Cometary dust in Antarctic micrometeorites
Abstract Cometary nuclei consist of aggregates of interstellar dust particles less than ~1 μm in diameter and can produce rocky dust particles as a result of the sublimation of ice as comets enter the inner solar system. Samples of fine-grained particles known as chondritic porous interplanetary dus...
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crcambridgeupr:10.1017/s1743921312016766 2023-05-15T14:13:26+02:00 Cometary dust in Antarctic micrometeorites Imae, Naoya 2012 http://dx.doi.org/10.1017/s1743921312016766 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S1743921312016766 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Proceedings of the International Astronomical Union volume 8, issue S288, page 123-129 ISSN 1743-9213 1743-9221 Astronomy and Astrophysics Space and Planetary Science journal-article 2012 crcambridgeupr https://doi.org/10.1017/s1743921312016766 2022-04-07T08:08:57Z Abstract Cometary nuclei consist of aggregates of interstellar dust particles less than ~1 μm in diameter and can produce rocky dust particles as a result of the sublimation of ice as comets enter the inner solar system. Samples of fine-grained particles known as chondritic porous interplanetary dust particles (CP-IDPs), possibly from comets, have been collected from the Earth's stratosphere. Owing to their fine-grained texture, these particles were previously thought to be condensates formed directly from interstellar gas. However, coarse-grained chondrule-like objects have recently been observed in samples from comet 81P/Wild 2. The chondrule-like objects are chemically distinct from chondrules in meteoritic chondrites, possessing higher MnO contents (0.5 wt%) in olivine and low-Ca pyroxene. In this study, we analyzed AMM samples by secondary electron microscopy and backscattered electron images for textural observations and compositional analysis. We identified thirteen AMMs with characteristics similar to those of the 81P/Wild 2 samples, and believe that recognition of these similarities necessitates reassessment of the existing models of chondrule formation. Article in Journal/Newspaper Antarc* Antarctic Cambridge University Press (via Crossref) Antarctic Proceedings of the International Astronomical Union 8 S288 123 129 |
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Cambridge University Press (via Crossref) |
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crcambridgeupr |
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English |
topic |
Astronomy and Astrophysics Space and Planetary Science |
spellingShingle |
Astronomy and Astrophysics Space and Planetary Science Imae, Naoya Cometary dust in Antarctic micrometeorites |
topic_facet |
Astronomy and Astrophysics Space and Planetary Science |
description |
Abstract Cometary nuclei consist of aggregates of interstellar dust particles less than ~1 μm in diameter and can produce rocky dust particles as a result of the sublimation of ice as comets enter the inner solar system. Samples of fine-grained particles known as chondritic porous interplanetary dust particles (CP-IDPs), possibly from comets, have been collected from the Earth's stratosphere. Owing to their fine-grained texture, these particles were previously thought to be condensates formed directly from interstellar gas. However, coarse-grained chondrule-like objects have recently been observed in samples from comet 81P/Wild 2. The chondrule-like objects are chemically distinct from chondrules in meteoritic chondrites, possessing higher MnO contents (0.5 wt%) in olivine and low-Ca pyroxene. In this study, we analyzed AMM samples by secondary electron microscopy and backscattered electron images for textural observations and compositional analysis. We identified thirteen AMMs with characteristics similar to those of the 81P/Wild 2 samples, and believe that recognition of these similarities necessitates reassessment of the existing models of chondrule formation. |
format |
Article in Journal/Newspaper |
author |
Imae, Naoya |
author_facet |
Imae, Naoya |
author_sort |
Imae, Naoya |
title |
Cometary dust in Antarctic micrometeorites |
title_short |
Cometary dust in Antarctic micrometeorites |
title_full |
Cometary dust in Antarctic micrometeorites |
title_fullStr |
Cometary dust in Antarctic micrometeorites |
title_full_unstemmed |
Cometary dust in Antarctic micrometeorites |
title_sort |
cometary dust in antarctic micrometeorites |
publisher |
Cambridge University Press (CUP) |
publishDate |
2012 |
url |
http://dx.doi.org/10.1017/s1743921312016766 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S1743921312016766 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Proceedings of the International Astronomical Union volume 8, issue S288, page 123-129 ISSN 1743-9213 1743-9221 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s1743921312016766 |
container_title |
Proceedings of the International Astronomical Union |
container_volume |
8 |
container_issue |
S288 |
container_start_page |
123 |
op_container_end_page |
129 |
_version_ |
1766285876940242944 |