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Volume 20 (1986)
- Issue 6 Pages 261-
- Issue 5 Pages 213-
- Issue 4 Pages 159-
- Issue 3 Pages 111-
- Issue 2 Pages 61-
- Issue 1 Pages 1-
Volume 20, Issue 3
Displaying 1-6 of 6 articles from this issue
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Tetsuo Hashimoto, Akira Koyanagi, Kyoichi Yokosaka, Yasuo Hayashi, Tak ...1986 Volume 20 Issue 3 Pages 111-118
Published: June 20, 1986
Released on J-STAGE: April 08, 2008
JOURNAL FREE ACCESSSome quartzose beach sands, collected from the northern part of Niigata district, were examined by thermoluminescence color image (TLCI) analyses. Analyses were performed after purification of the quartz fraction by magnetic separation. Purified samples underwent chemical etching followed by gamma-ray irradiation. The proportion of red TL-emitting grains to blue ones seems to be related to the origin of the respective beach sands. Red TL grains are tentatively attributable to a volcanic dominated source, whereas the blue ones are mainly weathering products of plutonic rocks such as granite. TL-spectrophotometric analyses have been attempted to obtain more quantitative information on the TL-emission of the two different colors for these beach sands. The intensity ratios of red to blue TL were evaluated from analyses of respective glow-curves, corresponding to different wavelength regions. The ratios were concordant with the TLCI parterns. The applications of TLCI and TL-spectrophotometry to geological and archaeological samples are also suggested.View full abstractDownload PDF (1993K) -
I. Cornides, N. Takaoka, K. Nagao, S. Matsuo1986 Volume 20 Issue 3 Pages 119-125
Published: June 20, 1986
Released on J-STAGE: April 08, 2008
JOURNAL FREE ACCESSA noble gas study including measurements of relative abundances and isotopic ratios of noble gases was carried out for gas samples collected from gas wells in the Carpathian Basin, Hungary. 3He/4He ratios in gases in which CO2 predominates were 2.6 to 5.5 × 10-6, in contrast to 0.42 to 0.62 × 10-6 of those in gases in which CH4 prevails. The strainer depth of the former wells is in the range from 1, 400 to 1, 438 m, and that of the latter is 860 to 1, 183m. Contribution of the mantle He to the helium in the CO2 gases estimated to be 19 to 42% and that to the helium in the CH4 gases to be 2.5 to 4.0%. The δ13C (PDB) value of CO2 with the high 3He/4He ratio was in the range from -6.2 to -5.2‰, suggesting high contribution of the mantle CO2. A high contribution of mantle-derived gases to the tectonically quiescent area can be related to the thin crust and high heat flow in this region. CH4 predominant gases seem to be derived from an environment rich in K, Th and U. No isotopic anomalies were found for Kr and Xe.View full abstractDownload PDF (1808K) -
Tasuku Akagi, Tetsuya Kodama, Hiroki Haraguchi, Keiichiro Fuwa, Hiroyu ...1986 Volume 20 Issue 3 Pages 127-135
Published: June 20, 1986
Released on J-STAGE: April 08, 2008
JOURNAL FREE ACCESSThe distribution of trace metals (Al, Fe, Mn, Cd, Cu, Zn, and Y) dissolved in seawater around the Shikoku Island has been investigated, where salinity in the area ranged from 31 to 35‰. Sampling method, sample storage, and analytical procedure were carefully examined to avoid contamination. Two methods of atomic absorption spectrometry and inductively coupled plasma atomic emission spectrometry were employed for analyses of seawater samples and intercalibration of the analytical data. Almost all elements were found to show wide variations in concentration, i.e., higher concentration in the Inland Sea and lower concentration outside the Inland Sea. The latter concentrations were almost the same levels as those reported for surface water in the open ocean. The concentrations of Cu, Zn, Y, Cd, and Mn showed clearly negative correlations with salinity. This indicates that their distributions in the coastal area were regulated mainly by dilution with open seawater. The distributions of Al and Fe could be characterized by their lower concentrations in the surface water.View full abstractDownload PDF (2356K) -
Z. Z. Sheng, R. K. Guimon, P. K. Kuroda1986 Volume 20 Issue 3 Pages 137-141
Published: June 20, 1986
Released on J-STAGE: April 08, 2008
JOURNAL FREE ACCESSLarge enrichments of 231Pa as well as 210Po were observed in the high-temperature extracts from a pitchblende. These results indicate that an excess of 231Pa, like 210Po, may also be released into the earth's atmosphere during volcanic eruptions.View full abstractDownload PDF (997K) -
Nobuki Takamatsu, Masayuki Imahashi, Kyoko Kamimura, Makoto Tsutsumi1986 Volume 20 Issue 3 Pages 143-151
Published: June 20, 1986
Released on J-STAGE: April 08, 2008
JOURNAL FREE ACCESSLithium as well as major chemical constituents, and stable hydrogen and oxygen isotopic ratios in 30 saline spring waters (Cl>5, 000 mg/l) in Japan were determined to clarify the genesis of the waters. The relationship between log (Na/Li) and the temperature estimated by geothermometers revealed that the lithium content of saline spring waters are not usually controlled at the present-day temperatures of the hydrothermal systems. Taking into account the values of the deviation coefficient of lithium to seawater, CLi = (Li/Cl) sample/(Li/Cl) seawater, and the regions from which the spring waters were collected, the spring waters can be classified into the following four groups: Group 1, representing saline waters from coastal line (CLi = 1.2–22), Group 2 those from greentuff region (CLi = 17–110), Group 3 those from Osaka Basin (CLi = 160–220), and Group 4 those from the outer part of Median Tectonic Line (CLi = 250–440). The genetic features of the respective groups are discussed in detail.View full abstractDownload PDF (2345K) -
Itsuro Kita, Sachihiro Taguchi1986 Volume 20 Issue 3 Pages 153-157
Published: June 20, 1986
Released on J-STAGE: April 08, 2008
JOURNAL FREE ACCESSOxygen isotopic ratios were measured for the silica which was precipitated from the solution in process of evaporative concentration of Otake geothermal water at 76 and 88°C. The oxygen isotopic ratios of the silica precipitates were extremely out of isotopic equilibrium with the solution in which the colloidal silica was observable. The fractionation factors for the “silica-solution in evaporative concentration system” were compared with those obtained for “the silica-flowing geothermal water system” where the silica is in oxygen isotopic equilibrium with the water. The difference is explained by isotopic zoning of the growing amorphous silica particles. The rearrangement and interlinkage of adsorbed silica on the surface of the amorphous silica contributes to attaining oxygen isotopic equilibrium between the silica precipitate and water. Amorphous silica phase once formed does not re-equilibrate with the solution at later stages. Hence the apparent oxygen isotopic fractionation between the bulk silica precipitate and the solution at the final stage seems to be out of equilibrium.View full abstractDownload PDF (1077K)
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