Strontium Isotopic Studies of the Ross Island Volcanics, Antarctica
The isotopic composition of strontium has been determined for samples from DVDP #1 and #2 from Ross Island. It covers the range of olivine basalt, titanaugite-hornblende basalt, hornblende-titanaugite trachy-basalt and hornblende trachyte. The ^<87>Sr/^<86>Sr ratio for the M. I. T. Eimer...
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Geochemical Research Section, Geological Survey of Japan
1975
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ftnipr:oai:nipr.repo.nii.ac.jp:00000821 2023-05-15T13:47:58+02:00 Strontium Isotopic Studies of the Ross Island Volcanics, Antarctica Hajime Kurasawa 1975-02 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=821 http://id.nii.ac.jp/1291/00000821/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=821&item_no=1&attribute_id=18&file_no=1 en eng Geochemical Research Section, Geological Survey of Japan https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=821 http://id.nii.ac.jp/1291/00000821/ AA00733561 Memoirs of National Institute of Polar Research. Special issue, 4, 67-74(1975-02) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=821&item_no=1&attribute_id=18&file_no=1 Departmental Bulletin Paper P(論文) 1975 ftnipr 2022-11-12T19:41:42Z The isotopic composition of strontium has been determined for samples from DVDP #1 and #2 from Ross Island. It covers the range of olivine basalt, titanaugite-hornblende basalt, hornblende-titanaugite trachy-basalt and hornblende trachyte. The ^<87>Sr/^<86>Sr ratio for the M. I. T. Eimer and Amend reagent SrCO_3 standard determined in our laboratory is 0.7079±0.0001. The basaltic rocks appear to be comagmatic with similar low initial ^<87>Sr/^<86>Sr ratios around 0.7035. This ratio is comparable with ratios of the other alkaline rock series of oceanic islands. The trachytes have initial ratios significantly higher than the basaltic rocks. Compared to the basaltic rocks, the trachytes are enriched in K, Si, Al, Na and Rb and depleted in Ca, Fe, Mg, Ti and Sr. Contamination by submarine sediments and/or by crustal rocks could explain the initial ^<87>Sr/^<86>Sr ratio, but it does not account for the peculiarities in chemistry which characterize the trachytes. The chemical characteristics of the trachytes and the initial ^<87>Sr/^<86>Sr ratio can be explained by deriving the trachytes from older igneous rocks due to partial melting of the latter's alkali feldspar-rich portion. However, this model raises problems regarding the nature of parental material. Report Antarc* Antarctica Memoirs of National Institute of Polar Research Polar Research Ross Island National Institute of Polar Research Repository, Japan Ross Island |
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Open Polar |
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National Institute of Polar Research Repository, Japan |
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ftnipr |
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English |
description |
The isotopic composition of strontium has been determined for samples from DVDP #1 and #2 from Ross Island. It covers the range of olivine basalt, titanaugite-hornblende basalt, hornblende-titanaugite trachy-basalt and hornblende trachyte. The ^<87>Sr/^<86>Sr ratio for the M. I. T. Eimer and Amend reagent SrCO_3 standard determined in our laboratory is 0.7079±0.0001. The basaltic rocks appear to be comagmatic with similar low initial ^<87>Sr/^<86>Sr ratios around 0.7035. This ratio is comparable with ratios of the other alkaline rock series of oceanic islands. The trachytes have initial ratios significantly higher than the basaltic rocks. Compared to the basaltic rocks, the trachytes are enriched in K, Si, Al, Na and Rb and depleted in Ca, Fe, Mg, Ti and Sr. Contamination by submarine sediments and/or by crustal rocks could explain the initial ^<87>Sr/^<86>Sr ratio, but it does not account for the peculiarities in chemistry which characterize the trachytes. The chemical characteristics of the trachytes and the initial ^<87>Sr/^<86>Sr ratio can be explained by deriving the trachytes from older igneous rocks due to partial melting of the latter's alkali feldspar-rich portion. However, this model raises problems regarding the nature of parental material. |
format |
Report |
author |
Hajime Kurasawa |
spellingShingle |
Hajime Kurasawa Strontium Isotopic Studies of the Ross Island Volcanics, Antarctica |
author_facet |
Hajime Kurasawa |
author_sort |
Hajime Kurasawa |
title |
Strontium Isotopic Studies of the Ross Island Volcanics, Antarctica |
title_short |
Strontium Isotopic Studies of the Ross Island Volcanics, Antarctica |
title_full |
Strontium Isotopic Studies of the Ross Island Volcanics, Antarctica |
title_fullStr |
Strontium Isotopic Studies of the Ross Island Volcanics, Antarctica |
title_full_unstemmed |
Strontium Isotopic Studies of the Ross Island Volcanics, Antarctica |
title_sort |
strontium isotopic studies of the ross island volcanics, antarctica |
publisher |
Geochemical Research Section, Geological Survey of Japan |
publishDate |
1975 |
url |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=821 http://id.nii.ac.jp/1291/00000821/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=821&item_no=1&attribute_id=18&file_no=1 |
geographic |
Ross Island |
geographic_facet |
Ross Island |
genre |
Antarc* Antarctica Memoirs of National Institute of Polar Research Polar Research Ross Island |
genre_facet |
Antarc* Antarctica Memoirs of National Institute of Polar Research Polar Research Ross Island |
op_relation |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=821 http://id.nii.ac.jp/1291/00000821/ AA00733561 Memoirs of National Institute of Polar Research. Special issue, 4, 67-74(1975-02) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=821&item_no=1&attribute_id=18&file_no=1 |
_version_ |
1766248210402115584 |