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Volume 40 (1956)
- Issue 6 Pages 207-
- Issue 5 Pages 169-
- Issue 4 Pages 131-
- Issue 3 Pages 83-
- Issue 2 Pages 39-
- Issue 1 Pages 1-
Volume 40, Issue 6
Displaying 1-7 of 7 articles from this issue
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Mitsuo Shimazu1956 Volume 40 Issue 6 Pages 207-216
Published: December 01, 1956
Released on J-STAGE: March 18, 2008
JOURNAL FREE ACCESSThe Sanbagawa, Mikabu metamorphics and the Chichibu Paleozoics are diatributed in this district.
Green rocks occuring in the crystalline schist, are composed of massive green rock and the green intrusive rock (the Mikabu intrusive), which include meta-diabase, meta-gabbro and amphibolite.
Most of the ultramafic rocks concordantly intrude along the boundary between the massive green rock and the schist. They are mainly composed of dunite, banded diallage peridotite, diallage peridotite, fine-grained and coarse-grained gabbro, and are companied by gabbro pegmatite and albitite. Most of the ultramafic rocks are affected more or less by serpentinization and other metasomatic actions. Although these alterations are varied in different rocks, they are always characterized by the transformation of olivine to antigorite and of plagioclase to grossularite. Some gabbroic rocks are also altered into rodingite. Compared with the ordinary grossularite, the grossularite in these rocks has lower refraction indices (1.720-1.733) and smaller density (3.50) and lattice constant (11.88 A).
From the properties, it is considered that the grossularite probably inculdes the hydrogrossular molecules.View full abstractDownload PDF (1307K) -
Ichikazu Hayase, Tokudô Tsutsumi1956 Volume 40 Issue 6 Pages 216-223
Published: December 01, 1956
Released on J-STAGE: March 18, 2008
JOURNAL FREE ACCESSRadioactive minute mineals of the Gyoja-yama granite were studied with nuclear emulsion. Zircon, monazite, xenotiire and thorite were found as the origin of alpha radiations. The former two minerals were very abundant in this granite mass, especially in the contact zone. Generally, the minor minerals are more radioactive than the larger ones.
The zonal radioactive heterogeneity is obvious from the alpha track distribution and from the optical property of one minute zircon crystal. This fact, we consider, may suggest the tendency of the radioactive material depositing in granite.View full abstractDownload PDF (485K) -
Asahiko Sugaki, Chuichi Tashiro1956 Volume 40 Issue 6 Pages 223-230
Published: December 01, 1956
Released on J-STAGE: March 18, 2008
JOURNAL FREE ACCESSUnder the microscope, some unmixing intergrowths are found in chalcopyrite and sphalerite from the Daira mine, Akita Prefecture, which is working on the zinc and lead veins filling up the fissures in the Tertiary tuff and mudstone. They show the textures as follows;
1) Lamellar and drop-like crystals of pyrrhotite in chalcopyrite.
2) Skeletal crystals of sphalerite in chalcopyrite.
3) Emulsoidal crystals of chalcopyrite in sphalerite.
4) Lamellar and fine drop-like cubanite in emulsoidal chalcopyrite in sphalerite.
5) Emulsoidal chalcopyrite in skeletal crystals of sphalerite in chalco-pyrite.
From the assemblages of minerals and the results of the thermal experiments, these intergrowths are belived to have been formed by unmixing of solid solutions produced at high temperatures. Therefore, a part of the ore veins of the Daira mine may be said to have been formed at high temperatures.View full abstractDownload PDF (1761K) -
Fumio Kuramochi1956 Volume 40 Issue 6 Pages 230-238
Published: December 01, 1956
Released on J-STAGE: March 18, 2008
JOURNAL FREE ACCESSThe writer measured the modulus of elasticity on dry condition from 5 cm. cube test-pieces of the Tertiary quartz-diorite which occurs at Mito-yama, Okutama Town, Tokyo. At beforehand with the measurement, he also measured the apparent specific gravity, the absorption of water, and the porosity. These experimental results are shown in Table 2.View full abstractDownload PDF (2149K) -
Shiro Kanematsu1956 Volume 40 Issue 6 Pages 238-244
Published: December 01, 1956
Released on J-STAGE: March 18, 2008
JOURNAL FREE ACCESSAs the results of the Kobiwako bed observation in the western part of the Lake Biwa, the writer recognized the following formation and clay minerals.
1. The weathering products of the biotite granite are widely distributed and in some places these beds are alternated with the soilificated products of clayslate, sandstone and quartzite.
2. By means of chemical analysis and X-ray studies on the colloidal fraction clay minerals are classified in two groups:
a) Werthering products of biotite granite contain dominantly kaolinite with lesser amounts of montmorillonite.
b) Clayslate and sandstone soils are dominant ?? y hydrated halloysite with minor amount or none of the other clay minerals.
From the results of the clay mineral studies in the Kobiwako bed in Shiga Prefecture, conc ?? uded as follows:
a) Hydrated halloysite and illite are contained in soils of all rocks.
b) The weathering products of rocks included a kaolinite.
c) The more weathering products are converted into s ?? il the more hydrated halloysite increased.View full abstractDownload PDF (367K) -
Hiroshi Asai1956 Volume 40 Issue 6 Pages 245-249
Published: December 01, 1956
Released on J-STAGE: March 18, 2008
JOURNAL FREE ACCESSThe writer describes the petrographical characters of the ultrabasic rock founed as a block on the River Panke, Hidaka province and gives some considerations on its genesis.View full abstractDownload PDF (329K) -
Studies of perlite in Japan (2)Hiroshi Kuwabara1956 Volume 40 Issue 6 Pages 249-250
Published: December 01, 1956
Released on J-STAGE: March 18, 2008
JOURNAL FREE ACCESSDownload PDF (163K)
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