Petrology of chondrules in ALH-77015 (L3) chondrite
Chondrules in ALH-77015 (L3) chondrite were studied petrographically. Size and bulk chemical composition of about one hundred chondrules were investigated with relation to their texture. There seems to be no relation between the size and the texture, and the texture is mainly controlled by chemical...
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Geological Institute, Faculty of Science, University of Tokyo
1981
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ftnipr:oai:nipr.repo.nii.ac.jp:00001210 2023-05-15T17:10:58+02:00 Petrology of chondrules in ALH-77015 (L3) chondrite Hiroko Nagahara 1981-12 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=1210 http://id.nii.ac.jp/1291/00001210/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1210&item_no=1&attribute_id=18&file_no=1 en eng Geological Institute, Faculty of Science, University of Tokyo https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=1210 http://id.nii.ac.jp/1291/00001210/ AA00733561 Memoirs of National Institute of Polar Research. Special issue, 20, 145-160(1981-12) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1210&item_no=1&attribute_id=18&file_no=1 Departmental Bulletin Paper P(論文) 1981 ftnipr 2022-11-12T19:42:05Z Chondrules in ALH-77015 (L3) chondrite were studied petrographically. Size and bulk chemical composition of about one hundred chondrules were investigated with relation to their texture. There seems to be no relation between the size and the texture, and the texture is mainly controlled by chemical composition, especially SiO_2,MgO and FeO contents. Another controlling factor, such as cooling rate, degree of supercooling or maximum temperature of heating, seems to be subordinate. Two types of olivine grains, different in the occurrence and mineralogy, are contained in some porphyritic chondrules. One is thought to be a relic crystal which had already existed before chondrules formation, representing secondary origin of chondrules. It further shows a relative low temperature of heating and a short duration of melting at the time of chondrule formation. Report Memoirs of National Institute of Polar Research Polar Research National Institute of Polar Research Repository, Japan |
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Open Polar |
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National Institute of Polar Research Repository, Japan |
op_collection_id |
ftnipr |
language |
English |
description |
Chondrules in ALH-77015 (L3) chondrite were studied petrographically. Size and bulk chemical composition of about one hundred chondrules were investigated with relation to their texture. There seems to be no relation between the size and the texture, and the texture is mainly controlled by chemical composition, especially SiO_2,MgO and FeO contents. Another controlling factor, such as cooling rate, degree of supercooling or maximum temperature of heating, seems to be subordinate. Two types of olivine grains, different in the occurrence and mineralogy, are contained in some porphyritic chondrules. One is thought to be a relic crystal which had already existed before chondrules formation, representing secondary origin of chondrules. It further shows a relative low temperature of heating and a short duration of melting at the time of chondrule formation. |
format |
Report |
author |
Hiroko Nagahara |
spellingShingle |
Hiroko Nagahara Petrology of chondrules in ALH-77015 (L3) chondrite |
author_facet |
Hiroko Nagahara |
author_sort |
Hiroko Nagahara |
title |
Petrology of chondrules in ALH-77015 (L3) chondrite |
title_short |
Petrology of chondrules in ALH-77015 (L3) chondrite |
title_full |
Petrology of chondrules in ALH-77015 (L3) chondrite |
title_fullStr |
Petrology of chondrules in ALH-77015 (L3) chondrite |
title_full_unstemmed |
Petrology of chondrules in ALH-77015 (L3) chondrite |
title_sort |
petrology of chondrules in alh-77015 (l3) chondrite |
publisher |
Geological Institute, Faculty of Science, University of Tokyo |
publishDate |
1981 |
url |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=1210 http://id.nii.ac.jp/1291/00001210/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1210&item_no=1&attribute_id=18&file_no=1 |
genre |
Memoirs of National Institute of Polar Research Polar Research |
genre_facet |
Memoirs of National Institute of Polar Research Polar Research |
op_relation |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=1210 http://id.nii.ac.jp/1291/00001210/ AA00733561 Memoirs of National Institute of Polar Research. Special issue, 20, 145-160(1981-12) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1210&item_no=1&attribute_id=18&file_no=1 |
_version_ |
1766067738359365632 |