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Volume 42 (1958)
- Issue 6 Pages 261-
- Issue 5 Pages 207-
- Issue 4 Pages 161-
- Issue 3 Pages 101-
- Issue 2 Pages 53-
- Issue 1 Pages 1-
Volume 42, Issue 5
Displaying 1-7 of 7 articles from this issue
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Ryohei Ota1958 Volume 42 Issue 5 Pages 207-215
Published: October 01, 1958
Released on J-STAGE: August 07, 2008
JOURNAL FREE ACCESSIn this thesis, the studies on druse in basalt and trachybasalt distributed in San-in and North Kyushu districts are explained about ten localities, concerning varieties, optical properties, genetical sequence and paragenesis of druse minerals, in addition to genetical relation to mother rock and the description of the mother rock itself. Every genetical sequence of druse minerals in the above localities is shown in Figs. 1_??_8 and is summarized in Figs. 9 and 10. The mode of occurrence is not always the same, but the mother rock is either remarkably influenced by contamination or often considered to be originally rich in volatile substances.View full abstractDownload PDF (565K) -
Hiroshi Asai1958 Volume 42 Issue 5 Pages 215-227
Published: October 01, 1958
Released on J-STAGE: August 07, 2008
JOURNAL FREE ACCESSThe writer discusses the origin of the so-called metamorphosed calcareous concretions in felsic metamorphic rocks in Hidaka province. The metamorphosed calcareous concretions form originally at the crest of the microfolding, at the inner part of the semicircular mylonitic arc, or at the mylonitic part, of biotite hornfels in a small scale. In the metamorphosed calcareous concretions, basic plagioclase, hornblende, diopside, vesuvianite, calcite, ilmenite and ore generally occur accopanying the concentration and the dispersion of biotite of biotite hornfels.
He concludes that the origin is attributed to neither of addition of materials from the surrounding coarse metamorphic rocks or from basic rocks, nor to the original one in sedimentary rocks, but to the metamorphic differentiation which take place in biotite hornfels at the time of the mechanical movement of its own.View full abstractDownload PDF (803K) -
Yôtarô Seki1958 Volume 42 Issue 5 Pages 227-238
Published: October 01, 1958
Released on J-STAGE: August 07, 2008
JOURNAL FREE ACCESSGlaucophane problem, that is the origin of glaucophane schists has come recently to be one of the most important and attractive problems in petrology in the world. Here, (1) the mineralogical, petrographical and chemical properties of the glaucophane schists and (2) the historical outline of the investigation of glaucophane schists during the past one hundred years will be briefly described.
It is pointed out that the hypothesis of “glaucophane schist facies” proposed by P. Eskola in 1929_??_ and 1939 has been recently proved through the geological and petrological studies on glaucophanitic regional metamorphic terrains in Corsica, Celebes and Japan and the experimental and thermodynamic studies performed by American petrologists during the past ten years.View full abstractDownload PDF (685K) -
Ryoya Sugimoto1958 Volume 42 Issue 5 Pages 238-246
Published: October 01, 1958
Released on J-STAGE: August 07, 2008
JOURNAL FREE ACCESSThe Otarunai district is situated at about 12km west of Sapporo city. On the relationships of ore bodies to quartz-porphyry and the paragenesis of ore minerals may come to the considerations as follows;
(1) The intrusive quartz-porphyry is closely connected with the geological structure, elongation of this body being parallel to the structual lines running N-S.
(2) The depostis and mineralized zones occur in the quartz-porphyry or its surrounding pyroclastic and normal sediments. Most significant are structual controls by the pre-ore quartz-porphyry. Among them, relative competency of rocks seems to be a chief factor on ore localization.
(3) The Otoyo mine is characterized by occurence of bismuthinite and cupper sulphosalts. This mineralogical association is similar to the lower part of the Toriyabe vein at the Teine mine, about 4km east of this deposits.
(4) On the other hand, the Tairyosawa, Inatoyo, Toyohiro and Takinosawa deposits have almost same characters. The predominant sulphides are pyrite, sphalerite, galena and chalcopyrite. Especially, chalcopyrite within sphalerite occurs as emulsion blebs. Among these blebs, some parts are exsolution products, others being replacement. These characters are similar to of the Harima vein at the Toyoha mine, about 5km west of this deposits.View full abstractDownload PDF (1031K) -
Hatao Matsumoto, Syozo Tanaka, Masaaki Kamata1958 Volume 42 Issue 5 Pages 246-248
Published: October 01, 1958
Released on J-STAGE: August 07, 2008
JOURNAL FREE ACCESSAt a sudden explosion of Aso Volcano in 1958, about 50.000 tons of old ejecta which had been packed in vent, are erupted. Many kinds of sublimate minerals such as epsomite, ferroan pickeringite, melanterite, kirovite, pyrite, marcasite, chalcopyrite, sulphur, tridymite, chloromagnesite and molysonite are found on the surface or cavities of the ejecta. With the lapse of time after explosion, relative amount of volcanic gases HCl, H2S are decreased, on the contrary SO2, CO2, R and Rn are increased.View full abstractDownload PDF (130K) -
Yasuo Ukai, Takaya Kawakami, Yasuhiro Kimura1958 Volume 42 Issue 5 Pages 249-256
Published: October 01, 1958
Released on J-STAGE: August 07, 2008
JOURNAL FREE ACCESSThe fluorimetric analysis is the most sensitive method of determining the extremely minute amount of uranium. The authors construct a sensitive fluorimeter by using a photomultiplier tube (MS-6S) as the fluorescence detector which multiplies the initial photocurrent several thousand times by means of secondary emission dynode stages. The dynode of this multiplier is fed with 100_??_150 volts per stage. The sensibility of this fluorimeter can be varied over a wide range by changing the voltage per dynode stage or the load register of grid in bridge circuit, and by interposing the secondary filters in the optical pass. At the most favourable sensibility, one scale division corresponds to 0.00014mg of uranium, i. e. 0.05γ.
It is well known that there are many quenching elements which reduce the fluorescence intensity, and the quenching degree depends only on the concentration of quencher and not on the ratio of concentration of quencher to that of uranium. The authors investigated the quenching effects of Zr, Ce, Th to uranium and concluded that these effects must be accounted for in the microfluorimetric analysis of uranium in zircon.View full abstractDownload PDF (369K) -
Keiichi Omori, Shuzo Hasegawa, Hiroshi Konno1958 Volume 42 Issue 5 Pages 256-260
Published: October 01, 1958
Released on J-STAGE: August 07, 2008
JOURNAL FREE ACCESSDownload PDF (187K)
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