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Hajime KURASAWA
Article type: Article
1979 Volume 24 Issue 3 Pages
135-152
Published: October 01, 1979
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The Fuji, Hakone and Izu Quaternary volcanic area has been divided petrographycally into three zones which lie parallel to the Izu-Mariana arc. From east to west they are characterized respectively by the presence of the low-alkali tholeiite, high-alkali tholeiite, and alkali basalt (Fig.1). A marked contrast is seen geochemically between the rocks on the volcanic front (the east zone), and those of the western zones in that low-alkali tholeiite of the east zone is low in Sr content (150-300ppm), and high K/Rb ratio (1, 000). There is a good positive correlation between the Sr content and the distance from the volcanic front (Fig.5). The initial
87Sr/
86Sr rations in the volcanic rocks from the Fuji, Hakone, and Izu area, lie in the range 0.703 to 0.704 (average very close to 0.7035). These geochemical evidences and isotopic ratios are characteristic of the rocks from most of the young island arcs. In the case of the in situ differentiation of lava flow from Fuji volcano, the chondrite-normalized REE pattern for the segregation vein lies above and nearly parallel to that for host basalt lava (Fig.8). No distinct difference in the value of the
87Sr/
86Sr ratio, with the difference of 0.0003 can be detected. Formation of the calc-alkali rock series by cotamination of basaltic magmas with crustal materials is not required by the isotopic evidence, but it may take place to the extent that the contaminating radiogenic Sr in the crustal material can be diluted beyond detection by magmatic Sr. The possible origin of these volcanic rocks is, therefore, the melting of the upper mantle, of the oceanic crustal rocks, or of both. If the lavas was formed by the melting of the upper mantle and (or) oceanic crustal rocks, their initial
87Sr/
86Sr ratios should be close to 0.7035, the most common value found in oceanic volcanic rocks.
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Yoji KOBAYASHI
Article type: Article
1979 Volume 24 Issue 3 Pages
153-168
Published: October 01, 1979
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The preferred orientations of dike swarms of four areas formed from Late Miocene to Pliocene are investigated in order to know the age of change of regional tectonic stress orientation in the inner belt of Southwest Japan. As the mechanism of dike formation is considered to be a natural magma-fracturing experiment and dikes are regarded as fossil tension cracks formed parallel to the direction of horizontal maximum compression stress (σ
Hmax) of regional tectonic origin, the preferred direction of σ
Hmx could be determined from the most concentrated trend of dikes of a swarm. The most concentrated trend of dikes at northern Tango Peninsula, Shimane Peninsula, Susa area and Myoken area are N-S, N-S, N10°W and N30°W, respectively. The directions of σ
Hmax obtained from the preferred orientation of dike swarms of the four areas coincide with the direction of the maximum compressional principal tectonic stress obtained from the strike and the sense of motion of faults and folds formed in the same age. This result gives the estimation that the average direction of σ
Hmax in the inner belt of Southwest Japan was N15°W±15° from Late Miocene to Pliocene.
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Shinobu HADA
Article type: Letter
1979 Volume 24 Issue 3 Pages
169-170
Published: October 01, 1979
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T. Ozawa, K. Kimizima, Y. Toma, J. Ossaka, J. Hirabayashi, T. Hayashi, ...
Article type: Abstract
1979 Volume 24 Issue 3 Pages
171-
Published: October 01, 1979
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T. Yamaguchi
Article type: Abstract
1979 Volume 24 Issue 3 Pages
171-172
Published: October 01, 1979
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H. Imai
Article type: Abstract
1979 Volume 24 Issue 3 Pages
172-
Published: October 01, 1979
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S. Aramaki, T. Fukushima, H. Haramura
Article type: Abstract
1979 Volume 24 Issue 3 Pages
172-
Published: October 01, 1979
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J. Ossaka, J. Hirabayashi, T. Ozawa, K. Kimijima, H. Ogura, T. Hayashi
Article type: Abstract
1979 Volume 24 Issue 3 Pages
172-173
Published: October 01, 1979
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J. Ossaka, J. Hirabayashi, T. Hayashi, T. Yoshida, S. Fukushima, S. Ts ...
