巻号一覧
42 巻, 2 号
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浅井 宏1958 年 42 巻 2 号 p. 53-64
発行日: 1958/04/01
公開日: 2008/08/07
ジャーナル フリーThe writer presents some considerations on the genesis of some basic schistose rocks in the southern Hidaka metamorphic province.
The basic schistose rocks described here are the schistose-plagioclase amphibolite (fine grained rock), the plagioclase amphibolite (medium grained rock) and the hornblende-plagioclase gneiss (coarse grained rock).
It is concluded that most of the fine or medium grained basic schistose rocks are originated from the biotite rich hornfelsic rocks and the coarse grained basic schistose rocks are from the coarse biotite rich quartz-biotite-plagioclase rocks. The former two are products at the earlier stage of metamorphism and the latter is a product at the later stage of metamorphism in this district.抄録全体を表示PDF形式でダウンロード (751K) -
八島 隆一1958 年 42 巻 2 号 p. 64-70
発行日: 1958/04/01
公開日: 2008/08/07
ジャーナル フリーIn the eastern part of Fukushima basin, the Ryozen formation which comprises non-porphyritic andesite, olivine basalt, pyroxene andesite and rhyolite, is unconformably underlied by the pre-Tertiary granodiorite and allied rocks. The Daikoyama neck forms a cone amid the hilly area, about 13km north-east to Fukushima city. It is an erosional
remnant, composed of non-porphyritic andesite, and has an elliptical ground plane. The marginal facies of the neck is characterised by the presence of a large amount of xenocrysts derived from granitic rocks, and the groundmass composed of labradorite, hypersthene, magnetite, glass and tridymite. The central part is non-porphyritic, and its groundmass is composed of labradorite, hypersthene, magnetite, glass and quartz. Chemical composition of the central part of the neck shows followig characteristics: MgO/FeO+Fe2O3 ratio is small, and SiO2 content is low, though normative quartz is comparatively high, and content of modal quartz is very high. A dyke “D” named in the neck is composed of glassy rock with a large amount of xenocrysts derived from granites, and is probably contemporaneous with the neck. While dykes, “B” and “C” are porphyritic two pyroxene andesite, and are younger than the neck.抄録全体を表示PDF形式でダウンロード (965K) -
宇留野 勝敏1958 年 42 巻 2 号 p. 70-82
発行日: 1958/04/01
公開日: 2008/08/07
ジャーナル フリーAbout 300 plagioclases (0_??_70%An) in the Cretaceous Tabashiné adamellite stock of the Kitakami mountainland are observed on the universal stage. Projection of the twin plane (010) on the optical plane reveals a wide variation between the high-and low-temperature form for the composition range of 20 to 60% An (Figs. 6 and 7). To treat such variation, a modified chart (Fig. 4) and a composition-temperature form diagram (Fig. 7) are proposed. The coexistence of various forms even in a single crystal can not be explained by the incorporation of xenocrysts of the different forms, nor by the thermal history after the growth of crystals. It is more likely that it is caused by the unstable crystallizing conditions, i. e. changes in the pressure and in the rate of crystallization as the result of convection current in the magma.抄録全体を表示PDF形式でダウンロード (1173K) -
八郎潟底層の有機物組成の層序の分布島田 昱郎1958 年 42 巻 2 号 p. 82-89
発行日: 1958年
公開日: 2008/08/07
ジャーナル フリーThe lagoon sediments of Hachiro-gata, near Akita City, consist of a copropelic facies accumulation of peat, peaty silt, and dark grey or green colored clay, in which carbonaceous matter, plant fragments, and shell remains etc. are widely distributed. Extractable organic matter, hydrocarbon content, and some other organic compounds of the 45 specimens collected from these sediments were determined. Hydrocarbon fractions were separated from extractable organic matter by liquid chromatography on alumina. It is ascertained that the contents of hydrocarbons increases and the amounts of extractable organic matter decreases with increasing depth of burial below the floor of the lagoon. In this paper, their stratigraphical distribution and some alteration of organic matters in sediments are described.抄録全体を表示PDF形式でダウンロード (426K) -
北原 順一1958 年 42 巻 2 号 p. 90-100
発行日: 1958/04/01
公開日: 2008/08/07
ジャーナル フリーPDF形式でダウンロード (1781K)
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