Geochemistry of the pre/syn-metamorphic granite in the Ongul Islands, East Antarctica
Latest Proterozoic to Early Paleozoic pre/syn- and post-metamorphic granites occur in the Lutzow-Holm Complex (LHC), East Antarctica. The pre/syn-metamorphic granites in the Ongul Islands consist of biotite hornblende (BH) granite and garnet biotite hornblende (GBH) granite. The Rb-Sr whole rock iso...
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Faculty of Culture and Education, Saga University
2005
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ftnipr:oai:nipr.repo.nii.ac.jp:00003154 2023-05-15T13:49:00+02:00 Geochemistry of the pre/syn-metamorphic granite in the Ongul Islands, East Antarctica Yoshinobu Kawano Akihiro Meno Naoko Nishi Hiroo Kagami 2005-10 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=3154 http://id.nii.ac.jp/1291/00003154/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=3154&item_no=1&attribute_id=18&file_no=1 en eng Faculty of Culture and Education, Saga University Karatsu 5th Junior High School Yamagata City Graduate School of Science and Technology, Niigata University National Institute of Polar Research https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=3154 http://id.nii.ac.jp/1291/00003154/ AA1130866X Polar geoscience, 18, 114-129(2005-10) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=3154&item_no=1&attribute_id=18&file_no=1 granite geochemistry isotope Ongul Islands Lutzow-Holm Complex Departmental Bulletin Paper P(論文) 2005 ftnipr 2022-12-03T19:43:04Z Latest Proterozoic to Early Paleozoic pre/syn- and post-metamorphic granites occur in the Lutzow-Holm Complex (LHC), East Antarctica. The pre/syn-metamorphic granites in the Ongul Islands consist of biotite hornblende (BH) granite and garnet biotite hornblende (GBH) granite. The Rb-Sr whole rock isochron age of 580±23Ma with an initial ^(87)Sr/^(86)Sr ratio of 0.70784±0.00059 is obtained from the BH granite. This age is slightly older than SHRIMP U-Pb zircon and CHIME monazite metamorphic ages (520-550Ma) from the complex. The BH granite has lower aluminum saturation index than the GBH granite. The pre/syn-metamorphic granites have a wide variation of εSr and εNd values at 580m.y. before the present, and the BH granite has lower εSr_(580Ma) and higher εNd_(580Ma) values than the GBH granite. One end of the variations in the ε diagram is close to the values of the mafic to intermediate metamorphic rocks in the island; the other is close to those of the old continental crust. These geochemical and isotopic features suggest that the PSMGs were originated by mixing between magma derived from mafic to intermediate metamorphic rocks and old continental crust. Report Antarc* Antarctica East Antarctica Polar geoscience National Institute of Polar Research Repository, Japan East Antarctica Ongul ENVELOPE(39.533,39.533,-69.017,-69.017) |
institution |
Open Polar |
collection |
National Institute of Polar Research Repository, Japan |
op_collection_id |
ftnipr |
language |
English |
topic |
granite geochemistry isotope Ongul Islands Lutzow-Holm Complex |
spellingShingle |
granite geochemistry isotope Ongul Islands Lutzow-Holm Complex Yoshinobu Kawano Akihiro Meno Naoko Nishi Hiroo Kagami Geochemistry of the pre/syn-metamorphic granite in the Ongul Islands, East Antarctica |
topic_facet |
granite geochemistry isotope Ongul Islands Lutzow-Holm Complex |
description |
Latest Proterozoic to Early Paleozoic pre/syn- and post-metamorphic granites occur in the Lutzow-Holm Complex (LHC), East Antarctica. The pre/syn-metamorphic granites in the Ongul Islands consist of biotite hornblende (BH) granite and garnet biotite hornblende (GBH) granite. The Rb-Sr whole rock isochron age of 580±23Ma with an initial ^(87)Sr/^(86)Sr ratio of 0.70784±0.00059 is obtained from the BH granite. This age is slightly older than SHRIMP U-Pb zircon and CHIME monazite metamorphic ages (520-550Ma) from the complex. The BH granite has lower aluminum saturation index than the GBH granite. The pre/syn-metamorphic granites have a wide variation of εSr and εNd values at 580m.y. before the present, and the BH granite has lower εSr_(580Ma) and higher εNd_(580Ma) values than the GBH granite. One end of the variations in the ε diagram is close to the values of the mafic to intermediate metamorphic rocks in the island; the other is close to those of the old continental crust. These geochemical and isotopic features suggest that the PSMGs were originated by mixing between magma derived from mafic to intermediate metamorphic rocks and old continental crust. |
format |
Report |
author |
Yoshinobu Kawano Akihiro Meno Naoko Nishi Hiroo Kagami |
author_facet |
Yoshinobu Kawano Akihiro Meno Naoko Nishi Hiroo Kagami |
author_sort |
Yoshinobu Kawano |
title |
Geochemistry of the pre/syn-metamorphic granite in the Ongul Islands, East Antarctica |
title_short |
Geochemistry of the pre/syn-metamorphic granite in the Ongul Islands, East Antarctica |
title_full |
Geochemistry of the pre/syn-metamorphic granite in the Ongul Islands, East Antarctica |
title_fullStr |
Geochemistry of the pre/syn-metamorphic granite in the Ongul Islands, East Antarctica |
title_full_unstemmed |
Geochemistry of the pre/syn-metamorphic granite in the Ongul Islands, East Antarctica |
title_sort |
geochemistry of the pre/syn-metamorphic granite in the ongul islands, east antarctica |
publisher |
Faculty of Culture and Education, Saga University |
publishDate |
2005 |
url |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=3154 http://id.nii.ac.jp/1291/00003154/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=3154&item_no=1&attribute_id=18&file_no=1 |
long_lat |
ENVELOPE(39.533,39.533,-69.017,-69.017) |
geographic |
East Antarctica Ongul |
geographic_facet |
East Antarctica Ongul |
genre |
Antarc* Antarctica East Antarctica Polar geoscience |
genre_facet |
Antarc* Antarctica East Antarctica Polar geoscience |
op_relation |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=3154 http://id.nii.ac.jp/1291/00003154/ AA1130866X Polar geoscience, 18, 114-129(2005-10) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=3154&item_no=1&attribute_id=18&file_no=1 |
_version_ |
1766250368168099840 |