The Antarctic achondrite, Grove Mountains 021663: An olivine-rich winonaite
The Grove Mountains (GRV) 021663 meteorite was collected from the Grove Mountains region of Antarctica. The meteorite is composed primarily of olivine (Fa5.4), orthopyroxene (Fs4.7Wo3.0), chromian diopside (En53.6Fs2.4Wo44), troilite, kamacite, and plagioclase (Ab74.5Or4An21.5). Minor phases include...
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ftlouisianastuir:oai:digitalcommons.lsu.edu:geo_pubs-1229 2023-06-11T04:05:46+02:00 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 2011-09-01T07:00:00Z https://digitalcommons.lsu.edu/geo_pubs/230 https://doi.org/10.1111/j.1945-5100.2011.01232.x unknown LSU Digital Commons https://digitalcommons.lsu.edu/geo_pubs/230 doi:10.1111/j.1945-5100.2011.01232.x Faculty Publications text 2011 ftlouisianastuir https://doi.org/10.1111/j.1945-5100.2011.01232.x 2023-05-28T18:16:46Z The Grove Mountains (GRV) 021663 meteorite was collected from the Grove Mountains region of Antarctica. The meteorite is composed primarily of olivine (Fa5.4), orthopyroxene (Fs4.7Wo3.0), chromian diopside (En53.6Fs2.4Wo44), troilite, kamacite, and plagioclase (Ab74.5Or4An21.5). 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 δ18O=7.50‰, δ17O=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. © The Meteoritical Society, 2011. Text Antarc* Antarctic Antarctica LSU Digital Commons (Louisiana State University) Antarctic The Antarctic Grove Mountains ENVELOPE(75.000,75.000,-72.750,-72.750) Meteoritics & Planetary Science 46 9 1329 1344 |
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Open Polar |
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LSU Digital Commons (Louisiana State University) |
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ftlouisianastuir |
language |
unknown |
description |
The Grove Mountains (GRV) 021663 meteorite was collected from the Grove Mountains region of Antarctica. The meteorite is composed primarily of olivine (Fa5.4), orthopyroxene (Fs4.7Wo3.0), chromian diopside (En53.6Fs2.4Wo44), troilite, kamacite, and plagioclase (Ab74.5Or4An21.5). 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 δ18O=7.50‰, δ17O=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. © The Meteoritical Society, 2011. |
format |
Text |
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 |
LSU Digital Commons |
publishDate |
2011 |
url |
https://digitalcommons.lsu.edu/geo_pubs/230 https://doi.org/10.1111/j.1945-5100.2011.01232.x |
long_lat |
ENVELOPE(75.000,75.000,-72.750,-72.750) |
geographic |
Antarctic The Antarctic Grove Mountains |
geographic_facet |
Antarctic The Antarctic Grove Mountains |
genre |
Antarc* Antarctic Antarctica |
genre_facet |
Antarc* Antarctic Antarctica |
op_source |
Faculty Publications |
op_relation |
https://digitalcommons.lsu.edu/geo_pubs/230 doi:10.1111/j.1945-5100.2011.01232.x |
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 |
_version_ |
1768377410270527488 |