Petrology of chondrules, inclusions and isolated olivine grains in ALH-77307 (CO3) chondrite
A petrological study has been conducted on ALH-77307 (CO3) chondrite. Chondrules are classified into magnesian type and iron-rich type. The magnesian chondrules contain olivine and clinoenstatite with a small amount of groundmass, whereas the iron-rich chondrules contain only olivine as phenocrysts...
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Geological Institute, University of Tokyo
1982
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ftnipr:oai:nipr.repo.nii.ac.jp:00001379 2023-05-15T17:10:58+02:00 Petrology of chondrules, inclusions and isolated olivine grains in ALH-77307 (CO3) chondrite Hiroko Nagahara Ikuo Kushiro 1982-12 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=1379 http://id.nii.ac.jp/1291/00001379/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1379&item_no=1&attribute_id=18&file_no=1 en eng Geological Institute, University of Tokyo https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=1379 http://id.nii.ac.jp/1291/00001379/ AA00733561 Memoirs of National Institute of Polar Research. Special issue, 25, 66-77(1982-12) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1379&item_no=1&attribute_id=18&file_no=1 Departmental Bulletin Paper P(論文) 1982 ftnipr 2022-11-12T19:42:11Z A petrological study has been conducted on ALH-77307 (CO3) chondrite. Chondrules are classified into magnesian type and iron-rich type. The magnesian chondrules contain olivine and clinoenstatite with a small amount of groundmass, whereas the iron-rich chondrules contain only olivine as phenocrysts in the groundmass. Inclusions show gradual changes in crystallinity, grain size of constituents, texture and shape. The difference among the inclusions is considered to be due to the difference of heating temperature of the precursor finegrained materials. Intensive heating of the inclusions might have formed the magnesian chondrules. Isolated olivine grains are also classified into magnesian and iron-rich types, which are thought to have been derived from the magnesian and iron-rich chondrules, respectively. Genetical relations of chondrules, inclusions and isolated olivine grains are discussed by the process of condensation, successive heating, break up, and accreation. 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 |
A petrological study has been conducted on ALH-77307 (CO3) chondrite. Chondrules are classified into magnesian type and iron-rich type. The magnesian chondrules contain olivine and clinoenstatite with a small amount of groundmass, whereas the iron-rich chondrules contain only olivine as phenocrysts in the groundmass. Inclusions show gradual changes in crystallinity, grain size of constituents, texture and shape. The difference among the inclusions is considered to be due to the difference of heating temperature of the precursor finegrained materials. Intensive heating of the inclusions might have formed the magnesian chondrules. Isolated olivine grains are also classified into magnesian and iron-rich types, which are thought to have been derived from the magnesian and iron-rich chondrules, respectively. Genetical relations of chondrules, inclusions and isolated olivine grains are discussed by the process of condensation, successive heating, break up, and accreation. |
format |
Report |
author |
Hiroko Nagahara Ikuo Kushiro |
spellingShingle |
Hiroko Nagahara Ikuo Kushiro Petrology of chondrules, inclusions and isolated olivine grains in ALH-77307 (CO3) chondrite |
author_facet |
Hiroko Nagahara Ikuo Kushiro |
author_sort |
Hiroko Nagahara |
title |
Petrology of chondrules, inclusions and isolated olivine grains in ALH-77307 (CO3) chondrite |
title_short |
Petrology of chondrules, inclusions and isolated olivine grains in ALH-77307 (CO3) chondrite |
title_full |
Petrology of chondrules, inclusions and isolated olivine grains in ALH-77307 (CO3) chondrite |
title_fullStr |
Petrology of chondrules, inclusions and isolated olivine grains in ALH-77307 (CO3) chondrite |
title_full_unstemmed |
Petrology of chondrules, inclusions and isolated olivine grains in ALH-77307 (CO3) chondrite |
title_sort |
petrology of chondrules, inclusions and isolated olivine grains in alh-77307 (co3) chondrite |
publisher |
Geological Institute, University of Tokyo |
publishDate |
1982 |
url |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=1379 http://id.nii.ac.jp/1291/00001379/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1379&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=1379 http://id.nii.ac.jp/1291/00001379/ AA00733561 Memoirs of National Institute of Polar Research. Special issue, 25, 66-77(1982-12) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1379&item_no=1&attribute_id=18&file_no=1 |
_version_ |
1766067749948227584 |