Search for the extra-terrestrial materials in deep sea sediments
In order to characterize He carrier in deep sea sediments, we magnetically separated the deep sea sediments collected at three different sites, and measured the ^3He/^4He ratio and the He content in each fraction. The ^3He/^4He ratios (1.4-2.4×(10)^<-4>) and the He content (^3He : 1.6-10.7×(10...
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Geophysical Institute, University of Tokyo
1986
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ftnipr:oai:nipr.repo.nii.ac.jp:00001976 2023-05-15T17:10:59+02:00 Search for the extra-terrestrial materials in deep sea sediments Sachiko Amari Minoru Ozima Mineo Imamura 1986-07 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=1976 http://id.nii.ac.jp/1291/00001976/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1976&item_no=1&attribute_id=18&file_no=1 en eng Geophysical Institute, University of Tokyo Institute for Nuclear Study, University of Tokyo https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=1976 http://id.nii.ac.jp/1291/00001976/ AA00733561 Memoirs of National Institute of Polar Research. Special issue, 41, 338-347(1986-07) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1976&item_no=1&attribute_id=18&file_no=1 Departmental Bulletin Paper P(論文) 1986 ftnipr 2022-11-12T19:42:46Z In order to characterize He carrier in deep sea sediments, we magnetically separated the deep sea sediments collected at three different sites, and measured the ^3He/^4He ratio and the He content in each fraction. The ^3He/^4He ratios (1.4-2.4×(10)^<-4>) and the He content (^3He : 1.6-10.7×(10)^<-9>(cm)^3 STP/g) in the magnetic fractions were high, which reveals that the He carrier was concentrated in the magnetic fractions. The ferromagnetic property of the He carrier may be due to magnetite which had been produced by decomposition of poorly crystallized silicates in the He carrier during their atmospheric entry. Stepwise heating experiment was applied to one of the magnetic fractions. The ^3He/^4He ratios were almost the same (2×(10)^<-4>) in each temperature fraction and the single activation energy, 17kcal/mol was obtained. The result strongly suggests that the observed He is of a single component. Thermomagnetic analyses gave us the information that the major part of the magnetic fractions is terrestrial titanomagnetite. The amount of ^<53>Mn in the magnetic fractions was measured by the RNAA method. However, the large amount of ^<55>Mn allowed us only to estimate the upper limits of the amount of ^<53>Mn. Report Memoirs of National Institute of Polar Research Polar Research National Institute of Polar Research Repository, Japan |
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National Institute of Polar Research Repository, Japan |
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English |
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In order to characterize He carrier in deep sea sediments, we magnetically separated the deep sea sediments collected at three different sites, and measured the ^3He/^4He ratio and the He content in each fraction. The ^3He/^4He ratios (1.4-2.4×(10)^<-4>) and the He content (^3He : 1.6-10.7×(10)^<-9>(cm)^3 STP/g) in the magnetic fractions were high, which reveals that the He carrier was concentrated in the magnetic fractions. The ferromagnetic property of the He carrier may be due to magnetite which had been produced by decomposition of poorly crystallized silicates in the He carrier during their atmospheric entry. Stepwise heating experiment was applied to one of the magnetic fractions. The ^3He/^4He ratios were almost the same (2×(10)^<-4>) in each temperature fraction and the single activation energy, 17kcal/mol was obtained. The result strongly suggests that the observed He is of a single component. Thermomagnetic analyses gave us the information that the major part of the magnetic fractions is terrestrial titanomagnetite. The amount of ^<53>Mn in the magnetic fractions was measured by the RNAA method. However, the large amount of ^<55>Mn allowed us only to estimate the upper limits of the amount of ^<53>Mn. |
format |
Report |
author |
Sachiko Amari Minoru Ozima Mineo Imamura |
spellingShingle |
Sachiko Amari Minoru Ozima Mineo Imamura Search for the extra-terrestrial materials in deep sea sediments |
author_facet |
Sachiko Amari Minoru Ozima Mineo Imamura |
author_sort |
Sachiko Amari |
title |
Search for the extra-terrestrial materials in deep sea sediments |
title_short |
Search for the extra-terrestrial materials in deep sea sediments |
title_full |
Search for the extra-terrestrial materials in deep sea sediments |
title_fullStr |
Search for the extra-terrestrial materials in deep sea sediments |
title_full_unstemmed |
Search for the extra-terrestrial materials in deep sea sediments |
title_sort |
search for the extra-terrestrial materials in deep sea sediments |
publisher |
Geophysical Institute, University of Tokyo |
publishDate |
1986 |
url |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=1976 http://id.nii.ac.jp/1291/00001976/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1976&item_no=1&attribute_id=18&file_no=1 |
genre |
Memoirs of National Institute of Polar Research Polar Research |
genre_facet |
Memoirs of National Institute of Polar Research Polar Research |
op_relation |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=1976 http://id.nii.ac.jp/1291/00001976/ AA00733561 Memoirs of National Institute of Polar Research. Special issue, 41, 338-347(1986-07) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1976&item_no=1&attribute_id=18&file_no=1 |
_version_ |
1766067787429576704 |