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Volume 7 (1968)
- Issue 3-4 Pages 41-
- Issue 1-2 Pages 1-
Volume 7, Issue 1-2
Displaying 1-5 of 5 articles from this issue
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[in Japanese]1968 Volume 7 Issue 1-2 Pages 1-9
Published: January 30, 1968
Released on J-STAGE: September 20, 2011
JOURNAL FREE ACCESSDownload PDF (1195K) -
Yasuo KITAGAWA1968 Volume 7 Issue 1-2 Pages 10-16
Published: January 30, 1968
Released on J-STAGE: September 20, 2011
JOURNAL FREE ACCESSSeveral kinds of podzolic soils develop under the forest of Japanese cypress on quartz porphyry belt lying above 1, 400 meters high in Kiso mountain region, Nagano prefecture. Clay mineral composition of the fraction less than 2 micron of two soils, was examined by chemical analyses, differential thermal analysis and X-ray diffraction method.
The outline of results are as follows:
(1) In both soils, dioctahedral 2:1-type minerals are dominant. Interlayer aluminium is detected only B horizons presumably showing that interlayer aluminium is removed from A2 horizons. The principal species of clay mineral in A2 horizon, is random mixedlayer mineral of vermiculite-montmorillonite-mica clay mineral. All samples contain a few amount of mica minerals free from the mixed-layer mineral.
(2) Kaolin minerals are found in both soils in considerable amount especialy in the soil of dry water regime, while gibbsite and vermiculite free from the mixed-layer's and has no interlayer aluminium are found only in soil of wet water regime.
(3) Appreciable amounts of quartz is detected, of which the rule of distribution is not clear.View full abstractDownload PDF (736K) -
Daizo KITA1968 Volume 7 Issue 1-2 Pages 17-24
Published: January 30, 1968
Released on J-STAGE: September 20, 2011
JOURNAL FREE ACCESSSoil is one of the most staple natural construction material in public works. So iti s necessary that its geochemical properties i. e. mineralogical and chemical as well as its physical and/or mechanical properties should be clarified prior to the construction.
This paper deals with the soil of the excavation area used for the east coastal reclamation in Singapore from the geochemical viewpoint. And it is disclosed that the soil, despite its being an older alluvial sandy soil of granite origin, has highly peculiar geochemical properties as compared with the granite sandy soil of Japan. Namely, this sandy soil has not only a high content of quartz sand-approximately 60%, the hardest of common rock-forming minerals, but these sand particles are also very compacted together. However, in this sandy soil containing about 12% clay, approximately 40-50% of the total clay content is montmorillonite, which is one of the expanding lattice clay minerals of three-layer types This causes the sandy soil to soften very easily in water. Besides, under the climate in Singapore where the temperature and the humidity are high, the soil goes into the process of laterization. However, its degree is not so strong yet.
This geochemical study could offer useful suggestions to understand the physicaland mecha nical properties of the soil and to decide the methods of excavation to be employed in the area.View full abstractDownload PDF (14720K) -
Hideo MINATO, Minoru UTADA1968 Volume 7 Issue 1-2 Pages 25-32
Published: January 30, 1968
Released on J-STAGE: September 20, 2011
JOURNAL FREE ACCESSRecentry, zeolite rock was found from the Neogene, Formation at Koriyama, Kago; shima prefecture. This formation had several similar characters as “Green Tuff” widely distributed in Tohoku district. This zeolite rock was almost composed of clinoptilolite and mordenite and associated with quartz, plagioclase, hypersthene, hornblende and biotite. This clinoptilolite was passibly Ca type one from its character of thermal behavior.View full abstractDownload PDF (3043K) -
[in Japanese]1968 Volume 7 Issue 1-2 Pages 33
Published: January 30, 1968
Released on J-STAGE: September 20, 2011
JOURNAL FREE ACCESSDownload PDF (161K)
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