A new variant of saponite‐rich micrometeorites recovered from recent Antarctic snowfall
Abstract– Eight saponite‐rich micrometeorites with very similar mineralogy were found from the recent surface snow in Antarctica. They might have come to Earth as a larger meteoroid and broke up into pieces on Earth, because they were recovered from the same layer and the same location of the snow....
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crwiley:10.1111/j.1945-5100.2010.01019.x 2024-06-23T07:47:25+00:00 A new variant of saponite‐rich micrometeorites recovered from recent Antarctic snowfall SAKAMOTO, Kanako NAKAMURA, Tomoki NOGUCHI, Takaaki TSUCHIYAMA, Akira 2010 http://dx.doi.org/10.1111/j.1945-5100.2010.01019.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1945-5100.2010.01019.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1945-5100.2010.01019.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Meteoritics & Planetary Science volume 45, issue 2, page 220-237 ISSN 1086-9379 1945-5100 journal-article 2010 crwiley https://doi.org/10.1111/j.1945-5100.2010.01019.x 2024-06-06T04:19:34Z Abstract– Eight saponite‐rich micrometeorites with very similar mineralogy were found from the recent surface snow in Antarctica. They might have come to Earth as a larger meteoroid and broke up into pieces on Earth, because they were recovered from the same layer and the same location of the snow. Synchrotron X‐ray diffraction (XRD) analysis indicates that saponite, Mg‐Fe carbonate, and pyrrhotite are major phases and serpentine, magnetite, and pentlandite are minor phases. Anhydrous silicates are entirely absent from all micrometeorites, suggesting that their parental object has undergone heavy aqueous alteration. Saponite/serpentine ratios are higher than in the Orgueil CI chondrite and are similar to the Tagish Lake carbonaceous chondrite. Transmission electron microscope (TEM) observation indicates that serpentine occupies core regions of fine‐grained saponite, pyrrhotite has a low‐Ni concentration, and Mg‐Fe carbonate shows unique concentric ring structures and has a mean molar Mg/(Mg + Fe) ratio of 0.7. Comparison of the mineralogy to hydrated chondrites and interplanetary dust particles (IDPs) suggests that the micrometeorites are most similar to the carbonate‐poor lithology of the Tagish Lake carbonaceous chondrite and some hydrous IDPs, but they show a carbonate mineralogy dissimilar to any primitive chondritic materials. Therefore, they are a new variant of saponite‐rich micrometeorite extracted from a primitive hydrous asteroid and recently accreted to Antarctica. Article in Journal/Newspaper Antarc* Antarctic Antarctica Tagish Wiley Online Library Antarctic Tagish ENVELOPE(-134.272,-134.272,60.313,60.313) Tagish Lake ENVELOPE(-134.233,-134.233,59.717,59.717) Meteoritics & Planetary Science 45 2 220 237 |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract– Eight saponite‐rich micrometeorites with very similar mineralogy were found from the recent surface snow in Antarctica. They might have come to Earth as a larger meteoroid and broke up into pieces on Earth, because they were recovered from the same layer and the same location of the snow. Synchrotron X‐ray diffraction (XRD) analysis indicates that saponite, Mg‐Fe carbonate, and pyrrhotite are major phases and serpentine, magnetite, and pentlandite are minor phases. Anhydrous silicates are entirely absent from all micrometeorites, suggesting that their parental object has undergone heavy aqueous alteration. Saponite/serpentine ratios are higher than in the Orgueil CI chondrite and are similar to the Tagish Lake carbonaceous chondrite. Transmission electron microscope (TEM) observation indicates that serpentine occupies core regions of fine‐grained saponite, pyrrhotite has a low‐Ni concentration, and Mg‐Fe carbonate shows unique concentric ring structures and has a mean molar Mg/(Mg + Fe) ratio of 0.7. Comparison of the mineralogy to hydrated chondrites and interplanetary dust particles (IDPs) suggests that the micrometeorites are most similar to the carbonate‐poor lithology of the Tagish Lake carbonaceous chondrite and some hydrous IDPs, but they show a carbonate mineralogy dissimilar to any primitive chondritic materials. Therefore, they are a new variant of saponite‐rich micrometeorite extracted from a primitive hydrous asteroid and recently accreted to Antarctica. |
format |
Article in Journal/Newspaper |
author |
SAKAMOTO, Kanako NAKAMURA, Tomoki NOGUCHI, Takaaki TSUCHIYAMA, Akira |
spellingShingle |
SAKAMOTO, Kanako NAKAMURA, Tomoki NOGUCHI, Takaaki TSUCHIYAMA, Akira A new variant of saponite‐rich micrometeorites recovered from recent Antarctic snowfall |
author_facet |
SAKAMOTO, Kanako NAKAMURA, Tomoki NOGUCHI, Takaaki TSUCHIYAMA, Akira |
author_sort |
SAKAMOTO, Kanako |
title |
A new variant of saponite‐rich micrometeorites recovered from recent Antarctic snowfall |
title_short |
A new variant of saponite‐rich micrometeorites recovered from recent Antarctic snowfall |
title_full |
A new variant of saponite‐rich micrometeorites recovered from recent Antarctic snowfall |
title_fullStr |
A new variant of saponite‐rich micrometeorites recovered from recent Antarctic snowfall |
title_full_unstemmed |
A new variant of saponite‐rich micrometeorites recovered from recent Antarctic snowfall |
title_sort |
new variant of saponite‐rich micrometeorites recovered from recent antarctic snowfall |
publisher |
Wiley |
publishDate |
2010 |
url |
http://dx.doi.org/10.1111/j.1945-5100.2010.01019.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1945-5100.2010.01019.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1945-5100.2010.01019.x |
long_lat |
ENVELOPE(-134.272,-134.272,60.313,60.313) ENVELOPE(-134.233,-134.233,59.717,59.717) |
geographic |
Antarctic Tagish Tagish Lake |
geographic_facet |
Antarctic Tagish Tagish Lake |
genre |
Antarc* Antarctic Antarctica Tagish |
genre_facet |
Antarc* Antarctic Antarctica Tagish |
op_source |
Meteoritics & Planetary Science volume 45, issue 2, page 220-237 ISSN 1086-9379 1945-5100 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1945-5100.2010.01019.x |
container_title |
Meteoritics & Planetary Science |
container_volume |
45 |
container_issue |
2 |
container_start_page |
220 |
op_container_end_page |
237 |
_version_ |
1802651524917100544 |