Characteristics and mass distribution of extraterrestrial dust from the Greenland ice cap
International audience Extraterrestrial grains with sizes ≳50 µm can now be extracted in large numbers from terrestrial sediments but their origins are still uncertain. At least 99% of these grains have been thought to be spherules1,2 resulting from the melting of their parent bodies in the atmosphe...
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ftceafr:oai:HAL:hal-03548922v1 2024-09-15T18:08:58+00:00 Characteristics and mass distribution of extraterrestrial dust from the Greenland ice cap Maurette, M. Jéhanno, C. Robin, E. Hammer, C. Laboratoire Rene Bernas Université Paris-Sud - Paris 11 (UP11) Centre des Faibles Radioactivités Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS) University of Copenhagen = Københavns Universitet (UCPH) 1987-08 https://hal.science/hal-03548922 https://doi.org/10.1038/328699a0 en eng HAL CCSD Nature Publishing Group info:eu-repo/semantics/altIdentifier/doi/10.1038/328699a0 hal-03548922 https://hal.science/hal-03548922 doi:10.1038/328699a0 ISSN: 0028-0836 EISSN: 1476-4687 Nature https://hal.science/hal-03548922 Nature, 1987, 328 (6132), pp.699-702. ⟨10.1038/328699a0⟩ [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment info:eu-repo/semantics/article Journal articles 1987 ftceafr https://doi.org/10.1038/328699a0 2024-07-22T13:12:47Z International audience Extraterrestrial grains with sizes ≳50 µm can now be extracted in large numbers from terrestrial sediments but their origins are still uncertain. At least 99% of these grains have been thought to be spherules1,2 resulting from the melting of their parent bodies in the atmosphere, which destroyed their mineralogical composition. Here we present analyses of extraterrestrial grains extracted from six samples of cryoconite3 (black dust) collected from the melt zone of the Greenland ice cap. In addition to families of grains never reported before, we have found a surprisingly high abundance of unmelted chondritic fragments, in which the nonvolatile component of the parent bodies has been well preserved. The mass distribution of the grains is very similar to that of the micrometeorite flux at 1 AU (ref. 4), indicating that most of the grains are micrometeorites, and not ablation products of larger meteorites. These results yield new constraints on the ablation of such Greenland micrometeorites, as well as guidelines for using them as glaciological and geological markers. Article in Journal/Newspaper Greenland Ice cap HAL-CEA (Commissariat à l'énergie atomique et aux énergies alternatives) Nature 328 6132 699 702 |
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Open Polar |
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HAL-CEA (Commissariat à l'énergie atomique et aux énergies alternatives) |
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ftceafr |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment |
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[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment Maurette, M. Jéhanno, C. Robin, E. Hammer, C. Characteristics and mass distribution of extraterrestrial dust from the Greenland ice cap |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment |
description |
International audience Extraterrestrial grains with sizes ≳50 µm can now be extracted in large numbers from terrestrial sediments but their origins are still uncertain. At least 99% of these grains have been thought to be spherules1,2 resulting from the melting of their parent bodies in the atmosphere, which destroyed their mineralogical composition. Here we present analyses of extraterrestrial grains extracted from six samples of cryoconite3 (black dust) collected from the melt zone of the Greenland ice cap. In addition to families of grains never reported before, we have found a surprisingly high abundance of unmelted chondritic fragments, in which the nonvolatile component of the parent bodies has been well preserved. The mass distribution of the grains is very similar to that of the micrometeorite flux at 1 AU (ref. 4), indicating that most of the grains are micrometeorites, and not ablation products of larger meteorites. These results yield new constraints on the ablation of such Greenland micrometeorites, as well as guidelines for using them as glaciological and geological markers. |
author2 |
Laboratoire Rene Bernas Université Paris-Sud - Paris 11 (UP11) Centre des Faibles Radioactivités Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS) University of Copenhagen = Københavns Universitet (UCPH) |
format |
Article in Journal/Newspaper |
author |
Maurette, M. Jéhanno, C. Robin, E. Hammer, C. |
author_facet |
Maurette, M. Jéhanno, C. Robin, E. Hammer, C. |
author_sort |
Maurette, M. |
title |
Characteristics and mass distribution of extraterrestrial dust from the Greenland ice cap |
title_short |
Characteristics and mass distribution of extraterrestrial dust from the Greenland ice cap |
title_full |
Characteristics and mass distribution of extraterrestrial dust from the Greenland ice cap |
title_fullStr |
Characteristics and mass distribution of extraterrestrial dust from the Greenland ice cap |
title_full_unstemmed |
Characteristics and mass distribution of extraterrestrial dust from the Greenland ice cap |
title_sort |
characteristics and mass distribution of extraterrestrial dust from the greenland ice cap |
publisher |
HAL CCSD |
publishDate |
1987 |
url |
https://hal.science/hal-03548922 https://doi.org/10.1038/328699a0 |
genre |
Greenland Ice cap |
genre_facet |
Greenland Ice cap |
op_source |
ISSN: 0028-0836 EISSN: 1476-4687 Nature https://hal.science/hal-03548922 Nature, 1987, 328 (6132), pp.699-702. ⟨10.1038/328699a0⟩ |
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info:eu-repo/semantics/altIdentifier/doi/10.1038/328699a0 hal-03548922 https://hal.science/hal-03548922 doi:10.1038/328699a0 |
op_doi |
https://doi.org/10.1038/328699a0 |
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Nature |
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328 |
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6132 |
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699 |
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702 |
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1810446348376342528 |