from 6− 96 ppb for Ir and < 60 to 3200 ppm for Ni. It is concluded that a major fraction of this invading dust would have been of submicron size in which case the concentration of light scattering particles would have been sufficient to significantly alter the light transmission properties of the Solar System and substantially affect the Earth's climate. These results mark the first time that cosmic dust deposition rates have been estimated for prehistoric times using the polar ice record. Article in Journal/Newspaper ice core Wiley Online Library (via Crossref) Meteoritics 20 3 545 558 |
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Open Polar |
collection |
Wiley Online Library (via Crossref) |
op_collection_id |
crwiley |
language |
English |
topic |
General Earth and Planetary Sciences General Environmental Science |
spellingShingle |
General Earth and Planetary Sciences General Environmental Science LaViolette, Paul A. EVIDENCE OF HIGH COSMIC DUST CONCENTRATIONS IN LATE PLEISTOCENE POLAR ICE (20,000–14,000 YEARS BP) |
topic_facet |
General Earth and Planetary Sciences General Environmental Science |
description |
Dust filtered from the lower portion of the Camp Century ice core (77°10'N, 61°08'W) has been analyzed for the presence of the cosmic dust indicators iridium and nickel using the neutron activation analysis technique. This study was carried out to test the hypothesis that the climatic change toward the end of the Last Ice Age was triggered by an incursion of nebular material into the Solar System. The analytical results are consistent with this hypothesis. Concentrations of Ir and Ni in the ice were one to two orders of magnitude higher during the latter portion of the Last Ice Age (19,700‐14,200 years BP) as compared with current levels. Ir and Ni levels in 6 out of 8 samples suggest a total cosmic dust influx rate of about 0.5−3 times 10 7 tons/yr to the Earth's surface as compared with about 1−7 x× 10 5 tons/yr for the current influx. Elemental concentrations in 6 of the 8 dust samples ranged from 6− 96 ppb for Ir and < 60 to 3200 ppm for Ni. It is concluded that a major fraction of this invading dust would have been of submicron size in which case the concentration of light scattering particles would have been sufficient to significantly alter the light transmission properties of the Solar System and substantially affect the Earth's climate. These results mark the first time that cosmic dust deposition rates have been estimated for prehistoric times using the polar ice record. |
format |
Article in Journal/Newspaper |
author |
LaViolette, Paul A. |
author_facet |
LaViolette, Paul A. |
author_sort |
LaViolette, Paul A. |
title |
EVIDENCE OF HIGH COSMIC DUST CONCENTRATIONS IN LATE PLEISTOCENE POLAR ICE (20,000–14,000 YEARS BP) |
title_short |
EVIDENCE OF HIGH COSMIC DUST CONCENTRATIONS IN LATE PLEISTOCENE POLAR ICE (20,000–14,000 YEARS BP) |
title_full |
EVIDENCE OF HIGH COSMIC DUST CONCENTRATIONS IN LATE PLEISTOCENE POLAR ICE (20,000–14,000 YEARS BP) |
title_fullStr |
EVIDENCE OF HIGH COSMIC DUST CONCENTRATIONS IN LATE PLEISTOCENE POLAR ICE (20,000–14,000 YEARS BP) |
title_full_unstemmed |
EVIDENCE OF HIGH COSMIC DUST CONCENTRATIONS IN LATE PLEISTOCENE POLAR ICE (20,000–14,000 YEARS BP) |
title_sort |
evidence of high cosmic dust concentrations in late pleistocene polar ice (20,000–14,000 years bp) |
publisher |
Wiley |
publishDate |
1985 |
url |
http://dx.doi.org/10.1111/j.1945-5100.1985.tb00050.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1945-5100.1985.tb00050.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1945-5100.1985.tb00050.x |
genre |
ice core |
genre_facet |
ice core |
op_source |
Meteoritics volume 20, issue 3, page 545-558 ISSN 0026-1114 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1945-5100.1985.tb00050.x |
container_title |
Meteoritics |
container_volume |
20 |
container_issue |
3 |
container_start_page |
545 |
op_container_end_page |
558 |
_version_ |
1784272614817005568 |