巻号一覧
32 巻 (1992 - 1993)
- 4 号 p. 217-
- 3 号 p. 153-
- 2 号 p. 69-
- 1 号 p. 3-
32 巻, 2 号
選択された号の論文の10件中1～10を表示しています
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山本 聰1992 年 32 巻 2 号 p. 69-77
発行日: 1992/11/25
公開日: 2011/09/20
ジャーナル フリーFormation processes of pelagic clays were reviewed in this report, particularly in relation to geochemical characteristics of pelagic deep-sea cherts. Geochemically, both pelagic clays and pelagic deep-sea cherts are characterized by constant Fe/Mg ratios. Two types of pelagic clays/cherts may be recognized according to the Fe/Mg values:(1) the Fe/Mg value for the pelagic clays formed on the mid-oceanic ridge areas, and (2) the Fe/Mg value for the pelagic clays formed off the mid-oceanic ridges and in the abyssal floor. The Fe/Mg values in the pelagic deep-sea cherts are important to reconstruct the paleogeographic condition of ancient ocean floors. Pelagic clays in the modern ocean floor are assumed to be consolidated as pelagic red cherts.抄録全体を表示PDF形式でダウンロード (5504K) -
芝崎 靖雄, 前田 雅喜, 西岡 明祐, 刀根 如人1992 年 32 巻 2 号 p. 78-85
発行日: 1992/11/25
公開日: 2011/09/20
ジャーナル フリーIt has been suggested that plasticity of clay has been connected with the water in the vicinity of the surface of clay particles. Previously, we have revealed that the plasticty of clay was strongly related to the thickness of the water (bound water) on the surface of clay particle obtained from the measurement by the Pfefferkorn method. In the present work, we have investigated the relation between the plasticity and the thickness of the unfrozen water obtained from measurement of DSC (Differential Scanning Calorimetry) for many kind of natural clays, and compared both the thickness of bound water and the unfrozen water. Following results were obtained: 1) a linear relationship was observed for the thickness of unfrozen water and bound water. 2) the thickness of bound water was about 1/3 of that of unfrozen water. 3) the thickness of unfrozen water was applicable to the index for the plasticity of clay as well as that of bound water. 4) DSC peak suggested micro pores (for example which were in halloysite).抄録全体を表示PDF形式でダウンロード (891K) -
田崎 和江, 荒谷 美智, 矢野倉 実, 海保 邦夫, 野田 修司1992 年 32 巻 2 号 p. 86-96
発行日: 1992/11/25
公開日: 2011/09/20
ジャーナル フリーSpherical heating-shocked mica clays are found in Cretaceous-Tertiary (K-T) boundary sediments in the eastern district of Hokkaido, northernmost Japan. The K-T boundary sediments contain relatively high Ir concentrations suggesting an asteroid struck the Earth and caused mass extinctions at the end of the Cretaceous. Foraminifera are totally absent in the grayish black clay. Mineralogical investigations of the claystone have been carried out by the use of X-ray powder diffraction, high resolution electron microscope, energy dispersive spectrometer and heavy-iron Rutherford scattering. Singularity of clay minerals of a continuous stratigraphic section spanning the K-T boundary reveals that the spherical interstratified clay in < 2μm fraction are largely decomposed. The spherical clay shows characteristic stacking disorder of 14Å, 10Å, 7Å phase, which is suggested to be heating eventsin the K-T boundary.抄録全体を表示PDF形式でダウンロード (10454K) -
交換性陽イオンと吸水特性石田 良二, 西川 総明1992 年 32 巻 2 号 p. 97-107
発行日: 1992/11/25
公開日: 2011/09/20
ジャーナル フリーSedimentary rocks of the Neogene, so called “soft rocks” are widely distributed in Japan. These soft rocks, especially smectite bearing tuffs and mudstones, sometimes cause the serious troubles such as ground pressure, landslide and crumbling of cut slope. To clarify the relationship between chemical properties and deterioration of the soft rocks during water absorbing process, typical soft rock samples collected from hydrothermally or diagenetically altered Neogene system have been studied by X-ray diffraction method, polarizing microscope, CEC and exchangeable cation analysis, slaking test and water absorbing test. All of samples are abound of many kinds of clay minerals and zeolites such as smectite, mica, chlorite, kaokinite, clinoptilolite and mordenite. These rocks can be devided into three groups on the basis of exchangeable cation compositions, Na-type, Ca-type