Void structures in olivine grains in thermally metamorphosed Antarctic carbonaceous chondrite B-7904
The Antarctic carbonaceous chondrite Belgica-7904 suffered thermal metamorphism. The main constituent phyllosilicates of this meteorite are serpentine and/or saponite, which display transformation from serpentine to olivine or from saponite to enstatite in various degrees (J. AKAI : Geochim. Cosmoch...
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Department of Geology and Mineralogy, Faculty of Science, Niigata University
1994
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ftnipr:oai:nipr.repo.nii.ac.jp:00004638 2023-05-15T13:49:02+02:00 Void structures in olivine grains in thermally metamorphosed Antarctic carbonaceous chondrite B-7904 Junji Akai 1994-03 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=4638 http://id.nii.ac.jp/1291/00004638/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=4638&item_no=1&attribute_id=18&file_no=1 en eng Department of Geology and Mineralogy, Faculty of Science, Niigata University National Institute of Polar Research https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=4638 http://id.nii.ac.jp/1291/00004638/ AA10784627 Proceedings of the NIPR Symposium on Antarctic Meteorites, 7, 94-100(1994-03) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=4638&item_no=1&attribute_id=18&file_no=1 Departmental Bulletin Paper P(論文) 1994 ftnipr 2023-02-04T20:06:16Z The Antarctic carbonaceous chondrite Belgica-7904 suffered thermal metamorphism. The main constituent phyllosilicates of this meteorite are serpentine and/or saponite, which display transformation from serpentine to olivine or from saponite to enstatite in various degrees (J. AKAI : Geochim. Cosmochim. Acta, 52,1593,1988; Proc. NIPR Symp. Antarct. Meteorites, 3,55,1990). Detailed Transmission Electron Microscopy (TEM) observation of this meteorite reveals characteristic void structures, which are found mainly in olivine grains. The voids or bubble-like structures are very frequently found in some grains. The shapes of the voids are varied. Some are irregular and some are crystallographically controlled. Five possible mechanisms for their origin are : 1) thermal metamorphism, 2) irradiation by high energy particles in the solar nebula, 3) shock effects, 4) sample preparation artifacts and 5) alteration process. Among five or more possible mechanisms, the voids mostly likely formed during thermal metamorphism or as a result of irradiation damages by high energy particles in the early solar system. Report Antarc* Antarctic National Institute of Polar Research Repository, Japan Antarctic The Antarctic |
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National Institute of Polar Research Repository, Japan |
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English |
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The Antarctic carbonaceous chondrite Belgica-7904 suffered thermal metamorphism. The main constituent phyllosilicates of this meteorite are serpentine and/or saponite, which display transformation from serpentine to olivine or from saponite to enstatite in various degrees (J. AKAI : Geochim. Cosmochim. Acta, 52,1593,1988; Proc. NIPR Symp. Antarct. Meteorites, 3,55,1990). Detailed Transmission Electron Microscopy (TEM) observation of this meteorite reveals characteristic void structures, which are found mainly in olivine grains. The voids or bubble-like structures are very frequently found in some grains. The shapes of the voids are varied. Some are irregular and some are crystallographically controlled. Five possible mechanisms for their origin are : 1) thermal metamorphism, 2) irradiation by high energy particles in the solar nebula, 3) shock effects, 4) sample preparation artifacts and 5) alteration process. Among five or more possible mechanisms, the voids mostly likely formed during thermal metamorphism or as a result of irradiation damages by high energy particles in the early solar system. |
format |
Report |
author |
Junji Akai |
spellingShingle |
Junji Akai Void structures in olivine grains in thermally metamorphosed Antarctic carbonaceous chondrite B-7904 |
author_facet |
Junji Akai |
author_sort |
Junji Akai |
title |
Void structures in olivine grains in thermally metamorphosed Antarctic carbonaceous chondrite B-7904 |
title_short |
Void structures in olivine grains in thermally metamorphosed Antarctic carbonaceous chondrite B-7904 |
title_full |
Void structures in olivine grains in thermally metamorphosed Antarctic carbonaceous chondrite B-7904 |
title_fullStr |
Void structures in olivine grains in thermally metamorphosed Antarctic carbonaceous chondrite B-7904 |
title_full_unstemmed |
Void structures in olivine grains in thermally metamorphosed Antarctic carbonaceous chondrite B-7904 |
title_sort |
void structures in olivine grains in thermally metamorphosed antarctic carbonaceous chondrite b-7904 |
publisher |
Department of Geology and Mineralogy, Faculty of Science, Niigata University |
publishDate |
1994 |
url |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=4638 http://id.nii.ac.jp/1291/00004638/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=4638&item_no=1&attribute_id=18&file_no=1 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic |
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Antarc* Antarctic |
op_relation |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=4638 http://id.nii.ac.jp/1291/00004638/ AA10784627 Proceedings of the NIPR Symposium on Antarctic Meteorites, 7, 94-100(1994-03) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=4638&item_no=1&attribute_id=18&file_no=1 |
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1766250633165275136 |