Petrography of a discordant metabasite from Skallen, Lutzow-Holmbukta, East Antarctica
A discordant metabasite from Skallen is an olivine tholeiite resembling petrochemically with some of the Proterozoic Amundsen dikes of Enderby Land. Field occurrence, mineral association, and microstructure including zoning structure of minerals are not incompatible with the polymetamorphic interpre...
Main Authors: | , |
---|---|
Format: | Report |
Language: | English |
Published: |
Department of Geosciences, Faculty of Science, Osaka City University
1983
|
Subjects: | |
Online Access: | https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=1474 http://id.nii.ac.jp/1291/00001474/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1474&item_no=1&attribute_id=18&file_no=1 |
id |
ftnipr:oai:nipr.repo.nii.ac.jp:00001474 |
---|---|
record_format |
openpolar |
spelling |
ftnipr:oai:nipr.repo.nii.ac.jp:00001474 2023-05-15T13:47:59+02:00 Petrography of a discordant metabasite from Skallen, Lutzow-Holmbukta, East Antarctica Masaru Yoshida Nobuyuki Aikawa 1983-10 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=1474 http://id.nii.ac.jp/1291/00001474/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1474&item_no=1&attribute_id=18&file_no=1 en eng Department of Geosciences, Faculty of Science, Osaka City University https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=1474 http://id.nii.ac.jp/1291/00001474/ AA00733561 Memoirs of National Institute of Polar Research. Special issue, 28, 144-165(1983-10) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1474&item_no=1&attribute_id=18&file_no=1 Departmental Bulletin Paper P(論文) 1983 ftnipr 2022-11-12T19:42:17Z A discordant metabasite from Skallen is an olivine tholeiite resembling petrochemically with some of the Proterozoic Amundsen dikes of Enderby Land. Field occurrence, mineral association, and microstructure including zoning structure of minerals are not incompatible with the polymetamorphic interpretation of the area presented by YOSHIDA et al. (submitted to Antarctic Earth Science, 1982), and indicate that the rock intruded in synchronous with or earlier than possibly the second and probably the first tectono-metamorphic event of YOSHIDA et al. Microprobe analyses and compositional zoning of constituent minerals of the metabasite are presented and some temperature and pressure values are calculated utilizing five different geothermometers and a geobarometer. Among calculated values, 693±3℃, 768±3℃, and 823±22℃ obtained by averaging temperatures after margin pairs of garnet-clinopyroxene (ELLIS and GREEN : Contrib. Mineral. Petrol., 71,13,1979) and garnet-biotite (THOMPSON : Am. J. Sci., 276,425,1976) geothermometers, after core pairs of two pyroxenes (WOOD and BANNO : Contrib. Mineral. Petrol., 42,109,1973) and garnet-clinopyroxene geothermometers, and averaging highest temperatures after core pairs of two pyroxenes and garnet-clinopyroxene geothermometers are considered possible to be explained either by the polymetamorphic or by the monometamorphic history of the discordant metabasite. It is stressed that the peak of a dominant metamorphism is considered to have reached the temperature much higher than 823℃ whichever the metamorphic history might have been. 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 Skallen ENVELOPE(39.467,39.467,-69.650,-69.650) |
institution |
Open Polar |
collection |
National Institute of Polar Research Repository, Japan |
op_collection_id |
ftnipr |
language |
English |
description |
A discordant metabasite from Skallen is an olivine tholeiite resembling petrochemically with some of the Proterozoic Amundsen dikes of Enderby Land. Field occurrence, mineral association, and microstructure including zoning structure of minerals are not incompatible with the polymetamorphic interpretation of the area presented by YOSHIDA et al. (submitted to Antarctic Earth Science, 1982), and indicate that the rock intruded in synchronous with or earlier than possibly the second and probably the first tectono-metamorphic event of YOSHIDA et al. Microprobe analyses and compositional zoning of constituent minerals of the metabasite are presented and some temperature and pressure values are calculated utilizing five different geothermometers and a geobarometer. Among calculated values, 693±3℃, 768±3℃, and 823±22℃ obtained by averaging temperatures after margin pairs of garnet-clinopyroxene (ELLIS and GREEN : Contrib. Mineral. Petrol., 71,13,1979) and garnet-biotite (THOMPSON : Am. J. Sci., 276,425,1976) geothermometers, after core pairs of two pyroxenes (WOOD and BANNO : Contrib. Mineral. Petrol., 42,109,1973) and garnet-clinopyroxene geothermometers, and averaging highest temperatures after core pairs of two pyroxenes and garnet-clinopyroxene geothermometers are considered possible to be explained either by the polymetamorphic or by the monometamorphic history of the discordant metabasite. It is stressed that the peak of a dominant metamorphism is considered to have reached the temperature much higher than 823℃ whichever the metamorphic history might have been. |
format |
Report |
author |
Masaru Yoshida Nobuyuki Aikawa |
spellingShingle |
Masaru Yoshida Nobuyuki Aikawa Petrography of a discordant metabasite from Skallen, Lutzow-Holmbukta, East Antarctica |
author_facet |
Masaru Yoshida Nobuyuki Aikawa |
author_sort |
Masaru Yoshida |
title |
Petrography of a discordant metabasite from Skallen, Lutzow-Holmbukta, East Antarctica |
title_short |
Petrography of a discordant metabasite from Skallen, Lutzow-Holmbukta, East Antarctica |
title_full |
Petrography of a discordant metabasite from Skallen, Lutzow-Holmbukta, East Antarctica |
title_fullStr |
Petrography of a discordant metabasite from Skallen, Lutzow-Holmbukta, East Antarctica |
title_full_unstemmed |
Petrography of a discordant metabasite from Skallen, Lutzow-Holmbukta, East Antarctica |
title_sort |
petrography of a discordant metabasite from skallen, lutzow-holmbukta, east antarctica |
publisher |
Department of Geosciences, Faculty of Science, Osaka City University |
publishDate |
1983 |
url |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=1474 http://id.nii.ac.jp/1291/00001474/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1474&item_no=1&attribute_id=18&file_no=1 |
long_lat |
ENVELOPE(39.467,39.467,-69.650,-69.650) |
geographic |
Antarctic East Antarctica Skallen |
geographic_facet |
Antarctic East Antarctica Skallen |
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=1474 http://id.nii.ac.jp/1291/00001474/ AA00733561 Memoirs of National Institute of Polar Research. Special issue, 28, 144-165(1983-10) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1474&item_no=1&attribute_id=18&file_no=1 |
_version_ |
1766248278045753344 |