Sm-Nd AND Rb-Sr AGES OF GARNET-BEARING GRANITE FROM THE SØR RONDANE MOUNTAINS, EAST ANTARCTICA
New Sm-Nd and Rb-Sr data are reported for the garnet-bearing biotite granite dike from the northwestern part of the Brattnipene area, Sør Rondane Mountains (71°52.5'S, 24°11'E). The mode of occurrence suggests that the granite intruded during the waning stage of the granulite facies region...
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ftnipr:oai:nipr.repo.nii.ac.jp:00002733 2023-05-15T13:49:00+02:00 Sm-Nd AND Rb-Sr AGES OF GARNET-BEARING GRANITE FROM THE SØR RONDANE MOUNTAINS, EAST ANTARCTICA カガミ ヒロオ シライシ カズユキ Hiroo KAGAMI Kazuyuki SHIRAISHI 1993-09 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2733 http://id.nii.ac.jp/1291/00002733/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2733&item_no=1&attribute_id=18&file_no=1 en eng ABSTRACT Institute for Study of the Earth's Interior, Okayama University National Institute of Polar Research https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2733 http://id.nii.ac.jp/1291/00002733/ AA1072335X Proceedings of the NIPR Symposium on Antarctic Geosciences, 6, 145(1993-09) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2733&item_no=1&attribute_id=18&file_no=1 Departmental Bulletin Paper P(論文) 1993 ftnipr 2022-11-26T19:42:11Z New Sm-Nd and Rb-Sr data are reported for the garnet-bearing biotite granite dike from the northwestern part of the Brattnipene area, Sør Rondane Mountains (71°52.5'S, 24°11'E). The mode of occurrence suggests that the granite intruded during the waning stage of the granulite facies regional metamorphism. The Sm-Nd whole-rock-mineral (biotite, plagioclase and garnet) isochron yields 1116±35Ma (MSWD=0.52) with an initial ratio of 0.511618±0.000056 (εNd=+8.2). The isochron is largely controlled by garnet. The calculation based on garnet and whole-rock pair shows 1118Ma. Biotite and plagioclase plot slightly away from the 1118Ma isochron. In the Rb-Sr system, no meaningful isochron for the whole-rock and three minerals can be drawn due to isotopic scatter. The whole-rock and plagioclase pair and the whole-rock and biotite pair yield 560Ma and 496Ma, respectively. The whole-rock and garnet pair cannot be calculated because of low concentration of Rb and Sr in garnet. The Sm-Nd age of 1118Ma is attributed to the age of the granite formation. This age is conformable with the Sm-Nd whole-rock isochron age of 961±101Ma for granulites from the nearby area reported by K. SHIRAISHI and H. KAGAMI (Recent Progress in Antarctic Earth Science, ed. by Y. YOSHIDA et al. Tokyo, Terra Sci. Publ., 29,1992). In addition Rb-Sr mineral ages of 560Ma and 469Ma for the granite are in good agreement with those of 560Ma (whole-rock, hornblende and plagioclase) and 490Ma (whole-rock and biotite) for the granulites. Report Antarc* Antarctic Antarctica East Antarctica National Institute of Polar Research Repository, Japan Antarctic East Antarctica Sør-Rondane ENVELOPE(25.000,25.000,-72.000,-72.000) Sør Rondane Mountains ENVELOPE(25.000,25.000,-72.000,-72.000) Brattnipene ENVELOPE(24.533,24.533,-71.883,-71.883) |
institution |
Open Polar |
collection |
National Institute of Polar Research Repository, Japan |
op_collection_id |
ftnipr |
language |
English |
description |
