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Volume 36, Issue 195
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[in Japanese]1986 Volume 36 Issue 195 Pages 1-9
Published: February 28, 1986
Released on J-STAGE: June 12, 2009
JOURNAL FREE ACCESSDownload PDF (505K) -
Nora K. FOLEY1986 Volume 36 Issue 195 Pages 11-20
Published: February 28, 1986
Released on J-STAGE: June 12, 2009
JOURNAL FREE ACCESSFluid-inclusion thermometry of sphalerite and quartz from the Fukazawa mine indicates that the minerals formed in the temperature range of 250°C to 350°C from a fluid with a salinity that varied from 2.1 to 5.2 weight percent NaCl equivalent. Homogenization temperature and salinity are positively correlated for sphalerite and some quartz. The slope of a regression line through data points from one sample is equivalent to the slope of a line of constant density suggesting that density may have been a factor in controlling the temperature-salinity gradient. Local thermal and chemical gradients may have helped in the formation of zones of chalcopyritization. Chalcopyrite-bearing fluid inclusions in sphalerite have hotter homogenization temperatures (350°C) than any other inclusions measured and may contain fluids responsible for chalcopyritization.View full abstractDownload PDF (1940K) -
Katsumi MARUMO, Osao SAWAI1986 Volume 36 Issue 195 Pages 21-26
Published: February 28, 1986
Released on J-STAGE: December 14, 2009
JOURNAL FREE ACCESSK-Ar measurements on mica-bearing clay samples collected from Toyoha, Chitose, Horobetsu, Kagenosawa, Toya Takarada and Minamishiraoi deposits were made in an attempt to establish the metallogenic epochs of the southwestern Hokkaido, Japan.
Clays collected from alteration halos of the Toyoha Pb-Zn-Ag vein-type deposits and the Chitose Au-Ag vein-type deposits give K-Ar ages of 2.2±0.6 Ma and 3.6±0.3 Ma, respectively. These values indicate that the ages of the vein-type mineralizations of the Toyoha and Chitose deposits were later than those of the kuroko mineralizations in Hokuroku area, northeast Honshu, Japan.
Samples from the Horobetsu and Kagenosawa Au-Ag-Cu-Pb-Zn disseminated and vein-type deposits together with the Toya Takarada and Minamishiraoi kuroko-type deposits give K-Ar age values generally in the range of 12.3-14.2 Ma indicating that the ages of the mineralizations of these deposits were similar to those of the kuroko deposits in Hokuroku area.
A clay sample which contains mica-montmorillonite mixed layer minerals from the foot wall clay zone of the Minamishiraoi deposit presents a little younger K-Ar age (11.6±0.6 Ma) than the mica-bearing clay of the clay zone whose K-Ar age is 12.5±0.6 Ma. This difference in age values can be explained by the existance of exchangeable potassium ions in mixed layer minerals.View full abstractDownload PDF (396K) -
Masaaki SHIMIZU1986 Volume 36 Issue 195 Pages 27-36
Published: February 28, 1986
Released on J-STAGE: December 14, 2009
JOURNAL FREE ACCESSPhase relations involving sphalerite in the (Cu-)Fe-Zn-S system which were determined experimentally over a wide range of pressure and temperature and their applications, especially the sphalerite geobarometry, have been reviewed. Some problems on the applications have been also pointed out.View full abstractDownload PDF (667K) -
Takayasu UCHIO1986 Volume 36 Issue 195 Pages 37-39
Published: February 28, 1986
Released on J-STAGE: June 12, 2009
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1986 Volume 36 Issue 195 Pages 40
Published: February 28, 1986
Released on J-STAGE: June 12, 2009
JOURNAL FREE ACCESSDownload PDF (46K) -
1986 Volume 36 Issue 195 Pages 41-65
Published: February 28, 1986
Released on J-STAGE: June 12, 2009
JOURNAL FREE ACCESSDownload PDF (2193K) -
1986 Volume 36 Issue 195 Pages 66-67
Published: February 28, 1986
Released on J-STAGE: June 12, 2009
JOURNAL FREE ACCESSDownload PDF (176K)
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