Evidence for the presence of chondrule‐ and CAI‐derived material in an isotopically anomalous Antarctic micrometeorite
Abstract We report the discovery of a unique, refractory phase‐bearing micrometeorite (WF1202A‐001) from the Sør Rondane Mountains, East Antarctica. A silicate‐rich cosmic spherule (~400 µm) displays a microporphyritic texture containing Ca‐Al‐rich inclusion (CAI)‐derived material (~5–10 area%), inc...
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crwiley:10.1111/maps.13599 2024-06-23T07:47:08+00:00 Evidence for the presence of chondrule‐ and CAI‐derived material in an isotopically anomalous Antarctic micrometeorite Soens, Bastien Suttle, Martin D. Maeda, Ryoga Vanhaecke, Frank Yamaguchi, Akira Van Ginneken, Matthias Debaille, Vinciane Claeys, Philippe Goderis, Steven European Research Council Vrije Universiteit Brussel Universiteit Gent Belgian Federal Science Policy Office Fonds Wetenschappelijk Onderzoek Science and Technology Facilities Council 2020 http://dx.doi.org/10.1111/maps.13599 https://onlinelibrary.wiley.com/doi/pdf/10.1111/maps.13599 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/maps.13599 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Meteoritics & Planetary Science volume 55, issue 12, page 2703-2726 ISSN 1086-9379 1945-5100 journal-article 2020 crwiley https://doi.org/10.1111/maps.13599 2024-06-11T04:44:14Z Abstract We report the discovery of a unique, refractory phase‐bearing micrometeorite (WF1202A‐001) from the Sør Rondane Mountains, East Antarctica. A silicate‐rich cosmic spherule (~400 µm) displays a microporphyritic texture containing Ca‐Al‐rich inclusion (CAI)‐derived material (~5–10 area%), including high‐Mg forsterite (Fo 98‐99 ) and enstatite (En 98‐99 , Wo 0‐1 ). The micrometeorite also hosts a spherical inclusion (~209 µm), reminiscent of chondrules, displaying a barred olivine texture. Oxygen isotopic compositions of the micrometeorite groundmass (δ 17 O = –3.46‰, δ 18 O = 10.43‰, ∆ 17 O = –1.96‰) are consistent with a carbonaceous chondrite precursor body. Yet, a relict forsterite grain is characterized by δ 17 O = –45.8‰, δ 18 O = –43.7‰, ∆ 17 O = –23.1‰, compatible with CAIs. In contrast, a relict low‐Ca pyroxene grain (δ 17 O = –4.96‰, δ 18 O = –4.32‰, ∆ 17 O = –2.71‰) presumably represents a first‐generation silicate grain that accreted 18 O‐rich gas or dust in a transient melting scenario. The spherical inclusion displays anomalous oxygen isotope ratios (δ 17 O = –0.98‰, δ 18 O = –2.16‰, ∆ 17 O = 0.15‰), comparable to anhydrous interplanetary dust particles (IDPs) and fragments from Comet 81P/Wild2. Based on its major element geochemistry, the chondrule size, and oxygen isotope systematics, micrometeorite WF1202A‐001 likely sampled a carbonaceous chondrite parent body similar to, but distinct from CM, CO, or CV chondrites. This observation may suggest that some carbonaceous chondrite bodies can be linked to comets. The reconstructed atmospheric entry parameters of micrometeorite WF1202A‐001 suggest that the precursor particle originated from a low‐inclination, low‐eccentricity source region, most likely either the main belt asteroids or Jupiter family comets (JFCs). Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Wiley Online Library Antarctic East Antarctica Jupiter ENVELOPE(101.133,101.133,-66.117,-66.117) Sør Rondane Mountains ENVELOPE(25.000,25.000,-72.000,-72.000) Sør-Rondane ENVELOPE(25.000,25.000,-72.000,-72.000) Meteoritics & Planetary Science 55 12 2703 2726 |
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Wiley Online Library |
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English |
description |
