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Volume 47 (1962)
- Issue 6 Pages 205-
- Issue 5 Pages 167-
- Issue 4 Pages 123-
- Issue 3 Pages 81-
- Issue 2 Pages 41-
- Issue 1 Pages 1-
Volume 47, Issue 3
Displaying 1-5 of 5 articles from this issue
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Hideo Ishikawa, Rokuro Kuroda, Hiroshi Hamaguchi1962 Volume 47 Issue 3 Pages 81-85
Published: March 05, 1962
Released on J-STAGE: August 07, 2008
JOURNAL FREE ACCESSWide developement of massive biotite-granite, intruded into the late Mesozoic to early Tertiary Kumage formation, has been found in Yakushima, Kagoshima Prefecture. The granite including large porphyritic orthoclase has been scarcely found elsewhere in Japan.
The distribution of minor elements in the porphyritic orthoclase and biotite as well as in the granite is critically commented from the geochemical and crystallochemical standpoints of view. Spectrochemical analyses for titanium, vanadium, chromium, cobalt, nickel, copper, gallium and lead are given for 18 samples of orthoclase, 6 samples of biotite and 5 samples of granite.
Appreciable concentration of lead in porphyritic orthoclase as comgared with the orthoclase and biotite formed during the normal stage of magmatic crystallization suggests that the formation of the granite is completed in rather pegmatite-forming conditions. The growth of large porphyritic crystal of orthoclase postulates the physical condition of magma rich in soda and of low viscosity. That condition of magma should necessarily be accompanied with appreciable enrichment of copper. The porphyritic orthoclase indicates appreciable concentration of copper and is thought to be grown under the condition just mentioned.View full abstractDownload PDF (278K) -
Kazuo Harada1962 Volume 47 Issue 3 Pages 86-90
Published: March 05, 1962
Released on J-STAGE: August 07, 2008
JOURNAL FREE ACCESSThe writer found radial aggregate of stilbite (1cm_??_3cm in diameter) in the cavity of granite-porphry from Onigajo, Mie Prefecture. The writer examined some mineralogical properties and mode of occurrence.
The cavity was always surrounded with stilbite and phenocryst of plagioclase (An10_??_An15, showing normal zoning) and groundmass replaced partially by it, so that this stilbite must be the last product of the magma of granite porphry.
X-ray diffraction pattern and reffractive index (by immerson method) are shown in Table 1 and Table 2 and chemical analysis is shown in Table 3. The chemical formula was given as (Ca1.91 K0.84 Na3.50 Mg0.60) (Al9.49 Si30.52) O80 30.04 H2O. The mineral contains larger amounts of Na2O than normal stilbite.View full abstractDownload PDF (226K) -
Noboru Ôba, Masao Abe, Kôichi Miwa1962 Volume 47 Issue 3 Pages 91-96
Published: March 05, 1962
Released on J-STAGE: August 07, 2008
JOURNAL FREE ACCESSSo-called Shirasu (volcanic ash and sand) which is considered to have been derived from Aira Volcano has a pecuriality different from common fine-grained sediments. The authors examined physicodynamic features and mineral arrangement in the Shirasu in order to know its pecuriality.
From such viewpoint, after, the Primary Shirasu was cemented in the natural state and their thin sections were made.
As the result of examination of physical and dynamical properties such as water permeability, entraped air volume, penetrating and shearing resistances of the Primary Shirasu, the obvious differences were recognized between in vertical and horizontal direction
On the other hand, thin sections under the microscope, show that the manner of mineral arrangement is quite different from one another in each direction.
Consequently, it was possibly assumed that physico-dynamic properties of the Primary Shirasu has a close relation with the manner of pores and mineral arrangement.View full abstractDownload PDF (757K) -
KAZUO MIYAGI1962 Volume 47 Issue 3 Pages 97-110
Published: March 05, 1962
Released on J-STAGE: August 07, 2008
JOURNAL FREE ACCESS -
1962 Volume 47 Issue 3 Pages 115-121
Published: 1962
Released on J-STAGE: July 13, 2012
JOURNAL FREE ACCESSDownload PDF (526K)
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