The Antarctic achondrite, Grove Mountains 021663: An olivine‐rich winonaite
Abstract– The Grove Mountains (GRV) 021663 meteorite was collected from the Grove Mountains region of Antarctica. The meteorite is composed primarily of olivine (Fa 5.4 ), orthopyroxene (Fs 4.7 Wo 3.0 ), chromian diopside (En 53.6 Fs 2.4 Wo 44 ), troilite, kamacite, and plagioclase (Ab 74.5 Or 4 An...
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crwiley:10.1111/j.1945-5100.2011.01232.x 2024-09-15T17:47:24+00:00 The Antarctic achondrite, Grove Mountains 021663: An olivine‐rich winonaite LI, Shijie WANG, Shijie BAO, Huiming MIAO, Bingkui LIU, Shen COULSON, Ian M. LI, Xiongyao LI, Yang 2011 http://dx.doi.org/10.1111/j.1945-5100.2011.01232.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1945-5100.2011.01232.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1945-5100.2011.01232.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Meteoritics & Planetary Science volume 46, issue 9, page 1329-1344 ISSN 1086-9379 1945-5100 journal-article 2011 crwiley https://doi.org/10.1111/j.1945-5100.2011.01232.x 2024-09-03T04:26:22Z Abstract– The Grove Mountains (GRV) 021663 meteorite was collected from the Grove Mountains region of Antarctica. The meteorite is composed primarily of olivine (Fa 5.4 ), orthopyroxene (Fs 4.7 Wo 3.0 ), chromian diopside (En 53.6 Fs 2.4 Wo 44 ), troilite, kamacite, and plagioclase (Ab 74.5 Or 4 An 21.5 ). Minor phases include schreibersite and K‐feldspar. The meteorite is highly weathered (W3) and weakly shocked (S2). We determine a whole rock oxygen isotopic composition of δ 18 O = 7.50‰, δ 17 O = 3.52‰. Comparisons of these data with other primitive achondrites have resulted in the reclassification of this meteorite as a member of the winonaite group. The occurrences of troilite, metal, and schreibersite in GRV 021663 indicate that these minerals were once completely molten. Euhedral inclusions of pyroxene within plagioclase further suggest that these may have crystallized from a silicate melt, while the depletion of plagioclase, metal, and troilite indicates that GRV 021663 could represent a residuum following partial melting on its parent asteroid. Trace element distributions in silicate minerals do not, however, confirm this scenario. As with other winonaite meteorites, the formation of GRV 021663 probably relates to brecciation and mixing of heterogeneous lithologies, followed by varying degrees of thermal metamorphism on the parent body asteroid. Peak metamorphic conditions may have resulted in localized partial melting of metal and silicate mineralogies, but our data are not conclusive. Article in Journal/Newspaper Antarc* Antarctic Antarctica Wiley Online Library Meteoritics & Planetary Science 46 9 1329 1344 |
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English |
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Abstract– The Grove Mountains (GRV) 021663 meteorite was collected from the Grove Mountains region of Antarctica. The meteorite is composed primarily of olivine (Fa 5.4 ), orthopyroxene (Fs 4.7 Wo 3.0 ), chromian diopside (En 53.6 Fs 2.4 Wo 44 ), troilite, kamacite, and plagioclase (Ab 74.5 Or 4 An 21.5 ). Minor phases include schreibersite and K‐feldspar. The meteorite is highly weathered (W3) and weakly shocked (S2). We determine a whole rock oxygen isotopic composition of δ 18 O = 7.50‰, δ 17 O = 3.52‰. Comparisons of these data with other primitive achondrites have resulted in the reclassification of this meteorite as a member of the winonaite group. The occurrences of troilite, metal, and schreibersite in GRV 021663 indicate that these minerals were once completely molten. Euhedral inclusions of pyroxene within plagioclase further suggest that these may have crystallized from a silicate melt, while the depletion of plagioclase, metal, and troilite indicates that GRV 021663 could represent a residuum following partial melting on its parent asteroid. Trace element distributions in silicate minerals do not, however, confirm this scenario. As with other winonaite meteorites, the formation of GRV 021663 probably relates to brecciation and mixing of heterogeneous lithologies, followed by varying degrees of thermal metamorphism on the parent body asteroid. Peak metamorphic conditions may have resulted in localized partial melting of metal and silicate mineralogies, but our data are not conclusive. |
format |
Article in Journal/Newspaper |
author |
LI, Shijie WANG, Shijie BAO, Huiming MIAO, Bingkui LIU, Shen COULSON, Ian M. LI, Xiongyao LI, Yang |
spellingShingle |
LI, Shijie WANG, Shijie BAO, Huiming MIAO, Bingkui LIU, Shen COULSON, Ian M. LI, Xiongyao LI, Yang The Antarctic achondrite, Grove Mountains 021663: An olivine‐rich winonaite |
author_facet |
LI, Shijie WANG, Shijie BAO, Huiming MIAO, Bingkui LIU, Shen COULSON, Ian M. LI, Xiongyao LI, Yang |
author_sort |
LI, Shijie |
title |
The Antarctic achondrite, Grove Mountains 021663: An olivine‐rich winonaite |
title_short |
The Antarctic achondrite, Grove Mountains 021663: An olivine‐rich winonaite |
title_full |
The Antarctic achondrite, Grove Mountains 021663: An olivine‐rich winonaite |
title_fullStr |
The Antarctic achondrite, Grove Mountains 021663: An olivine‐rich winonaite |
title_full_unstemmed |
The Antarctic achondrite, Grove Mountains 021663: An olivine‐rich winonaite |
title_sort |
antarctic achondrite, grove mountains 021663: an olivine‐rich winonaite |
publisher |
Wiley |
publishDate |
2011 |
url |
http://dx.doi.org/10.1111/j.1945-5100.2011.01232.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1945-5100.2011.01232.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1945-5100.2011.01232.x |
genre |
Antarc* Antarctic Antarctica |
genre_facet |
Antarc* Antarctic Antarctica |
op_source |
Meteoritics & Planetary Science volume 46, issue 9, page 1329-1344 ISSN 1086-9379 1945-5100 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1945-5100.2011.01232.x |
container_title |
Meteoritics & Planetary Science |
container_volume |
46 |
container_issue |
9 |
container_start_page |
1329 |
op_container_end_page |
1344 |
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1810496662846570496 |