New Sm-Nd and Rb-Sr data are reported for the garnet-bearing biotite granite dike from the northwestern part of the Brattnipene area, Sør Rondane Mountains (71°52.5'S, 24°11'E). The mode of occurrence suggests that the granite intruded during the waning stage of the granulite facies regional metamorphism. The Sm-Nd whole-rock-mineral (biotite, plagioclase and garnet) isochron yields 1116±35Ma (MSWD=0.52) with an initial ratio of 0.511618±0.000056 (εNd=+8.2). The isochron is largely controlled by garnet. The calculation based on garnet and whole-rock pair shows 1118Ma. Biotite and plagioclase plot slightly away from the 1118Ma isochron. In the Rb-Sr system, no meaningful isochron for the whole-rock and three minerals can be drawn due to isotopic scatter. The whole-rock and plagioclase pair and the whole-rock and biotite pair yield 560Ma and 496Ma, respectively. The whole-rock and garnet pair cannot be calculated because of low concentration of Rb and Sr in garnet. The Sm-Nd age of 1118Ma is attributed to the age of the granite formation. This age is conformable with the Sm-Nd whole-rock isochron age of 961±101Ma for granulites from the nearby area reported by K. SHIRAISHI and H. KAGAMI (Recent Progress in Antarctic Earth Science, ed. by Y. YOSHIDA et al. Tokyo, Terra Sci. Publ., 29,1992). In addition Rb-Sr mineral ages of 560Ma and 469Ma for the granite are in good agreement with those of 560Ma (whole-rock, hornblende and plagioclase) and 490Ma (whole-rock and biotite) for the granulites. |
format |
Report |
author |
カガミ ヒロオ シライシ カズユキ Hiroo KAGAMI Kazuyuki SHIRAISHI |
spellingShingle |
カガミ ヒロオ シライシ カズユキ Hiroo KAGAMI Kazuyuki SHIRAISHI Sm-Nd AND Rb-Sr AGES OF GARNET-BEARING GRANITE FROM THE SØR RONDANE MOUNTAINS, EAST ANTARCTICA |
author_facet |
カガミ ヒロオ シライシ カズユキ Hiroo KAGAMI Kazuyuki SHIRAISHI |
author_sort |
カガミ ヒロオ |
title |
Sm-Nd AND Rb-Sr AGES OF GARNET-BEARING GRANITE FROM THE SØR RONDANE MOUNTAINS, EAST ANTARCTICA |
title_short |
Sm-Nd AND Rb-Sr AGES OF GARNET-BEARING GRANITE FROM THE SØR RONDANE MOUNTAINS, EAST ANTARCTICA |
title_full |
Sm-Nd AND Rb-Sr AGES OF GARNET-BEARING GRANITE FROM THE SØR RONDANE MOUNTAINS, EAST ANTARCTICA |
title_fullStr |
Sm-Nd AND Rb-Sr AGES OF GARNET-BEARING GRANITE FROM THE SØR RONDANE MOUNTAINS, EAST ANTARCTICA |
title_full_unstemmed |
Sm-Nd AND Rb-Sr AGES OF GARNET-BEARING GRANITE FROM THE SØR RONDANE MOUNTAINS, EAST ANTARCTICA |
title_sort |
sm-nd and rb-sr ages of garnet-bearing granite from the sør rondane mountains, east antarctica |
publisher |
ABSTRACT |
publishDate |
1993 |
url |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2733 http://id.nii.ac.jp/1291/00002733/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2733&item_no=1&attribute_id=18&file_no=1 |
long_lat |
ENVELOPE(25.000,25.000,-72.000,-72.000) ENVELOPE(25.000,25.000,-72.000,-72.000) ENVELOPE(24.533,24.533,-71.883,-71.883) |
geographic |
Antarctic East Antarctica Sør-Rondane Sør Rondane Mountains Brattnipene |
geographic_facet |
Antarctic East Antarctica Sør-Rondane Sør Rondane Mountains Brattnipene |
genre |
Antarc* Antarctic Antarctica East Antarctica |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica |
op_relation |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2733 http://id.nii.ac.jp/1291/00002733/ AA1072335X Proceedings of the NIPR Symposium on Antarctic Geosciences, 6, 145(1993-09) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2733&item_no=1&attribute_id=18&file_no=1 |
_version_ |
1766250304285704192 |