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Article type: Photogravure
1987 Volume 32 Issue 2 Pages
App2-
Published: July 01, 1987
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Jun SATO, Toshihiro NAKAMURA, Haruo TAKAHASHI
Article type: Article
1987 Volume 32 Issue 2 Pages
95-102
Published: July 01, 1987
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Chemical analysis for major and minor elements was performed on scoria fall deposits, essential blocks in the pyroclastic flow dcposit and lavas produced by the 1108 eruption of Asama volcano. The results showed that these volcanic products vvere nearly of uniform elemental composition, though the erupting magma tended to be slightly mafic towards the end of the activity. “Shimo-no-Butai lava” which is one of the two lava flows erupted at the mid stage of this activity showed rather felslc composition than other products, Implying a possibillty that an eruption or a contamination of magma different in chemical composition occurred during the eruptive event.
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Takaaki FUKUKA, Fusao ARAI, Fumihiko NISHIO
Article type: Article
1987 Volume 32 Issue 2 Pages
103-118
Published: July 01, 1987
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A large number of meteorites have been discovered in the bare ice areas of the Yamato Mountains and the Allan Hills, Antarctica. There are many dirt layers in these areas. It was confirmed recently that the dirt layer consists of tephra layers. As one tephra layer is considered to have been produced by asingle volcanic event, the age of ice can be estimated from the age of the tephra layers. Hence, a tephra layer can serve as a possible time marker of the ice. Therefore, it is possible to indirectly detemine the age of meteorite fall from tephra layers. One dirt layer is composed of ice with dispersed ash grains and its thickness is a few cm~10cm. From this thickness of ice, it is implied that tephra was supplied continuously over 1 year from a source volcano. Because a large scale eruption of a volcano usually does not continue for such a long period, a thick dirt layer may be a composite of tephra layers from multiple eruptions. In order to examine whether the tephras present in ice are products of a single eruption or multiple eruptions, the chemical abundances of more than 20 elements and the refractive indices of glass shards in the thin slabs of a dirt layer were determined by instrumental neutron activation analysis (INAA) and the phase-contrast technique, respectively. Those of glass shards separated magnetically from a dirt layer were also determined. INAA of the glass shards separated from 3 dirt layers in the Yamato Mountains area and 5 dirt layers in the Allan Hills area were carried out to test the correlation techniques for tephra layers in the Antarctic ice. The refractive indices of them were also determined. The results of these measurements show that most of dirt layers consist of a single fall unit of tephra, except one dirt layer in the Allan Hills area. The tephra layers in the Yamato Mountains area were divided into 2, and the tephra layers in the Allan Hills area were divided into 4. The source volcanoes of the tephras in the Yamato Momtains area, which is composed of island arc tholeiite, should lie on the South Sandwich Islands. The sources of those in the Allan Hills area which is composed of alkalic rocks, should be in the McMurdo Sound area. Trace element abundances and refractive indices of glass shards are useful tools for correlation of tephras in the Antarctic ice.
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Shigeru SUTO
Article type: Letter
1987 Volume 32 Issue 2 Pages
119-121
Published: July 01, 1987
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Masao YAMASAKI, Shigeko TOGASHI, Ichio MRIYA, Satoshi SHIMlZU
Article type: Letter
1987 Volume 32 Issue 2 Pages
123-124
Published: July 01, 1987
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Akira KUBOTERA
Article type: Letter
1987 Volume 32 Issue 2 Pages
125-129
Published: July 01, 1987
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Yoshihiro SAWADA, Shigeru SUTO, Minoru KASAHARA
Article type: Scientific Communication
1987 Volume 32 Issue 2 Pages
131-136
Published: July 01, 1987
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M. HASHIZUME
Article type: Article
1987 Volume 32 Issue 2 Pages
137-
Published: July 01, 1987
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K. Kurita, M. Kumazawa, T. Fujii
Article type: Abstract
1987 Volume 32 Issue 2 Pages
138-
Published: July 01, 1987
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K. Kaminuma, J. Amino, S. Miura
Article type: Abstract
1987 Volume 32 Issue 2 Pages
138-
Published: July 01, 1987
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T. Watanabe, K. Kurita
Article type: Abstract
1987 Volume 32 Issue 2 Pages
139-
Published: July 01, 1987
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S. Hayashi, M. Kasahara, M. Seto, K. Tanaka, M.S. Kamba, N. Zana
Article type: Abstract
1987 Volume 32 Issue 2 Pages
139-
Published: July 01, 1987
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S. Arai
Article type: Abstract
1987 Volume 32 Issue 2 Pages
139-
Published: July 01, 1987
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M. Tanahashi, S. Oyama, N. Murayama, M. Hirokawa
Article type: Abstract
1987 Volume 32 Issue 2 Pages
140-
Published: July 01, 1987
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N. Takahashi, S. Arai
Article type: Abstract
1987 Volume 32 Issue 2 Pages
140-
Published: July 01, 1987
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M. Tanahashi, S. Oyama, N. Murayama, M. Hirokawa
Article type: Abstract
1987 Volume 32 Issue 2 Pages
141-
Published: July 01, 1987
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Y. Tatsumi, S. Maruyama
Article type: Abstract
1987 Volume 32 Issue 2 Pages
141-
Published: July 01, 1987
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T. Koyaguchi
Article type: Abstract
1987 Volume 32 Issue 2 Pages
142-
Published: July 01, 1987
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Y. Kato
Article type: Abstract
1987 Volume 32 Issue 2 Pages
142-
Published: July 01, 1987
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M. Obata
Article type: Abstract
1987 Volume 32 Issue 2 Pages
142-
Published: July 01, 1987
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Y. Kato
Article type: Abstract
1987 Volume 32 Issue 2 Pages
143-
Published: July 01, 1987
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A. Takada
Article type: Abstract
1987 Volume 32 Issue 2 Pages
143-
Published: July 01, 1987
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N. Yoshida
Article type: Abstract
1987 Volume 32 Issue 2 Pages
144-
Published: July 01, 1987
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N. Fujii, T. Nakano
Article type: Abstract
1987 Volume 32 Issue 2 Pages
144-
Published: July 01, 1987
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S. Umino
Article type: Abstract
1987 Volume 32 Issue 2 Pages
145-
Published: July 01, 1987
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A. Toramaru
Article type: Abstract
1987 Volume 32 Issue 2 Pages
145-
Published: July 01, 1987
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T. Gamo, H. Sakai, J. Ishibashi, H. Masuda, M. Kodera, G. Igarashi, M. ...
