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Volume 36 (1952)
- Issue 6 Pages 169-
- Issue 5 Pages 135-
- Issue 4 Pages 103-
- Issue 3 Pages 65-
- Issue 2 Pages 33-
- Issue 1 Pages 1-
Volume 36, Issue 3
Displaying 1-4 of 4 articles from this issue
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Keiichi Omori, Shûzô Hasegawa, Jun Otomo1952 Volume 36 Issue 3 Pages 65-72
Published: July 20, 1952
Released on J-STAGE: March 18, 2008
JOURNAL FREE ACCESSA new occurence of hausmannite and tephroite from a manganese deposit at Himegamori, Iwate Prefecture, is described. The minerals occurred in granular aggregetes in hornstone of Paleozoic formations. A chemical composition of hausmannite is given as (Mn2•94 Fe0•02 Mg0•02)2•98O4•00 Optical constants of tephroite are α=1.782, β=1.802, γ=1.812, γ-α=0.030 and, 2V=(-) 65°. And its chemical composition is given as (Mn1•81 Fe0•02 Ca0•04 Mg0•12) 1•99 Si1•00 O4•00 These minerals were believed to be formed from Azuki ore in hornstone by contact metamorphism of granitic intrusion.View full abstractDownload PDF (1085K) -
Ryoya Sugimoto1952 Volume 36 Issue 3 Pages 72-84
Published: July 20, 1952
Released on J-STAGE: March 18, 2008
JOURNAL FREE ACCESS(1) The Teine deposits, once famous for various rarer minerals, occur mainly in the Tertiary formation, called “Green Tuff Group”, which consists of volcanic materials in the forms of lavas and pyroclastics alternating with some mudstone.
(2) Most of the veins are believed to have filled up a part of radial fissures around the centre of eruption of propylite, while some veins have a tangential arrangement near the margin of the propylite.
(3) The gangue minerals of the Koganesawa deposits are quartz and carbonates, while those of the Mitsuyama deposits are quartz and barite. The former have the lower temperature minerals, such realgar, orpiment, etc. than the later.
(4) Luzonite crystallized earlier than enargite, and those minerals are the product of the latest stage of mineralization. The luzonite heated in a electric furnace is no obserbal change to 400°C.
(5) The content of Au and Ag has a close connection with quartz, barite and calcite in the upper parts and with tetrahedrite (freibergite), luzonite, enargite in the lower part, where silver minerals are not detected.View full abstractDownload PDF (906K) -
Yoshio Okazaki1952 Volume 36 Issue 3 Pages 85-93
Published: July 20, 1952
Released on J-STAGE: March 18, 2008
JOURNAL FREE ACCESSTwo coal seams which are believed to correspond with the Harutori coal bearing formation in the Miocene, are respetively situated at the Harutori mine, Kushiro city, Hokkairio and the Hifashikuchiro mine about 9km. north of the former.
Samples were taken at 20cm. interval. The separation of the pollens from these coal somples were made by mixing a small quant ?? ty of them crushed to-pass a 30-mesh sieve, with an equal amount of KCIO3, and then adding about 10 times the bulk of pure HNO3 to this mixture. Then after one or two days, these browned samples were washed in water and finally treated with 10 ?? 150% KOH.
For the analyses more than 220 grains of tree pollen are counted and the percentages of respectve-tree registered at each eve1.
The observed pollens are Sequoia or Metascquoia, Taxodium, Glyptostrobus, Pinus, Picea or Keteleeria, Larix, Mysas Carva, Alnus, Corylus, Carpinus, Betula, Tilia, Jugiaris. Quercus, Salix, Ericacea, Gramineous etc. These results (Table 1 and Fig. 1 and 2) show that Sequoia (including Metasequoia, Taxodivm and Glyptostrobus, for it is difficult to distingush their genus) is exceedingly aboundant throughout, and Pinus, Alnus, Ericacea, Carpinus etc are also relatively aboundant, indicating these percentages are constant. The results show also that though few differences of the percentage are seen between the coals of the mines, and so to Sequoia pollen that of the Higashikushiro mine is average 6.7% as much as that of the Harutori mine, Pinus complements this, and those of the coal seam in the two mines are respectively similar. Thus it is considered that conifers such as Sequoia or Metasequoir, Taxodium, Glyptostrobus, Pinus etc depeloped throughnout at that time, and that pollenanalytical results are geologically correlated as a same horizon.View full abstractDownload PDF (544K) -
Kameki Kinoshita, Kunihiko Muta1952 Volume 36 Issue 3 Pages 93-102
Published: July 20, 1952
Released on J-STAGE: March 18, 2008
JOURNAL FREE ACCESSThe marcasite-native sulphur deposit of the Kusu mine is shallow seated epithermal replacement type and the ore forming agent may have been an acending hydrothermal sulphuric solution of volcanic origin.
The mother rock alteration of the Kusu mine are described in detail.
They are characterzed by the Tonal arrangement of wall rock alteration such as silica rock, kaolinite clay, ore body, kaolinite clay and original rock from the surface to down ward.View full abstractDownload PDF (1170K)
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