From olivine to ringwoodite : a TEM study of a complex process
Abstract: The study of shock metamorphism of olivine might help to constrain impact events in the history of meteorites. Although shock features in olivine are well known, so far, there are processes that are not yet completely understood. In shock veins, olivine clasts with a complex structure, wit...
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ftunivantwerpen:c:irua:126058 2024-09-30T14:27:09+00:00 From olivine to ringwoodite : a TEM study of a complex process Pittarello, Lidia Ji, Gang Yamaguchi, Akira Schryvers, Dominique Debaille, Vinciane Claeys, Philippe 2015 https://hdl.handle.net/10067/1260580151162165141 eng eng info:eu-repo/semantics/altIdentifier/doi/10.1111/MAPS.12441 info:eu-repo/semantics/altIdentifier/isi/000354258400008 info:eu-repo/semantics/closedAccess 1086-9379 Meteoritics and Planetary Science Physics Chemistry info:eu-repo/semantics/article 2015 ftunivantwerpen https://doi.org/10.1111/MAPS.12441 2024-09-10T04:06:34Z Abstract: The study of shock metamorphism of olivine might help to constrain impact events in the history of meteorites. Although shock features in olivine are well known, so far, there are processes that are not yet completely understood. In shock veins, olivine clasts with a complex structure, with a ringwoodite rim and a dense network of lamellae of unidentified nature in the core, have been reported in the literature. A highly shocked (S5-6), L6 meteorite, Asuka 09584, which was recently collected in Antarctica by a Belgian-Japanese joint expedition, contains this type of shocked olivine clasts and has been, therefore, selected for detailed investigations of these features by transmission electron microscopy (TEM). Petrographic, geochemical, and crystallographic studies showed that the rim of these shocked clasts consists of an aggregate of nanocrystals of ringwoodite, with lower Mg/Fe ratio than the unshocked olivine. The clast's core consists of an aggregate of iso-oriented grains of olivine and wadsleyite, with higher Mg/Fe ratio than the unshocked olivine. This aggregate is crosscut by veinlets of nanocrystals of olivine, with extremely low Mg/Fe ratio. The formation of the ringwoodite rim is likely due to solid-state, diffusion-controlled, transformation from olivine under high-temperature conditions. The aggregate of iso-oriented olivine and wadsleyite crystals is interpreted to have formed also by a solid-state process, likely by coherent intracrystalline nucleation. Following the compression, shock release is believed to have caused opening of cracks and fractures in olivine and formation of olivine melt, which has lately crystallized under postshock equilibrium pressure conditions as olivine. Article in Journal/Newspaper Antarc* Antarctica IRUA - Institutional Repository van de Universiteit Antwerpen Meteoritics & Planetary Science 50 5 944 957 |
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Open Polar |
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IRUA - Institutional Repository van de Universiteit Antwerpen |
op_collection_id |
ftunivantwerpen |
language |
English |
topic |
Physics Chemistry |
spellingShingle |
Physics Chemistry Pittarello, Lidia Ji, Gang Yamaguchi, Akira Schryvers, Dominique Debaille, Vinciane Claeys, Philippe From olivine to ringwoodite : a TEM study of a complex process |
topic_facet |
Physics Chemistry |
description |
Abstract: The study of shock metamorphism of olivine might help to constrain impact events in the history of meteorites. Although shock features in olivine are well known, so far, there are processes that are not yet completely understood. In shock veins, olivine clasts with a complex structure, with a ringwoodite rim and a dense network of lamellae of unidentified nature in the core, have been reported in the literature. A highly shocked (S5-6), L6 meteorite, Asuka 09584, which was recently collected in Antarctica by a Belgian-Japanese joint expedition, contains this type of shocked olivine clasts and has been, therefore, selected for detailed investigations of these features by transmission electron microscopy (TEM). Petrographic, geochemical, and crystallographic studies showed that the rim of these shocked clasts consists of an aggregate of nanocrystals of ringwoodite, with lower Mg/Fe ratio than the unshocked olivine. The clast's core consists of an aggregate of iso-oriented grains of olivine and wadsleyite, with higher Mg/Fe ratio than the unshocked olivine. This aggregate is crosscut by veinlets of nanocrystals of olivine, with extremely low Mg/Fe ratio. The formation of the ringwoodite rim is likely due to solid-state, diffusion-controlled, transformation from olivine under high-temperature conditions. The aggregate of iso-oriented olivine and wadsleyite crystals is interpreted to have formed also by a solid-state process, likely by coherent intracrystalline nucleation. Following the compression, shock release is believed to have caused opening of cracks and fractures in olivine and formation of olivine melt, which has lately crystallized under postshock equilibrium pressure conditions as olivine. |
format |
Article in Journal/Newspaper |
author |
Pittarello, Lidia Ji, Gang Yamaguchi, Akira Schryvers, Dominique Debaille, Vinciane Claeys, Philippe |
author_facet |
Pittarello, Lidia Ji, Gang Yamaguchi, Akira Schryvers, Dominique Debaille, Vinciane Claeys, Philippe |
author_sort |
Pittarello, Lidia |
title |
From olivine to ringwoodite : a TEM study of a complex process |
title_short |
From olivine to ringwoodite : a TEM study of a complex process |
title_full |
From olivine to ringwoodite : a TEM study of a complex process |
title_fullStr |
From olivine to ringwoodite : a TEM study of a complex process |
title_full_unstemmed |
From olivine to ringwoodite : a TEM study of a complex process |
title_sort |
from olivine to ringwoodite : a tem study of a complex process |
publishDate |
2015 |
url |
https://hdl.handle.net/10067/1260580151162165141 |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
1086-9379 Meteoritics and Planetary Science |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1111/MAPS.12441 info:eu-repo/semantics/altIdentifier/isi/000354258400008 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1111/MAPS.12441 |
container_title |
Meteoritics & Planetary Science |
container_volume |
50 |
container_issue |
5 |
container_start_page |
944 |
op_container_end_page |
957 |
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1811633304322965504 |