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Volume 10 (1976)
- Issue 4 Pages 165-
- Issue 3 Pages 107-
- Issue 2 Pages 51-
- Issue 1 Pages 1-
Volume 10, Issue 4
Displaying 1-9 of 9 articles from this issue
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Edward D. Goldberg, Vern Hodge, Minoru Koide, John J. Griffin1976 Volume 10 Issue 4 Pages 165-174
Published: December 20, 1976
Released on J-STAGE: April 08, 2008
JOURNAL FREE ACCESSA record of metal pollution in the Tokyo atmosphere is developed for the past 30 years in sediments from the Palace Moat. Zinc, copper, chromium, silver, lead, cadmium, cobalt and nickel are identified as pollutants on the basis of higher contents in recently deposited strata. On the other hand, aluminum, vanadium and iron were essentially uniform in concentration throughout the sedimentary record. Manganese showed an increasing concentration with depth in the deposit. Apparently it diffuses to the overlying waters following reduction of higher valence state species to the more soluble divalent state. Elemental carbon, most probably arising from the combustion of wood, varied between 0.30 and 0.78% by weight. Opalline tests contributed between 21 and 31% of the weight of the dried sediment. The ages of the strata were determined by Pb-210, Pu-239+240 and Cs-137 geochronologies. The amounts of the pollutants do not bear a direct relationship to their atmospheric levels inasmuch as there is an enhancement in the sediment concentrations through the entry of soil debris containing anthropogenic metals. This magnification of direct fallout appears to be between four and five-fold.View full abstractDownload PDF (2920K) -
Yasushi Kitano, Nobuko Kanamori, Sayoko Yoshioka1976 Volume 10 Issue 4 Pages 175-179
Published: December 20, 1976
Released on J-STAGE: April 08, 2008
JOURNAL FREE ACCESSAdsorption of zinc and copper ions on calcite and aragonite has been measured by suspending powdered calcite or aragonite in various solutions containing zinc and copper ions. The amounts of copper adsorbed on calcite and aragonite in pure water are smaller than those in seawater, whereas those of zinc in pure water are larger than those in seawater. The extent of the adsorption on calcite and aragonite depends on the procedures for the formation of the calcite and aragonite. The influence of zinc and copper ions in solution on the transformation of aragonite to calcite, has been further studied. Results obtained are as follows: The presence of zinc ions in solution inhibits very strongly the transformation of aragonite to calcite. About 90 per cent of zinc ions in the solution is adsorbed by aragonite. The presence of copper ions, however, does not inhibit it, even though copper ions in solution are removed completely through its adsorption on aragonite.View full abstractDownload PDF (1498K) -
István Cornides, János Kiss1976 Volume 10 Issue 4 Pages 181-184
Published: December 20, 1976
Released on J-STAGE: April 08, 2008
JOURNAL FREE ACCESSThe variation of the carbon isotope ratio of calcite samples collected from the micro crystalline main body of a hydrothermal ore vein has been found to follow a trend opposite to that shown by the oxygen isotope ratio of the same samples. This anomalous behaviour is explained by the presumable mechanism of the formation of the vein. The “oxygen-carbon isotopic behaviour” has been found normal in the case of big single crystals of calcite from the same vein.View full abstractDownload PDF (1107K) -
H. Meier, W. Hecker1976 Volume 10 Issue 4 Pages 185-195
Published: December 20, 1976
Released on J-STAGE: April 08, 2008
JOURNAL FREE ACCESSIn systematic microscopic measurements completed by fission track studies the occurrence of polonium halos and polonium bands could be confirmed in biotites of different areas. The abundance of the different types of polonium halos is given by the order 210Po > 218Po > 214Po. As magmatic and often also hydrothermal mechanisms are contrary to geological evidences a supergene hypothesis has been supposed for the genesis of the polonium halos. According to this mechanism polonium isotopes are accumulated out of uranium or radium-bearing solutions which are liberated from rocks by leaching processes of percolating weathering waters. The concept of the given origin of polonium halos may be significant in discussing problems of dating, uranium prospection and the origin of secondary uranium deposits.View full abstractDownload PDF (4333K) -
Kazuo Sato, Akira Sasaki1976 Volume 10 Issue 4 Pages 197-203
Published: 1976
Released on J-STAGE: April 08, 2008
JOURNAL FREE ACCESSLead isotope ratios measured for selected pyrite samples from pre-Cenozoic bedded cupriferous iron sulfide (Besshi-type) deposits in Japan show a considerable variation, contrasting with the previous results on the Cenozoic stratiform (Kuroko-type) deposits. The data obtained for two major tectonic units in Southwest Japan indicate that the Paleozoic ores from the Outer Zone are distinctly more enriched in 206Pb than the ores from the Inner Zone. In the Outer Zone, the lead isotope ratios appear to be essentially uniform within the area of Shikoku Island where occur principal Paleozoic deposits. Leads less enriched in 206Pb are found in another area of the Outer Zone, suggesting a variability in isotopic composition along the whole extension of the Outer Zone. The Outer Zone Paleozoic leads tend to be more radiogenic than the Cenozoic Kuroko leads. A genetic link of lead between these two types of stratiform ores may thus be ruled out. A certain evolutionary relationship, presumably in an island-arc environment, is possible between the Kuroko and the Inner Zone Paleozoic leads. Available geochemical data for volcanic rocks associated with the Outer Zone deposits suggest that the ore leads of this zone may have been derived from a rift-zone igneous activity. Compared with “conformable” ore leads, the stratiform ore leads from Japanese Paleozoic terrains are more variable in isotopic composition. Of the Outer Zone leads, the Shikoku Island group is distinctly more enriched in 206Pb than the “conformable” ore leads of similar ages. It is suggested that there may be more than one class of evolutionary system in the stratiform ore leads.View full abstractDownload PDF (2167K) -
Naoki Onuma, Norimasa Nishida, Satoru Okudera, Yoshiaki Ono1976 Volume 10 Issue 4 Pages 205-209
Published: December 20, 1976
Released on J-STAGE: April 08, 2008
JOURNAL FREE ACCESSInternal chemical inhomogeneity in a single euhedral olivine from the Murchison C2 chondrite has been visualized by a two dimensional element concentration map technique, as applications of automated electron probe microanalyzer. The olivine crystal has a double layered structure which consists of rather homogeneous inner region (from 0 to 200μm in dia., Fa27) and outer region with a zonal structure (from 200 to 300μm in dia., Fa27∼Fa33). Al, Cr-rich, Fe, Mg silicate inclusions exist in the outer region of the olivine. These features might have been established in a cooling solar nebula, reflecting the presence of two different environmental conditions during crystal growth of the single olivine.View full abstractDownload PDF (1570K) -
S. J. Yeh, P. Y. Chen, C. N. Ke, S. Tanaka1976 Volume 10 Issue 4 Pages 211-214
Published: December 20, 1976
Released on J-STAGE: April 08, 2008
JOURNAL FREE ACCESSHeavy metals in drinking water in Taiwan have been determined by a neutron activation analysis technique. The concentrations of heavy metals in different water samples vary widely, and their possible bearing on an endemic disease is discussed.View full abstractDownload PDF (891K) -
M. W. Rowe1976 Volume 10 Issue 4 Pages 215-218
Published: December 20, 1976
Released on J-STAGE: April 08, 2008
JOURNAL FREE ACCESSDownload PDF (918K) -
M. W. Rowe, J. M. Herndon1976 Volume 10 Issue 4 Pages 219-221
Published: December 20, 1976
Released on J-STAGE: April 08, 2008
JOURNAL FREE ACCESSDownload PDF (466K)
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