Petrology, geochemistry, and geochronology of plutonic rocks from the present Southwest Indian Ridge: Implications for dropstone distribution in the Indian Ocean
We recovered sedimentary and plutonic rocks from the off-ridge portion of the Southwest Indian Ridge (37°00.02ʹ E, 44°49.73ʹ S, 2165 m deep). The petrography, geochemistry, and geochronology of these plutonic rocks were analyzed. Ar–Ar dating of biotite in the plutonic rocks yielded early Paleozoic...
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2021
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ftnipr:oai:nipr.repo.nii.ac.jp:00016832 2023-05-15T13:49:00+02:00 Petrology, geochemistry, and geochronology of plutonic rocks from the present Southwest Indian Ridge: Implications for dropstone distribution in the Indian Ocean 2021-09 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=16832 http://id.nii.ac.jp/1291/00016702/ en eng https://doi.org/10.1016/j.polar.2021.100725 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=16832 http://id.nii.ac.jp/1291/00016702/ Polar Science, 29, 100725(2021-09) 18739652 Southwest Indian Ridge Petrology Southern Ocean Orogeny Dropstones Journal Article 2021 ftnipr https://doi.org/10.1016/j.polar.2021.100725 2022-12-03T19:43:21Z We recovered sedimentary and plutonic rocks from the off-ridge portion of the Southwest Indian Ridge (37°00.02ʹ E, 44°49.73ʹ S, 2165 m deep). The petrography, geochemistry, and geochronology of these plutonic rocks were analyzed. Ar–Ar dating of biotite in the plutonic rocks yielded early Paleozoic ages of approximately 475 and 490 Ma, indicating that these rocks are likely related to Antarctic orogenies during the late Neoproterozoic to early Paleozoic. In addition, the samples exhibited trace element compositions and low initial εNd values (−8 and −12) similar to those of rocks from western Dronning Maud Land and the Transantarctic Mountains, Antarctica. Such similarities suggest that these plutonic rocks from the off-ridge portion of the Southwest Indian ridge were derived from western Dronning Maud Land or the Transantarctic Mountains and deposited by melting icebergs as dropstones. Article in Journal/Newspaper Antarc* Antarctic Antarctica Dronning Maud Land Iceberg* Polar Science Polar Science Southern Ocean National Institute of Polar Research Repository, Japan Antarctic Southern Ocean Dronning Maud Land Transantarctic Mountains Indian Polar Science 29 100725 |
institution |
Open Polar |
collection |
National Institute of Polar Research Repository, Japan |
op_collection_id |
ftnipr |
language |
English |
topic |
Southwest Indian Ridge Petrology Southern Ocean Orogeny Dropstones |
spellingShingle |
Southwest Indian Ridge Petrology Southern Ocean Orogeny Dropstones Petrology, geochemistry, and geochronology of plutonic rocks from the present Southwest Indian Ridge: Implications for dropstone distribution in the Indian Ocean |
topic_facet |
Southwest Indian Ridge Petrology Southern Ocean Orogeny Dropstones |
description |
We recovered sedimentary and plutonic rocks from the off-ridge portion of the Southwest Indian Ridge (37°00.02ʹ E, 44°49.73ʹ S, 2165 m deep). The petrography, geochemistry, and geochronology of these plutonic rocks were analyzed. Ar–Ar dating of biotite in the plutonic rocks yielded early Paleozoic ages of approximately 475 and 490 Ma, indicating that these rocks are likely related to Antarctic orogenies during the late Neoproterozoic to early Paleozoic. In addition, the samples exhibited trace element compositions and low initial εNd values (−8 and −12) similar to those of rocks from western Dronning Maud Land and the Transantarctic Mountains, Antarctica. Such similarities suggest that these plutonic rocks from the off-ridge portion of the Southwest Indian ridge were derived from western Dronning Maud Land or the Transantarctic Mountains and deposited by melting icebergs as dropstones. |
format |
Article in Journal/Newspaper |
title |
Petrology, geochemistry, and geochronology of plutonic rocks from the present Southwest Indian Ridge: Implications for dropstone distribution in the Indian Ocean |
title_short |
Petrology, geochemistry, and geochronology of plutonic rocks from the present Southwest Indian Ridge: Implications for dropstone distribution in the Indian Ocean |
title_full |
Petrology, geochemistry, and geochronology of plutonic rocks from the present Southwest Indian Ridge: Implications for dropstone distribution in the Indian Ocean |
title_fullStr |
Petrology, geochemistry, and geochronology of plutonic rocks from the present Southwest Indian Ridge: Implications for dropstone distribution in the Indian Ocean |
title_full_unstemmed |
Petrology, geochemistry, and geochronology of plutonic rocks from the present Southwest Indian Ridge: Implications for dropstone distribution in the Indian Ocean |
title_sort |
petrology, geochemistry, and geochronology of plutonic rocks from the present southwest indian ridge: implications for dropstone distribution in the indian ocean |
publishDate |
2021 |
url |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=16832 http://id.nii.ac.jp/1291/00016702/ |
geographic |
Antarctic Southern Ocean Dronning Maud Land Transantarctic Mountains Indian |
geographic_facet |
Antarctic Southern Ocean Dronning Maud Land Transantarctic Mountains Indian |
genre |
Antarc* Antarctic Antarctica Dronning Maud Land Iceberg* Polar Science Polar Science Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica Dronning Maud Land Iceberg* Polar Science Polar Science Southern Ocean |
op_relation |
https://doi.org/10.1016/j.polar.2021.100725 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=16832 http://id.nii.ac.jp/1291/00016702/ Polar Science, 29, 100725(2021-09) 18739652 |
op_doi |
https://doi.org/10.1016/j.polar.2021.100725 |
container_title |
Polar Science |
container_volume |
29 |
container_start_page |
100725 |
_version_ |
1766250396310831104 |