^<40>Ar-^<39>Ar GEOCHRONOLOGICAL STUDIES OF GRANITIC ROCKS FROM SOUTH VICTORIA LAND, ANTARCTICA
^<40>Ar-^<39>Ar ages were obtained for two granitic rocks from the Dry Valleys region of South Victoria Land, Antarctica. One sample (biotite-rich fraction) of foliated granitoid gave three age increments of 491Ma, 502Ma and 506Ma, with K/Ca ratios suggesting influence of cooling ages of...
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Kanto Gakuen University
1995
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ftnipr:oai:nipr.repo.nii.ac.jp:00002793 2023-05-15T13:49:00+02:00 ^<40>Ar-^<39>Ar GEOCHRONOLOGICAL STUDIES OF GRANITIC ROCKS FROM SOUTH VICTORIA LAND, ANTARCTICA タキガミ ユタカ ワタナベ テルオ Yutaka TAKIGAMI Teruo WATANABE 1995-09 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2793 http://id.nii.ac.jp/1291/00002793/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2793&item_no=1&attribute_id=18&file_no=1 en eng Kanto Gakuen University Deptartment of Applied Geology, Universtiy of Technology:Department of Earth and Planetary Sciences, Graduate School of Science, Hokkaido University National Institute of Polar Research https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2793 http://id.nii.ac.jp/1291/00002793/ AA1072335X Proceedings of the NIPR Symposium on Antarctic Geosciences, 8, 160-168(1995-09) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2793&item_no=1&attribute_id=18&file_no=1 Departmental Bulletin Paper P(論文) 1995 ftnipr 2022-11-26T19:42:11Z ^<40>Ar-^<39>Ar ages were obtained for two granitic rocks from the Dry Valleys region of South Victoria Land, Antarctica. One sample (biotite-rich fraction) of foliated granitoid gave three age increments of 491Ma, 502Ma and 506Ma, with K/Ca ratios suggesting influence of cooling ages of biotite (younger age) and that of hornblende (older age). Granitoid emplacement is thought to have been before 506Ma, with cooling from biotite closure temperatures about 490Ma. A sample of unfoliated granitoid gave ages of 467-496Ma. The similarity of ages determined for both "pre-tectonic" and "post-tectonic" samples indicate closure of isotopic systems around 490Ma due to regional uplift/exhumation, rather than actual emplacement ages of individual plutons in South Victoria Land. Report Antarc* Antarctica Victoria Land National Institute of Polar Research Repository, Japan Victoria Land |
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Open Polar |
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National Institute of Polar Research Repository, Japan |
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ftnipr |
language |
English |
description |
^<40>Ar-^<39>Ar ages were obtained for two granitic rocks from the Dry Valleys region of South Victoria Land, Antarctica. One sample (biotite-rich fraction) of foliated granitoid gave three age increments of 491Ma, 502Ma and 506Ma, with K/Ca ratios suggesting influence of cooling ages of biotite (younger age) and that of hornblende (older age). Granitoid emplacement is thought to have been before 506Ma, with cooling from biotite closure temperatures about 490Ma. A sample of unfoliated granitoid gave ages of 467-496Ma. The similarity of ages determined for both "pre-tectonic" and "post-tectonic" samples indicate closure of isotopic systems around 490Ma due to regional uplift/exhumation, rather than actual emplacement ages of individual plutons in South Victoria Land. |
format |
Report |
author |
タキガミ ユタカ ワタナベ テルオ Yutaka TAKIGAMI Teruo WATANABE |
spellingShingle |
タキガミ ユタカ ワタナベ テルオ Yutaka TAKIGAMI Teruo WATANABE ^<40>Ar-^<39>Ar GEOCHRONOLOGICAL STUDIES OF GRANITIC ROCKS FROM SOUTH VICTORIA LAND, ANTARCTICA |
author_facet |
タキガミ ユタカ ワタナベ テルオ Yutaka TAKIGAMI Teruo WATANABE |
author_sort |
タキガミ ユタカ |
title |
^<40>Ar-^<39>Ar GEOCHRONOLOGICAL STUDIES OF GRANITIC ROCKS FROM SOUTH VICTORIA LAND, ANTARCTICA |
title_short |
^<40>Ar-^<39>Ar GEOCHRONOLOGICAL STUDIES OF GRANITIC ROCKS FROM SOUTH VICTORIA LAND, ANTARCTICA |
title_full |
^<40>Ar-^<39>Ar GEOCHRONOLOGICAL STUDIES OF GRANITIC ROCKS FROM SOUTH VICTORIA LAND, ANTARCTICA |
title_fullStr |
^<40>Ar-^<39>Ar GEOCHRONOLOGICAL STUDIES OF GRANITIC ROCKS FROM SOUTH VICTORIA LAND, ANTARCTICA |
title_full_unstemmed |
^<40>Ar-^<39>Ar GEOCHRONOLOGICAL STUDIES OF GRANITIC ROCKS FROM SOUTH VICTORIA LAND, ANTARCTICA |
title_sort |
^<40>ar-^<39>ar geochronological studies of granitic rocks from south victoria land, antarctica |
publisher |
Kanto Gakuen University |
publishDate |
1995 |
url |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2793 http://id.nii.ac.jp/1291/00002793/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2793&item_no=1&attribute_id=18&file_no=1 |
geographic |
Victoria Land |
geographic_facet |
Victoria Land |
genre |
Antarc* Antarctica Victoria Land |
genre_facet |
Antarc* Antarctica Victoria Land |
op_relation |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2793 http://id.nii.ac.jp/1291/00002793/ AA1072335X Proceedings of the NIPR Symposium on Antarctic Geosciences, 8, 160-168(1995-09) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2793&item_no=1&attribute_id=18&file_no=1 |
_version_ |
1766250313590767616 |