Archean granulites from Mt.Riiser-Larsen in Enderby Land, East Antarctica
Mt. Riiser-Larsen in Enderby Land, which is a part of the Napier Complex in the East Antarctic Shield, is underlain by the Archean granulites formed under the pyroxene granulite-facies condition. Characteristic mineral associations of sapphirine+quartz, orthopyroxene+sillimanite+quartz and garnet+si...
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Department of Geology and Mineralogy, Faculty of Science, Hokkaido University/Institute of Mining Geology,Mining College, Akita University
1984
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ftnipr:oai:nipr.repo.nii.ac.jp:00001646 2023-05-15T13:47:59+02:00 Archean granulites from Mt.Riiser-Larsen in Enderby Land, East Antarctica Yoichi Motoyoshi Hiroharu Matsueda 1984-09 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=1646 http://id.nii.ac.jp/1291/00001646/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1646&item_no=1&attribute_id=18&file_no=1 en eng Department of Geology and Mineralogy, Faculty of Science, Hokkaido University/Institute of Mining Geology,Mining College, Akita University https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=1646 http://id.nii.ac.jp/1291/00001646/ AA00733561 Memoirs of National Institute of Polar Research. Special issue, 33, 103-125(1984-09) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1646&item_no=1&attribute_id=18&file_no=1 Departmental Bulletin Paper P(論文) 1984 ftnipr 2022-11-12T19:42:29Z Mt. Riiser-Larsen in Enderby Land, which is a part of the Napier Complex in the East Antarctic Shield, is underlain by the Archean granulites formed under the pyroxene granulite-facies condition. Characteristic mineral associations of sapphirine+quartz, orthopyroxene+sillimanite+quartz and garnet+sillimanite+quartz, all of which are breakdown products after cordierite, have coexisted stably at the peak of metamorphism. The variety of these mineral associations would be largely attributed to the chemical compositions of the rocks, namely the Mg/Fe ratio. On the basis of the phase relations determined experimentally and/or theoretically, and with the use of geothermometers and geobarometers, the P-T conditions at the peak of metamorphism are estimated to have been around 900℃, 8-10kbars. On the other hand, P_<H_2O> must have been considerably lower than P_ , which is suggested by the absence of migmatitic facies and hydrous phases in the mineral assemblages. Report Antarc* Antarctic Antarctica East Antarctica Enderby Land Memoirs of National Institute of Polar Research Polar Research National Institute of Polar Research Repository, Japan Antarctic East Antarctica Riiser-Larsen ENVELOPE(50.667,50.667,-66.783,-66.783) Napier ENVELOPE(-58.440,-58.440,-62.167,-62.167) |
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National Institute of Polar Research Repository, Japan |
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English |
description |
Mt. Riiser-Larsen in Enderby Land, which is a part of the Napier Complex in the East Antarctic Shield, is underlain by the Archean granulites formed under the pyroxene granulite-facies condition. Characteristic mineral associations of sapphirine+quartz, orthopyroxene+sillimanite+quartz and garnet+sillimanite+quartz, all of which are breakdown products after cordierite, have coexisted stably at the peak of metamorphism. The variety of these mineral associations would be largely attributed to the chemical compositions of the rocks, namely the Mg/Fe ratio. On the basis of the phase relations determined experimentally and/or theoretically, and with the use of geothermometers and geobarometers, the P-T conditions at the peak of metamorphism are estimated to have been around 900℃, 8-10kbars. On the other hand, P_<H_2O> must have been considerably lower than P_ , which is suggested by the absence of migmatitic facies and hydrous phases in the mineral assemblages. |
format |
Report |
author |
Yoichi Motoyoshi Hiroharu Matsueda |
spellingShingle |
Yoichi Motoyoshi Hiroharu Matsueda Archean granulites from Mt.Riiser-Larsen in Enderby Land, East Antarctica |
author_facet |
Yoichi Motoyoshi Hiroharu Matsueda |
author_sort |
Yoichi Motoyoshi |
title |
Archean granulites from Mt.Riiser-Larsen in Enderby Land, East Antarctica |
title_short |
Archean granulites from Mt.Riiser-Larsen in Enderby Land, East Antarctica |
title_full |
Archean granulites from Mt.Riiser-Larsen in Enderby Land, East Antarctica |
title_fullStr |
Archean granulites from Mt.Riiser-Larsen in Enderby Land, East Antarctica |
title_full_unstemmed |
Archean granulites from Mt.Riiser-Larsen in Enderby Land, East Antarctica |
title_sort |
archean granulites from mt.riiser-larsen in enderby land, east antarctica |
publisher |
Department of Geology and Mineralogy, Faculty of Science, Hokkaido University/Institute of Mining Geology,Mining College, Akita University |
publishDate |
1984 |
url |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=1646 http://id.nii.ac.jp/1291/00001646/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1646&item_no=1&attribute_id=18&file_no=1 |
long_lat |
ENVELOPE(50.667,50.667,-66.783,-66.783) ENVELOPE(-58.440,-58.440,-62.167,-62.167) |
geographic |
Antarctic East Antarctica Riiser-Larsen Napier |
geographic_facet |
Antarctic East Antarctica Riiser-Larsen Napier |
genre |
Antarc* Antarctic Antarctica East Antarctica Enderby Land Memoirs of National Institute of Polar Research Polar Research |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Enderby Land Memoirs of National Institute of Polar Research Polar Research |
op_relation |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=1646 http://id.nii.ac.jp/1291/00001646/ AA00733561 Memoirs of National Institute of Polar Research. Special issue, 33, 103-125(1984-09) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1646&item_no=1&attribute_id=18&file_no=1 |
_version_ |
1766248296628617216 |