Carbonaceous micrometeorites from Antarctica
Abstract— Over 100 000 large interplanetary dust particles in the 50–500 μm size range have been recovered in clean conditions from ∼600 tons of Antarctic melt ice water as both unmelted and partially melted/dehydrated micrometeorites and cosmic spherules. Flux measurements in both the Greenland and...
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crwiley:10.1111/j.1945-5100.1998.tb01665.x 2024-09-15T17:46:24+00:00 Carbonaceous micrometeorites from Antarctica ENGRAND, CÉCILE MAURETTE, MICHEL 1998 http://dx.doi.org/10.1111/j.1945-5100.1998.tb01665.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1945-5100.1998.tb01665.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1945-5100.1998.tb01665.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Meteoritics & Planetary Science volume 33, issue 4, page 565-580 ISSN 1086-9379 1945-5100 journal-article 1998 crwiley https://doi.org/10.1111/j.1945-5100.1998.tb01665.x 2024-08-01T04:21:10Z Abstract— Over 100 000 large interplanetary dust particles in the 50–500 μm size range have been recovered in clean conditions from ∼600 tons of Antarctic melt ice water as both unmelted and partially melted/dehydrated micrometeorites and cosmic spherules. Flux measurements in both the Greenland and Antarctica ice sheets indicate that the micrometeorites deliver to the Earth's surface ∼2000× more extraterrestrial material than brought by meteorites. Mineralogical and chemical studies of Antarctic micrometeorites indicate that they are only related to the relatively rare CM and CR carbonaceous chondrite groups, being mostly chondritic carbonaceous objects composed of highly unequilibrated assemblages of anhydrous and hydrous minerals. However, there are also marked differences between these two families of solar system objects, including higher C/O ratios and a very marked depletion of chondrules in micrometeorite matter; hence, they are “chondrites‐without‐chondrules.” Thus, the parent meteoroids of micrometeorites represent a dominant and new population of solar system objects, probably formed in the outer solar system and delivered to the inner solar system by the most appropriate vehicles, comets. One of the major purposes of this paper is to discuss applications of micrometeorite studies that have been previously presented to exobiologists but deal with the synthesis of prebiotic molecules on the early Earth, and more recently, with the early history of the solar system. Article in Journal/Newspaper Antarc* Antarctic Antarctica Greenland Wiley Online Library Meteoritics & Planetary Science 33 4 565 580 |
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Wiley Online Library |
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English |
description |
Abstract— Over 100 000 large interplanetary dust particles in the 50–500 μm size range have been recovered in clean conditions from ∼600 tons of Antarctic melt ice water as both unmelted and partially melted/dehydrated micrometeorites and cosmic spherules. Flux measurements in both the Greenland and Antarctica ice sheets indicate that the micrometeorites deliver to the Earth's surface ∼2000× more extraterrestrial material than brought by meteorites. Mineralogical and chemical studies of Antarctic micrometeorites indicate that they are only related to the relatively rare CM and CR carbonaceous chondrite groups, being mostly chondritic carbonaceous objects composed of highly unequilibrated assemblages of anhydrous and hydrous minerals. However, there are also marked differences between these two families of solar system objects, including higher C/O ratios and a very marked depletion of chondrules in micrometeorite matter; hence, they are “chondrites‐without‐chondrules.” Thus, the parent meteoroids of micrometeorites represent a dominant and new population of solar system objects, probably formed in the outer solar system and delivered to the inner solar system by the most appropriate vehicles, comets. One of the major purposes of this paper is to discuss applications of micrometeorite studies that have been previously presented to exobiologists but deal with the synthesis of prebiotic molecules on the early Earth, and more recently, with the early history of the solar system. |
format |
Article in Journal/Newspaper |
author |
ENGRAND, CÉCILE MAURETTE, MICHEL |
spellingShingle |
ENGRAND, CÉCILE MAURETTE, MICHEL Carbonaceous micrometeorites from Antarctica |
author_facet |
ENGRAND, CÉCILE MAURETTE, MICHEL |
author_sort |
ENGRAND, CÉCILE |
title |
Carbonaceous micrometeorites from Antarctica |
title_short |
Carbonaceous micrometeorites from Antarctica |
title_full |
Carbonaceous micrometeorites from Antarctica |
title_fullStr |
Carbonaceous micrometeorites from Antarctica |
title_full_unstemmed |
Carbonaceous micrometeorites from Antarctica |
title_sort |
carbonaceous micrometeorites from antarctica |
publisher |
Wiley |
publishDate |
1998 |
url |
http://dx.doi.org/10.1111/j.1945-5100.1998.tb01665.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1945-5100.1998.tb01665.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1945-5100.1998.tb01665.x |
genre |
Antarc* Antarctic Antarctica Greenland |
genre_facet |
Antarc* Antarctic Antarctica Greenland |
op_source |
Meteoritics & Planetary Science volume 33, issue 4, page 565-580 ISSN 1086-9379 1945-5100 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1945-5100.1998.tb01665.x |
container_title |
Meteoritics & Planetary Science |
container_volume |
33 |
container_issue |
4 |
container_start_page |
565 |
op_container_end_page |
580 |
_version_ |
1810494503471022080 |