Petrochemical character of the syenitic rocks from the Yamato Mountains, East Antarctica
Syenitic rocks occupying an area of at least 400(km)^2 in the Yamato Mountains, East Antarctica, are classified into three major types on the basis of the field occurrence and petrography; two-pyroxene syenite, clinopyroxene quartz monzo-syenite and clinopyroxene syenite. Major and trace elements Rb...
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National Institute of Polar Research/Department of Geological Sciences, College of Liberal Arts, Okayama University/Geological Survey of Japan
1983
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ftnipr:oai:nipr.repo.nii.ac.jp:00001476 2023-05-15T13:47:59+02:00 Petrochemical character of the syenitic rocks from the Yamato Mountains, East Antarctica Kazuyuki Shiraishi Masao Asami Hiroshi Kanaya 1983-10 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=1476 http://id.nii.ac.jp/1291/00001476/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1476&item_no=1&attribute_id=18&file_no=1 en eng National Institute of Polar Research/Department of Geological Sciences, College of Liberal Arts, Okayama University/Geological Survey of Japan https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=1476 http://id.nii.ac.jp/1291/00001476/ AA00733561 Memoirs of National Institute of Polar Research. Special issue, 28, 183-197(1983-10) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1476&item_no=1&attribute_id=18&file_no=1 Departmental Bulletin Paper P(論文) 1983 ftnipr 2022-11-12T19:42:17Z Syenitic rocks occupying an area of at least 400(km)^2 in the Yamato Mountains, East Antarctica, are classified into three major types on the basis of the field occurrence and petrography; two-pyroxene syenite, clinopyroxene quartz monzo-syenite and clinopyroxene syenite. Major and trace elements Rb, Sr, Zr, Th and U are presented to reveal the petrochemical features of the syenitic rocks. The two-pyroxene syenite which has a charnockitic appearance is the earlier member among the syenitic rocks. The spacial relation between the clinopyroxene quartz monzo-syenite and the clinopyroxene syenite is not observed. All the syenitic rocks show roughly smooth trends in the major elements variation diagrams, but they overlap extensively with increasing SiO_2. The Rb, Th and U contents of the syenitic rocks are similar to those of the average crust, and Sr and Zr are much more enriched than the ordinary granitic rocks. The wide range of SiO_2 in the clinopyroxene quartz monzo-syenite and higher Rb/Sr and K/Rb ratios in the two-pyroxene syenite than the former might not prove the formation of the clinopyroxene quartz monzo-syenite from the two-pyroxene syenite by magmatic differentiation. On the other hand, it is possible that the clinopyroxene quartz monzo-syenite and the clinopyroxene syenite may be genetically related judging from their petrochemical similarity. Report Antarc* Antarctica East Antarctica Memoirs of National Institute of Polar Research Polar Research National Institute of Polar Research Repository, Japan East Antarctica Yamato ENVELOPE(35.583,35.583,-71.417,-71.417) |
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Open Polar |
collection |
National Institute of Polar Research Repository, Japan |
op_collection_id |
ftnipr |
language |
English |
description |
Syenitic rocks occupying an area of at least 400(km)^2 in the Yamato Mountains, East Antarctica, are classified into three major types on the basis of the field occurrence and petrography; two-pyroxene syenite, clinopyroxene quartz monzo-syenite and clinopyroxene syenite. Major and trace elements Rb, Sr, Zr, Th and U are presented to reveal the petrochemical features of the syenitic rocks. The two-pyroxene syenite which has a charnockitic appearance is the earlier member among the syenitic rocks. The spacial relation between the clinopyroxene quartz monzo-syenite and the clinopyroxene syenite is not observed. All the syenitic rocks show roughly smooth trends in the major elements variation diagrams, but they overlap extensively with increasing SiO_2. The Rb, Th and U contents of the syenitic rocks are similar to those of the average crust, and Sr and Zr are much more enriched than the ordinary granitic rocks. The wide range of SiO_2 in the clinopyroxene quartz monzo-syenite and higher Rb/Sr and K/Rb ratios in the two-pyroxene syenite than the former might not prove the formation of the clinopyroxene quartz monzo-syenite from the two-pyroxene syenite by magmatic differentiation. On the other hand, it is possible that the clinopyroxene quartz monzo-syenite and the clinopyroxene syenite may be genetically related judging from their petrochemical similarity. |
format |
Report |
author |
Kazuyuki Shiraishi Masao Asami Hiroshi Kanaya |
spellingShingle |
Kazuyuki Shiraishi Masao Asami Hiroshi Kanaya Petrochemical character of the syenitic rocks from the Yamato Mountains, East Antarctica |
author_facet |
Kazuyuki Shiraishi Masao Asami Hiroshi Kanaya |
author_sort |
Kazuyuki Shiraishi |
title |
Petrochemical character of the syenitic rocks from the Yamato Mountains, East Antarctica |
title_short |
Petrochemical character of the syenitic rocks from the Yamato Mountains, East Antarctica |
title_full |
Petrochemical character of the syenitic rocks from the Yamato Mountains, East Antarctica |
title_fullStr |
Petrochemical character of the syenitic rocks from the Yamato Mountains, East Antarctica |
title_full_unstemmed |
Petrochemical character of the syenitic rocks from the Yamato Mountains, East Antarctica |
title_sort |
petrochemical character of the syenitic rocks from the yamato mountains, east antarctica |
publisher |
National Institute of Polar Research/Department of Geological Sciences, College of Liberal Arts, Okayama University/Geological Survey of Japan |
publishDate |
1983 |
url |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=1476 http://id.nii.ac.jp/1291/00001476/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1476&item_no=1&attribute_id=18&file_no=1 |
long_lat |
ENVELOPE(35.583,35.583,-71.417,-71.417) |
geographic |
East Antarctica Yamato |
geographic_facet |
East Antarctica Yamato |
genre |
Antarc* Antarctica East Antarctica Memoirs of National Institute of Polar Research Polar Research |
genre_facet |
Antarc* Antarctica East Antarctica Memoirs of National Institute of Polar Research Polar Research |
op_relation |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=1476 http://id.nii.ac.jp/1291/00001476/ AA00733561 Memoirs of National Institute of Polar Research. Special issue, 28, 183-197(1983-10) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1476&item_no=1&attribute_id=18&file_no=1 |
_version_ |
1766248278473572352 |