Article type: Abstract
1979 Volume 24 Issue 3 Pages
173-174
Published: October 01, 1979
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K. Hiura
Article type: Abstract
1979 Volume 24 Issue 3 Pages
174-
Published: October 01, 1979
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H. Yamashita
Article type: Abstract
1979 Volume 24 Issue 3 Pages
174-
Published: October 01, 1979
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Hm. Okada, H. Watanabe, H. Yamashita, T. Maekawa, I. Yokoyama
Article type: Abstract
1979 Volume 24 Issue 3 Pages
174-175
Published: October 01, 1979
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T. Nagao
Article type: Abstract
1979 Volume 24 Issue 3 Pages
175-
Published: October 01, 1979
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O. Ujike
Article type: Abstract
1979 Volume 24 Issue 3 Pages
175-176
Published: October 01, 1979
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T. Tohara
Article type: Abstract
1979 Volume 24 Issue 3 Pages
176-
Published: October 01, 1979
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H. Satoh, T. Soya
Article type: Abstract
1979 Volume 24 Issue 3 Pages
176-177
Published: October 01, 1979
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T. Fukuoka
Article type: Abstract
1979 Volume 24 Issue 3 Pages
177-
Published: October 01, 1979
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M. Takeo, T. Maekawa, K. Wano, H. Okada
Article type: Abstract
1979 Volume 24 Issue 3 Pages
177-178
Published: October 01, 1979
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Y. Tanaka, Y. Sawada
Article type: Abstract
1979 Volume 24 Issue 3 Pages
178-
Published: October 01, 1979
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N. Sakata, H. Okada
Article type: Abstract
1979 Volume 24 Issue 3 Pages
178-
Published: October 01, 1979
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T. Moriya
Article type: Abstract
1979 Volume 24 Issue 3 Pages
178-179
Published: October 01, 1979
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M. Seino
Article type: Abstract
1979 Volume 24 Issue 3 Pages
179-
Published: October 01, 1979
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E. Miyajima, T. Maekawa, Y. Nishida
Article type: Abstract
1979 Volume 24 Issue 3 Pages
179-180
Published: October 01, 1979
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T. Harada
Article type: Abstract
1979 Volume 24 Issue 3 Pages
180-
Published: October 01, 1979
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H. Watanabe
Article type: Abstract
1979 Volume 24 Issue 3 Pages
180-181
Published: October 01, 1979
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H. Yamagishi, K. Matsui, I. Moriya
Article type: Abstract
1979 Volume 24 Issue 3 Pages
181-
Published: October 01, 1979
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T. Sugoshi, T. Maekawa
Article type: Abstract
1979 Volume 24 Issue 3 Pages
181-
Published: October 01, 1979
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S. Ehara
Article type: Abstract
1979 Volume 24 Issue 3 Pages
181-182
Published: October 01, 1979
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Y. Katsui, K. Sakai
Article type: Abstract
1979 Volume 24 Issue 3 Pages
182-
Published: October 01, 1979
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Y. Oba, Y. Ikeda
Article type: Abstract
1979 Volume 24 Issue 3 Pages
182-183
Published: October 01, 1979
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K. Okumura, T. Soya, K. Ono, H. Satoh
Article type: Abstract
1979 Volume 24 Issue 3 Pages
183-
Published: October 01, 1979
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Y. Katsui, Y. Oba
Article type: Abstract
1979 Volume 24 Issue 3 Pages
183-184
Published: October 01, 1979
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K. Niida
Article type: Abstract
1979 Volume 24 Issue 3 Pages
184-
Published: October 01, 1979
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T. Abiko
Article type: Abstract
1979 Volume 24 Issue 3 Pages
184-
Published: October 01, 1979
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S. Matsuo, T. Osumi, N. Sudzuki, T. Abiko
Article type: Abstract
1979 Volume 24 Issue 3 Pages
184-185
Published: October 01, 1979
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H. Ono, Y. Sudo
Article type: Abstract
1979 Volume 24 Issue 3 Pages
185-
Published: October 01, 1979
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H. Fujimaki, K. Aoki
Article type: Abstract
1979 Volume 24 Issue 3 Pages
185-186
Published: October 01, 1979
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M. Miyachi
Article type: Abstract
1979 Volume 24 Issue 3 Pages
186-
Published: October 01, 1979
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T KOBAYASHI
Article type: Abstract
1979 Volume 24 Issue 3 Pages
186-
Published: October 01, 1979
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K. Sato, J. Sato
Article type: Abstract
1979 Volume 24 Issue 3 Pages
186-
Published: October 01, 1979
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J. Hirabayashi, J Ossaka, T. Ozawa, K. Kimijima, I. Sanemasa, H. Sakam ...
Article type: Abstract
1979 Volume 24 Issue 3 Pages
186-187
Published: October 01, 1979
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K. Sakaguchi, T. Ui
Article type: Abstract
1979 Volume 24 Issue 3 Pages
187-
Published: October 01, 1979
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K. Suzuki, T. Ui
Article type: Abstract
1979 Volume 24 Issue 3 Pages
187-188
Published: October 01, 1979
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K. Ono, T. Soya, K. Okumura
Article type: Abstract
1979 Volume 24 Issue 3 Pages
188-
Published: October 01, 1979
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S. Uyeda, Chi. Nishiwaki
Article type: Abstract
1979 Volume 24 Issue 3 Pages
188-189
Published: October 01, 1979
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M. Sugihara, Y. Ida
Article type: Abstract
1979 Volume 24 Issue 3 Pages
189-
Published: October 01, 1979
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E. Ohtani
Article type: Abstract
1979 Volume 24 Issue 3 Pages
189-
Published: October 01, 1979
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E. Ohtani, M. Kumazawa
Article type: Abstract
1979 Volume 24 Issue 3 Pages
189-190
Published: October 01, 1979
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I. Kaneoka, J. Obradovich, H. Mehnert, M. Tatsumoto
Article type: Abstract
1979 Volume 24 Issue 3 Pages
190-
Published: October 01, 1979
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K. Mimura, N. S. MaLeod
Article type: Abstract
1979 Volume 24 Issue 3 Pages
190-191
Published: October 01, 1979
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