巻号一覧
15 巻 (1981)
- 2 号 p. 33-
- 1 号 p. 1-
15 巻, 2 号
選択された号の論文の5件中1～5を表示しています
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報文
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飯盛 喜代春, 飯盛 和代1981 年 15 巻 2 号 p. 33-44
発行日: 1981/12/30
公開日: 2016/11/19
ジャーナル フリーSince 1966, the authors have determined the chemical compositions of ground waters in the Hirayama landslide area, which has been known to be a very large scale landslide area, which has been known to be a very large scale landslide area. The landslide at coal-mine zone occurs in the area where the coal-bearing Tertiary formation is widely covered by basaltic flow. The chemical compositions of ground waters reflect the geological feature of the area. High quantities of HCO3-, SO42-, Ca2+ and Mg2+ are supplied to the ground waters in this landslide area through the processes of water-rock interaction. Those concentrations are higher in landslide area than in non-landslide area. The concentrations of chemical constituents of ground waters in the landslide area seem to have increased slightly since 1966. The positive relationships are observed between the concentrations of Ca2+, Mg2+, HCO3- and SO42- in the ground waters. The chemical composition of ground water in landslide area clearly indicates the condition for the chemical weathering of rocks in the area. There seems to exist a certain relationship between the concentrations of major chemical constituents in ground water and the occurrence of landslide.抄録全体を表示PDF形式でダウンロード (1153K) -
八耳 俊文, 辻 康, 中井 信之1981 年 15 巻 2 号 p. 45-52
発行日: 1981/12/30
公開日: 2016/11/19
ジャーナル フリーDirect measurements of hydrogen sulfide released from tidal flats were made on six diverse seashores of Mikawa Bay, Japan, from November 1979 to October 1980. The concentration has been determined in situ by sulfide-ion electrode method, with a detectability to be approximately 0.1 μ mol/1 (0.1μ mol H2S/m2/hr). The hydrogen sulfide emission rates are detected to be only about 1 to 2 μ mol H2S/ m2/hr at organic-rich, black and muddy tidal flats, except one site, and less than 0.1 μ mol H2S/m2/hr at organic-poor, white and sandy tidal flats. We estimate the amount of hydrogen sulfide yearly released from tidal flats in Japan to be about 90 tons S based on the emission rates measured in this study. This value is far smaller than the values, some million tons of sulfur, evaluated indirectly by previous investigations. The atmospheric sulfur over Japan is supplied chiefly by man-made sulfur dioxide, and hydrogen sulfide released from tidal flats is negligible.抄録全体を表示PDF形式でダウンロード (691K) -
山田 正俊, 角皆 静男1981 年 15 巻 2 号 p. 53-59
発行日: 1981/12/30
公開日: 2016/11/19
ジャーナル フリーTwo deep-sea sediments taken from the wastern North Pacific Ocean were analyzed for 232Th, 230Th and 226Ra. The observed vertical distributions of 226Ra fit pretty well with those having diffusion coefficients of 1-3x10-9 cm2/sec. The flux of 226Ra out of the sediment are calculated to be 0.022 dpm/cm2/yr to 0.037 dpm/cm2/yr from the deficiency of 226Ra relative to 230Th in the sediments. This indicates that 226Ra in sea water is mainly supplied from bottom sediments. The concentration of 226Ra in the layer extremely enriched in Mn was also in large excess relative to its parent 230Th. This fact may be due to its post depositional migration and adsorption on Mn oxide. The deposition rate of 226Ra in the Mn rich layer is estimated to be 0.0065 dpm/cm2/yr and 0.010 dpm/cm2/yr from the excess of 226Ra. The rates of migration of heavy metals (e.g. Ni and Co) in the sediments are also discussed by applying the above results on 226Ra.抄録全体を表示PDF形式でダウンロード (680K) -
山本 修一, 石渡 良志1981 年 15 巻 2 号 p. 60-69
発行日: 1981/12/30
公開日: 2016/11/19
ジャーナル フリーInsoluble organic materials (kerogens) isolated from lake (L. Haruna) and river (R. Tamagawa) sediments were characterized by a chemical oxidation (KMnO4) method and their compositions of amino acids, carbohydrates and fatty acids were determined. The formation process of kerogen was discussed on the basis of the results. (1) Amino acids, carbohydrates and fatty acids comprise 6.8 to 10.7% (wt%) of kerogens, which correspond to 1.8-3.0% of the total organic matter (TOM) in sediments. (2) The enrichment factors (a concentration of a component in the kerogen divided by a concentration of the component relative to TOM in the sediment) of amino acids, carbohydrates and fatty acids are: carbohydrates (0.04-0.08)<amino acids (0.37-0.58)<fatty acids (1.23-2.50). This result shows that a significant amount of fatty acids is enriched in the kerogens. (3) A possible mechanism for the formation of kerogens in recent sediments is as follows: at the first stage, kerogen-nucleus is formed through a Maillard Reaction from carbohydrates and amino acids during deposition and in sediment. In parallel with this reaction, hydrophobic compounds as fatty acids incorporate into the kerogen-nucleus.抄録全体を表示PDF形式でダウンロード (956K) -
角皆 静男1981 年 15 巻 2 号 p. 70-76
発行日: 1981/12/30
公開日: 2016/11/19
ジャーナル フリーThe radiocarbon age of deep ocean water, the lapse time after its leaving from the surface, was estimated by resolving two difficulties in the calculation. One is the effect of particulate carbon being added to the deep water, of which correction method is presented. The other is the effect of mixing of water. Considering the process of the deep water formation, we can regard that the age of deep water is an arithmetical mean of those water masses forming the water. The results show various facts. The correction for the particulate carbon fluxes is not important. In the Atlantic the ages of the Antarctic intermediate water and of the Antarctic bottom water decrease with their northward flow. This means the deep currents are interchanging water molecules by mixing. In the North Pacific there is no major source of deep water and a long time, at least 500 years, is necessary for the transport of the bottom water to the surface. The oldest water of about 2100 years old exists in the mid-latitudes of the North Pacific off United States. There is a striking chronocline in the deep water of the South Pacific over the Tonga-Kermadic Trench.抄録全体を表示PDF形式でダウンロード (652K)
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