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Volume 5 (1971)
- Issue 4 Pages 151-
- Issue 3 Pages 113-
- Issue 2 Pages 57-
- Issue 1 Pages 1-
Volume 5, Issue 4
Displaying 1-4 of 4 articles from this issue
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Atsushi Ando, Hajime Kurasawa, Teiko Ohmori, Eizo Takeda1971 Volume 5 Issue 4 Pages 151-164
Published: 1971
Released on J-STAGE: April 08, 2008
JOURNAL FREE ACCESSData of rock analyses, determinations of major and minor constituents, 47 minor elements, strontium isotopic ratios, oxygen isotopic compositions and geological ages reported by analysts for JG-1 granodiorite and JB-1 basalt issued from the Geological Survey of Japan are compiled.View full abstractDownload PDF (5494K) -
Shizuo Tsunogai, Yoshiyuki Nozaki1971 Volume 5 Issue 4 Pages 165-173
Published: 1971
Released on J-STAGE: April 08, 2008
JOURNAL FREE ACCESS210Pb and 210Po in sea water of the Pacific were determined and applied to make clear the behavior of lead in the surface water of the ocean. The concentration of 210Pb in the surface water was much smaller than the expected value, if it were soluble in sea water. Its geographical distribution showed a latitudinal variation which presented the higher values in both mid-latitudes of the Pacific and the lower values in the tropical Pacific and the southern South Pacific. These facts suggest that lead is settling with the velocity of (1-5) × 10-4 cm/sec in the surface layer. However, it is very unlikely that the lead exists as pure solid phase of lead oxide. The lead probably forms an eutectic solid phase with other host metals such as manganese oxide. The ratios of 210Po to 210Pb in surface water were larger than those in meteoric precipitation, but most of them were smaller than unity.View full abstractDownload PDF (3696K) -
Shizuo Tsunogai1971 Volume 5 Issue 4 Pages 175-185
Published: 1971
Released on J-STAGE: April 08, 2008
JOURNAL FREE ACCESSThe oxidation rate of sulfite was determined in its dilute solution. The reaction is substantially of the first order and the rate is much accelerated by the presence of small amounts of heavy metals such as iron, copper and manganese. The half-life time of sulfite in the natural rain water is more than a few hours. The observed concentration of sulfite in rain water is nil or much smaller than that of sulfate. Thus, the anthropogenic sulfur is removed from the atmosphere after the oxidation to sulfate in air or in cloud droplets. The residence time of aerosol sulfur of anthropogenic origin and the mean-life time of sulfur dioxide for the oxidation are estimated to be 10 days and 30 hrs, respectively, from the concentrations of sulfate and 210Pb in precipitation. It is inferred from the experiments and the observations that excess sulfate in meteoric precipitation is essentially of anthropogenic origin.View full abstractDownload PDF (5136K) -
Hideo Ishikawa, Sol Berman, Kenzo Yagi1971 Volume 5 Issue 4 Pages 187-206
Published: 1971
Released on J-STAGE: April 08, 2008
JOURNAL FREE ACCESSGeochemical data for 13 samples of alkalic rocks from Nemuro Peninsula, Hokkaido, are presented and discussed. Analyses for trace elements, Ni, Co, Cr, Sc, Cu, Zn, Ga, Zr, Y, Pb, Ba, Sr and Li in a differentiated sheet ranging from picritic dolerite to syenite and in an undifferentiated dolerite sheet showing pillow structure, are given. It is shown that the Nemuro alkalic rocks have distinctly higher concentrations of Ba, Zn, Cu, Pb, Y and Li, high ratios of K/Sr and Ca/Sr, and lower concentrations of Sr, Ni, Co, Cr, Sc and Zr than do alkali basaltic rocks from other districts in the world. The behavior of the major and trace elements suggests that the Nemuro alkalic rocks were modified chemically by deuteric alteration during the magmatic stage. The parental potash-rich olivine basalt magma of these alkalic rocks was formed probably by partial melting of phlogopite-peridotite in the upper mantle.View full abstractDownload PDF (8665K)
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