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Volume 12 (1962)
- Issue 56 Pages 317-
- Issue 55 Pages 257-
- Issue 54 Pages 193-
- Issue 53 Pages 129-
- Issue 52 Pages 63-
- Issue 51 Pages 1-
Volume 12, Issue 54
Displaying 1-12 of 12 articles from this issue
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in the Hitachi Mine, Ibaraki Prefecture, Japan[in Japanese]1962 Volume 12 Issue 54 Pages 193-198
Published: August 30, 1962
Released on J-STAGE: June 12, 2009
JOURNAL FREE ACCESSAs the results of the geological surveys for several years, we recognized in 1954 that the ore deposits of the Hitachi mine are controlled by the folded structure (the Sasame folded structure). Since then, we started the exploration from this point of view for the unexplored area between the Hitachi main ore zone and the Irishiken ore zone. In 1956, the Fujimi ore bodies were discovered in that area, and are now under exploration by developing 7 ore bodies. It is noticeable that they lie in the limited rock facies.View full abstractDownload PDF (529K) -
Osao KADOTA1962 Volume 12 Issue 54 Pages 199-210
Published: August 30, 1962
Released on J-STAGE: December 14, 2009
JOURNAL FREE ACCESSIn recent years, some uranium deposits of sedimentary type have been found in the Neogene Tertiary sediments of the Uetsu massif region, Northeast Japan. Most of them occur in the basal part of the Tsugawa formation of middle Miocene age.
The Tsugawa formation is rich in muddy facies in the eastern part of the distribution area, whereas it is so in sandy and/or conglomeratic facies in the western part along the coast of the Japan Sea. In the Oguni-Kanamaru district, this formation involves conglomeratic or sandy facies in the lower and middle parts, and muddy facies in the upper.
A tabular uranium deposit is found in arkose of the Tsugawa formation of the Oguni-Kanamaru district. Genetically this may belong to the "water table type", judging from the modes of occurrence, the texture of ores, and other geologic features.View full abstractDownload PDF (2668K) -
Keinosuke NAGASAWA1962 Volume 12 Issue 54 Pages 211-222
Published: August 30, 1962
Released on J-STAGE: December 14, 2009
JOURNAL FREE ACCESSThe genesis of the copper-lead-zinc veins in the Mikawa mine, Niigata Prefecture is discussed mainly -from a physicochemical viewpoint.
The mineralization can be divided into two stages: The earlier stage is characterized by chalcopyrite, sphalerite, galena, pyrite, quartz and chlorite, and the later stage by hematite, dolomite-ankerite, siderite, kaolinite and chlorite.
The earlier ore shows a marked zonal distribution, that is, a galena-sphalerite-quartz assemblage occurs in the upper levels than a chalcopyrite-pyrite-quartz-chlorite assemblage. The distribution of these as semblages is closely related to the internal vein structure, and it has been concluded that narrower channelways for the flow of the ore solution were more favourable to the deposition of the latter assemblage than that of the former. Such a distribution of the mineral assemblages may be explained in terms of the evapor ation of the volatile components in the ore solution. Wall-rock alteration during the earlier stage of mineralization-silicification, sericitization, and kaolinization from the inner side, is ascribed to the outward diffusion of a weakly alkaline ore solution.
The later ore is accompanied by intense alteration characterized by kaolinitic clay and siderite. This ore and the accompanying alteration are ascribed to the acid and oxidizing characteristics of the solution.View full abstractDownload PDF (997K) -
Seinosuke SHIMADA, Toyotaro TSUNORI1962 Volume 12 Issue 54 Pages 223-224
Published: August 30, 1962
Released on J-STAGE: June 12, 2009
JOURNAL FREE ACCESSOn the 23rd level of the Besshi Mine, massive sulfide ore on the hanging-wall side is locally bounded by brecciated quartz schist which is impregnated with arsenopyrite, pyrite and chalcopyrite. The massive sulfide ore is rimmed by a thin layer of dark brown banded ore. Stannite is found in this layer.View full abstractDownload PDF (2372K) -
1962 Volume 12 Issue 54 Pages 225-229
Published: August 30, 1962
Released on J-STAGE: June 12, 2009
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[in Japanese]1962 Volume 12 Issue 54 Pages 229-235
Published: August 30, 1962
Released on J-STAGE: June 12, 2009
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[in Japanese]1962 Volume 12 Issue 54 Pages 236-242
Published: August 30, 1962
Released on J-STAGE: June 12, 2009
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1962 Volume 12 Issue 54 Pages 242-246
Published: August 30, 1962
Released on J-STAGE: June 12, 2009
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1962 Volume 12 Issue 54 Pages 246-249
Published: August 30, 1962
Released on J-STAGE: June 12, 2009
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1962 Volume 12 Issue 54 Pages e1a
Published: 1962
Released on J-STAGE: June 12, 2009
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1962 Volume 12 Issue 54 Pages e1b
Published: 1962
Released on J-STAGE: June 12, 2009
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1962 Volume 12 Issue 54 Pages Plate1-Plate2
Published: August 30, 1962
Released on J-STAGE: June 12, 2009
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