Article type: Abstract
1987 Volume 32 Issue 2 Pages
145-
Published: July 01, 1987
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A. Toramaru
Article type: Abstracts of Papers submitted for the Meetings of the Society
1987 Volume 32 Issue 2 Pages
146-
Published: July 01, 1987
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Y. Takigami, I. Kaneoka, T. Ishii, Y. Nakamura
Article type: Abstract
1987 Volume 32 Issue 2 Pages
146-
Published: July 01, 1987
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H. Sato
Article type: Abstract
1987 Volume 32 Issue 2 Pages
147-
Published: July 01, 1987
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E. Takahashi, T. Katsura, T.L. Wright
Article type: Abstract
1987 Volume 32 Issue 2 Pages
147-
Published: July 01, 1987
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K. Noguchi, S. Nakada
Article type: Abstract
1987 Volume 32 Issue 2 Pages
148-
Published: July 01, 1987
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Y. Nishimura, Hm. Okada
Article type: Abstract
1987 Volume 32 Issue 2 Pages
148-
Published: July 01, 1987
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H. Hoshizumi, K. Ono
Article type: Abstract
1987 Volume 32 Issue 2 Pages
148-
Published: July 01, 1987
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N. Matsushima, Y. Nishimura, H. Okada
Article type: Abstract
1987 Volume 32 Issue 2 Pages
149-
Published: July 01, 1987
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T. Koyaguchi, H. Matsuura
Article type: Abstract
1987 Volume 32 Issue 2 Pages
149-
Published: July 01, 1987
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H. Miyamachi, A. Suzuki, T. Maekawa, H. Mori, Hm. Okada
Article type: Abstract
1987 Volume 32 Issue 2 Pages
150-
Published: July 01, 1987
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T. Mizuta, K. Egami, M. Obata
Article type: Abstract
1987 Volume 32 Issue 2 Pages
150-
Published: July 01, 1987
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H.Y. Mori, A. Suzuki
Article type: Abstract
1987 Volume 32 Issue 2 Pages
151-
Published: July 01, 1987
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T. Ui, M. Takeuchi
Article type: Abstract
1987 Volume 32 Issue 2 Pages
151-
Published: July 01, 1987
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T. Eto, H. Shimizu
Article type: Abstract
1987 Volume 32 Issue 2 Pages
152-
Published: July 01, 1987
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M Sumita, K. Endo, R. Uno
Article type: Abstract
1987 Volume 32 Issue 2 Pages
152-
Published: July 01, 1987
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T Mogi, K. Yuhara, K. Nakama, M. Shimoizumi
Article type: Abstract
1987 Volume 32 Issue 2 Pages
152-
Published: July 01, 1987
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T. Kobayashi
Article type: Abstract
1987 Volume 32 Issue 2 Pages
153-
Published: July 01, 1987
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Edy M. Arsadi, Susumu Nishimura, Ikuo Katsura, Tohru Mogi
Article type: Abstract
1987 Volume 32 Issue 2 Pages
153-154
Published: July 01, 1987
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S. Hayashi, H. Ootomo
Article type: Abstract
1987 Volume 32 Issue 2 Pages
154-
Published: July 01, 1987
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M. Churei, H. Yamasato, M. Takeo, M. Ohashi, K. Uhira
Article type: Abstract
1987 Volume 32 Issue 2 Pages
154-
Published: July 01, 1987
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M. Nakagawa, H. Shimotori, T. Yoshida
Article type: Abstract
1987 Volume 32 Issue 2 Pages
154-155
Published: July 01, 1987
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M. Takeo, H. Yamasato, M. Churei, K. Uhira
Article type: Abstract
1987 Volume 32 Issue 2 Pages
155-
Published: July 01, 1987
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T. Yamamoto, Y. Yanagisawa
Article type: Abstract
1987 Volume 32 Issue 2 Pages
155-156
Published: July 01, 1987
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