Abstract We report the discovery of a unique, refractory phase‐bearing micrometeorite (WF1202A‐001) from the Sør Rondane Mountains, East Antarctica. A silicate‐rich cosmic spherule (~400 µm) displays a microporphyritic texture containing Ca‐Al‐rich inclusion (CAI)‐derived material (~5–10 area%), including high‐Mg forsterite (Fo 98‐99 ) and enstatite (En 98‐99 , Wo 0‐1 ). The micrometeorite also hosts a spherical inclusion (~209 µm), reminiscent of chondrules, displaying a barred olivine texture. Oxygen isotopic compositions of the micrometeorite groundmass (δ 17 O = –3.46‰, δ 18 O = 10.43‰, ∆ 17 O = –1.96‰) are consistent with a carbonaceous chondrite precursor body. Yet, a relict forsterite grain is characterized by δ 17 O = –45.8‰, δ 18 O = –43.7‰, ∆ 17 O = –23.1‰, compatible with CAIs. In contrast, a relict low‐Ca pyroxene grain (δ 17 O = –4.96‰, δ 18 O = –4.32‰, ∆ 17 O = –2.71‰) presumably represents a first‐generation silicate grain that accreted 18 O‐rich gas or dust in a transient melting scenario. The spherical inclusion displays anomalous oxygen isotope ratios (δ 17 O = –0.98‰, δ 18 O = –2.16‰, ∆ 17 O = 0.15‰), comparable to anhydrous interplanetary dust particles (IDPs) and fragments from Comet 81P/Wild2. Based on its major element geochemistry, the chondrule size, and oxygen isotope systematics, micrometeorite WF1202A‐001 likely sampled a carbonaceous chondrite parent body similar to, but distinct from CM, CO, or CV chondrites. This observation may suggest that some carbonaceous chondrite bodies can be linked to comets. The reconstructed atmospheric entry parameters of micrometeorite WF1202A‐001 suggest that the precursor particle originated from a low‐inclination, low‐eccentricity source region, most likely either the main belt asteroids or Jupiter family comets (JFCs). |
author2 |
European Research Council Vrije Universiteit Brussel Universiteit Gent Belgian Federal Science Policy Office Fonds Wetenschappelijk Onderzoek Science and Technology Facilities Council |
format |
Article in Journal/Newspaper |
author |
Soens, Bastien Suttle, Martin D. Maeda, Ryoga Vanhaecke, Frank Yamaguchi, Akira Van Ginneken, Matthias Debaille, Vinciane Claeys, Philippe Goderis, Steven |
spellingShingle |
Soens, Bastien Suttle, Martin D. Maeda, Ryoga Vanhaecke, Frank Yamaguchi, Akira Van Ginneken, Matthias Debaille, Vinciane Claeys, Philippe Goderis, Steven Evidence for the presence of chondrule‐ and CAI‐derived material in an isotopically anomalous Antarctic micrometeorite |
author_facet |
Soens, Bastien Suttle, Martin D. Maeda, Ryoga Vanhaecke, Frank Yamaguchi, Akira Van Ginneken, Matthias Debaille, Vinciane Claeys, Philippe Goderis, Steven |
author_sort |
Soens, Bastien |
title |
Evidence for the presence of chondrule‐ and CAI‐derived material in an isotopically anomalous Antarctic micrometeorite |
title_short |
Evidence for the presence of chondrule‐ and CAI‐derived material in an isotopically anomalous Antarctic micrometeorite |
title_full |
Evidence for the presence of chondrule‐ and CAI‐derived material in an isotopically anomalous Antarctic micrometeorite |
title_fullStr |
Evidence for the presence of chondrule‐ and CAI‐derived material in an isotopically anomalous Antarctic micrometeorite |
title_full_unstemmed |
Evidence for the presence of chondrule‐ and CAI‐derived material in an isotopically anomalous Antarctic micrometeorite |
title_sort |
evidence for the presence of chondrule‐ and cai‐derived material in an isotopically anomalous antarctic micrometeorite |
publisher |
Wiley |
publishDate |
2020 |
url |
http://dx.doi.org/10.1111/maps.13599 https://onlinelibrary.wiley.com/doi/pdf/10.1111/maps.13599 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/maps.13599 |
long_lat |
ENVELOPE(101.133,101.133,-66.117,-66.117) ENVELOPE(25.000,25.000,-72.000,-72.000) ENVELOPE(25.000,25.000,-72.000,-72.000) |
geographic |
Antarctic East Antarctica Jupiter Sør Rondane Mountains Sør-Rondane |
geographic_facet |
Antarctic East Antarctica Jupiter Sør Rondane Mountains Sør-Rondane |
genre |
Antarc* Antarctic Antarctica East Antarctica |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica |
op_source |
Meteoritics & Planetary Science volume 55, issue 12, page 2703-2726 ISSN 1086-9379 1945-5100 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/maps.13599 |
container_title |
Meteoritics & Planetary Science |
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55 |
container_issue |
12 |
container_start_page |
2703 |
op_container_end_page |
2726 |
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1802651227804139520 |