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Volume 44 (1960)
- Issue 6 Pages 263-
- Issue 5 Pages 221-
- Issue 4 Pages 179-
- Issue 3 Pages 121-
- Issue 2 Pages 73-
- Issue 1 Pages 1-
Volume 44, Issue 6
Displaying 1-7 of 7 articles from this issue
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Jun-ichi Masui1960 Volume 44 Issue 6 Pages 263-271
Published: November 01, 1960
Released on J-STAGE: August 07, 2008
JOURNAL FREE ACCESSThe volcanic ash soils with different colours, textures and hardnesses were collected from the soil profile according to different depths in northeast Japan. The mineralogical properties of the soils were studied.
1. The soils usually have a clay pan at about 30 cm in depth from the surface, strong adhesion, and are very poor in plant growth.
2. The soils have low saturation degree, and these pH values are low.
3. The mineralogical compositions of the sand fraction is composed of quartz, oligoclase-andesine hypersthene, opaque minerals, pumice, volcanic glass and a very small amount of augite and hornblende. In the lower layer which is the weathered product of the dacitic tuff referred to upper Pliocene age, hornblende did not be found.
4. The clay fraction is mainly composed of montmorillonite with a small amount of halloysite, gibbsite, quartz, cristobalite. From the surface layer to the middle montmorillonite slightly decreases, and gibbsite and halloysite increase. In the lower layer which has a large amount of gibbsite and cristobalite, any clay minerals except a very few amount of halloysite did not be found.View full abstractDownload PDF (451K) -
Yukio Takano, Shoichiro Hayashi, Kozo Nagashima1960 Volume 44 Issue 6 Pages 272-275
Published: November 01, 1960
Released on J-STAGE: August 07, 2008
JOURNAL FREE ACCESSCrystals of cosalite Pb2Bi2S5 were found from the pegmatitic quartz vein in the manganese ore deposit at the Hagidaira mine. The result of chemical analysis revealed, Pb 41 %, Bi 43 %, S 16 %, with 6.9 specific gravity. The crystal is acicular, attaining to 2cm in length, and is elastic. When measured by the two circle goniometer, the crystal showed (1•10•0).(231)•(4•19•14)•(9•11•6) faces, in addition to b•a•n•r•d•f•k faces, and the morphological axial ratio a:b:c=0.7981:1:0.1695 was obtained. By the use of X-ray diffractometer and Weissenberg camera, the crystal was confirmed to belong to the D16 2h - Pbnm space group. The cell dimensions were a0=19.09 Á, b0=23.89 Á, and c0=4.058 Á. The axial ratio obtained through X-ray experiments became a0 : b0 : c0=0.7978 : 1:0.1697, which coincide well with the morphological axial ratio.View full abstractDownload PDF (603K) -
Takashi Yamamoto1960 Volume 44 Issue 6 Pages 276-279
Published: November 01, 1960
Released on J-STAGE: August 07, 2008
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Katsutoshi Uruno1960 Volume 44 Issue 6 Pages 280-286
Published: November 01, 1960
Released on J-STAGE: August 07, 2008
JOURNAL FREE ACCESSThe anorthite constituting the allivalitic orbicular rock which was described in the volume 44, No. 5 of this journal, is of peculiar features : 1) chemical composition (An 95±1) is so homogeneous as to show no zoning at all, 2) most of them are the large wedges of single crystal having C-twin in the part belonging to core (a) (Fig. 1, 2), and showing very fine feather like A-twin but no C-twin at the outer zones, 3) it arranges radially orienting b-axis rather parallel to the radial pole, 4) dusty fine drops of “groundmass inclusion” which are common in the phenocrystic plagioclase of the host rock, are found only in the core (a). It is concluded from the relation in the density of various parts of orbicular rock, and the absence of zoning in anorthite, that the ball has probably been formed in the lower part of the magma chamber, slightly oversaturated in anorthite, by floating up of anorthite phenocrysts. And it is assumed that the alternate zones with different contents of iddingsite after olivine, are the reflection of several times of eruption rhythmically releasing static pressure to the lower part of chamber.View full abstractDownload PDF (801K) -
Yoshimasu Kuroda, Yoshio Ogura1960 Volume 44 Issue 6 Pages 287-291
Published: November 01, 1960
Released on J-STAGE: August 07, 2008
JOURNAL FREE ACCESSAlthough their metamorphic character and geological significance have not been investigated, have been known several met-amorphic rocks, such as Wareyama, Yamagami, and Matsugadaira, along the sheared zone of northeastern Abukuma Plateau. In a part of the Yamagami metamorphic rocks, we have found albite-spotted schists, being very similar to the spotted schist from Sambagawa metamorphic zone, which is of glaucophane schist metamorphism. We, also, found pumpellyite in some rock from the Yamagami metamorphic rocks. Some considerations on the relation between these rocks and the metamorphic character are also described.View full abstractDownload PDF (868K) -
Hazime Takamura1960 Volume 44 Issue 6 Pages 292-299
Published: November 01, 1960
Released on J-STAGE: August 07, 2008
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Hitoshi Onuki1960 Volume 44 Issue 6 Pages 300-306
Published: November 01, 1960
Released on J-STAGE: August 07, 2008
JOURNAL FREE ACCESSThe chloritoid-bearing rocks derived from tuffaceous material have been found in Kawai, Shimohei-gun, Iwate Prefecture. These chloritoid-bearing rocks contain sericite and chlorite as index minerals of the quartz-albite-sericite-chlorite sub-facies in the green schist facies. As compared with so-called “Kitakami median zone” where cloritoid-bearing rocks are found in various zones of the contact metamorphic aureole of the Tono granodiorite intrusion, in this area, these rocks are found only in a lower grade zone. The chemical composition of these chloritoid-bearing and their related rocks are studied. The chemical composition, optical properties and X-ray powder diffraction data of the separated chloritoid by the isodynamic magnetic separator have been investigated. The chemical formura and optical properties of this chloritoid are
(Fe++0.74 Fe+++0, 18 Mg0.05 Ca0.02 Mn0.00)0.99 Al1.91 Si1.08 (OH)1.78 O5.22 and α=1.721 β=1.725 γ=1.729 2Vγ=60°. These resulting data, nearly equal the nature of the theoretical chloritoid. Some geological and petrological consideration of these chloritoid-bearing rocks are discussed.View full abstractDownload PDF (367K)
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