All issues
Successor
Volume 15 (1965)
- Issue 74 Pages 287-
- Issue 73 Pages 227-
- Issue 72 Pages 109-
- Issue 70-71 Pages 63-
- Issue 69 Pages 1-
Volume 15, Issue 72
Displaying 1-12 of 12 articles from this issue
- |<
- <
- 1
- >
- >|
-
Goro ASANO, Nobuya TANAKA, Hiromi TANAKA, Norio HISANAGA1965 Volume 15 Issue 72 Pages 109-119
Published: July 10, 1965
Released on J-STAGE: June 12, 2009
JOURNAL FREE ACCESSIn this paper are summarised the results of the chemical and physical studies of thermally metamor-phosed coals from the Takashima colliery. For the physical studies, X-ray diffraction. records by the proportional counter diffractometer have been used. The X-ray study had two objects. One was to determine ash minerals in the thermally metamorphosed coal, and the other was to standardize the X-ray diffraction patterns obtained from normal thermally unaffected coals as well as from semi-cokes and cokes. These have been described and discussed in detail. Optical methods have been also applied to this study under the reflecting microscope, and the texture and unisotropic opticall character of the thermally affected coals have been investigated, which revealed that the unisotropic mosaic structure becomes distinct from the stage of semi-coke. The refractive index of the coal of lover grade of carbonization becomes higher as the grade rises.View full abstractDownload PDF (2359K) -
Terumi MIYAKE, Nobuya TANAKA, Hiromi TANAKA, Norio HISANAGA1965 Volume 15 Issue 72 Pages 120-129
Published: July 10, 1965
Released on J-STAGE: June 12, 2009
JOURNAL FREE ACCESSOres of the Shimokawa mine are divided into two types, banded and massive sulfide ores; the former predominate in Northern orebody, while the latter in Central and Hangingwall orebody, though in some cases both types coexist in the same orebody with a sharp or gradual boundary. Banded ore consists of sulfide bands, several millimeters wide, in parallel alternation with bands of quartz-chloritic tu ffaceous material. Massive sulfide ore is compact, fine-textured and usually homogeneous, but where it is highly enriched with chalcopyrite fine banding of pyrrhotite is observed.
The ore is composed mainly of pyrite, chalcopyrite and pyrrhotite. Sphalerite also occurs in lesser amount which increases locally. Minor amounts of cubanite, valeriite cobalt pentlandite and magnetite are observed under the microscope.
Outstanding feature of the ore is the texture or crystallized gel as shown by colloform texture. Neither katagenic association of minerals from early to later mineralization stages, nor replacement texture of early association by later is observed in thorough underground and microscopic studies.
From these ore textures as well as from other geological facts, the genesis of the ore is concluded as sedimentary-exhalative.View full abstractDownload PDF (14471K) -
[in Japanese]1965 Volume 15 Issue 72 Pages 130-132
Published: July 10, 1965
Released on J-STAGE: June 12, 2009
JOURNAL FREE ACCESSDownload PDF (268K) -
[in Japanese]1965 Volume 15 Issue 72 Pages 132-133
Published: July 10, 1965
Released on J-STAGE: June 12, 2009
JOURNAL FREE ACCESSDownload PDF (177K) -
[in Japanese]1965 Volume 15 Issue 72 Pages 133-136
Published: July 10, 1965
Released on J-STAGE: June 12, 2009
JOURNAL FREE ACCESSDownload PDF (376K) -
[in Japanese]1965 Volume 15 Issue 72 Pages 137-139
Published: July 10, 1965
Released on J-STAGE: June 12, 2009
JOURNAL FREE ACCESSDownload PDF (214K) -
[in Japanese]1965 Volume 15 Issue 72 Pages 140-142
Published: July 10, 1965
Released on J-STAGE: June 12, 2009
JOURNAL FREE ACCESSDownload PDF (2804K) -
[in Japanese], [in Japanese], [in Japanese], [in Japanese]1965 Volume 15 Issue 72 Pages 143-148
Published: July 10, 1965
Released on J-STAGE: June 12, 2009
JOURNAL FREE ACCESSDownload PDF (3409K) -
1965 Volume 15 Issue 72 Pages 148-155
Published: July 10, 1965
Released on J-STAGE: June 12, 2009
JOURNAL FREE ACCESSDownload PDF (647K) -
1965 Volume 15 Issue 72 Pages 155
Published: July 10, 1965
Released on J-STAGE: June 12, 2009
JOURNAL FREE ACCESSDownload PDF (86K) -
1965 Volume 15 Issue 72 Pages e1
Published: 1965
Released on J-STAGE: June 12, 2009
JOURNAL FREE ACCESSDownload PDF (17K) -
1965 Volume 15 Issue 72 Pages Plate1-Plate2
Published: July 10, 1965
Released on J-STAGE: June 12, 2009
JOURNAL FREE ACCESSDownload PDF (2450K)
- |<
- <
- 1
- >
- >|