and mixed type. On the other hand, the results of slaking test indicate that the deformation of the rock specimens can be devided into three types, swelling type, crumbling type and intermediate type. These types correspond to exchangeable cation types, namely, swelling type to Na-type, crumbling type to Ca-type and intermediate type to mixed type respectively. The water absorbing curves are grouped into two types of “successively increasing type” and “saturated type”. Na type corresponds to the former and Ca type to the latter. The results indicate that the deteioration process of soft rocks is affected by the content of smectite, and exchangeable cation composition of caly minerals.抄録全体を表示PDF形式でダウンロード (5572K) -
酸性雨の岩石鉱物に与える影響の研究 (その1)坂本 尚史, 小林 祥一1992 年 32 巻 2 号 p. 108-120
発行日: 1992/11/25
公開日: 2011/09/20
ジャーナル フリーThree natural feldspars-albite, anorthite and microcline-are artificially weathered for 360 days using a Soxhlet extraction apparatus with distilled water and 0.1N HC1 solution. Testing results: 1) At the early stage of weathering, feldspars started to dissolve along thier cleavage while small etch pits appeared on flat cleavage surface. As weathering continues, a new products-boehmite-was formed on the feldspar surface. The reaction rate of anorthite was larger than the other feldspars, which was promoted by HC1 solution. 2) Boehmite was formed on all feldspars. However, in the case of anorthite, gibbsite and nordstrandite were formed additionally. 3) Kaoline minerals, the most populous clay minerals in naturally weathered feldepers, were not recognized in the present experiment. No kaoline minerals were produced due to the circulatation of the solution which was faster than in natural condition.
Early results suggest possible apprication for interpreting environmental influences of acid-rain.抄録全体を表示PDF形式でダウンロード (17560K) -
芝崎 靖雄, 劉 長連, 葛 文輝, 前田 雅喜, 刀根 如人, 加守 雅信1992 年 32 巻 2 号 p. 121-128
発行日: 1992/11/25
公開日: 2011/09/20
ジャーナル フリーSuzhou Kaolin, strongly coagulated and containing impurity minerals such as alunite, quartz and heavy minerals, had the difficulty of use as ceramic raw materials and has been mainly used for paper filler.
In order to use Suzhou Kaolin as ceramic raw materials it is necessary to improve the dispersion behavior and the purity. In the present study, we have examined the separability of the two kinds of deflocculants for Suzhou Kaolin, one is water glass and the other is the mixture of water glass and organic deflocculant. Suzhou Kaolin and the elutriated samples were characterized by XRD, thermal analysis, TEM, specific surface area, chemical analysis and titration. It was revealed that the impurity minerals such as alunite and quartz in Suzhou Kaolin were successfully eliminated by the elutriation with water glass and an organic deflocculant.抄録全体を表示PDF形式でダウンロード (2580K) -
宇野 泰章, 佐々木 孝彦, 立松 英信1992 年 32 巻 2 号 p. 129-138
発行日: 1992/11/25
公開日: 2011/09/20
ジャーナル フリーDehydration process of homo ionic smectites under static air and steam pressure has been investigated using micro-type and macro-type DTA apparatus and steam generator. Dehydration temperature of micro DTA curve in adsorbed and interlayer water region is 50-70°C lower than that of macro DTA curve. The dehydration patterns of adsorbed water in micro DTA curves of Na, K and Ca saturated samples under 1 atm steam pressure are similar to that of macro DTA curves under static air, however the third endthermic peak of Mg saturated specimen under steam pressure is higher than that in macro DTA curve under static air. Dehydration peak in structural water region of macro DTA curve in air appears in lower temperature compared with micro DTA curve under steam pressure. The differences may be influenced by self generated steam pressure in samples.While dehydroxylation temperature of Cheto specimen, having large layer charge, is lower than that of Tsukinuno specimen for Na, K, Mg and Ca saturated types. The results indicate that the temperature of endothermicpeak is affected by layer charge, exchange cations, relative humidity, heating rate and self generated vapor pressure.抄録全体を表示PDF形式でダウンロード (1171K) -
日本粘土学会ベントナイト利用研究小委員会 , 小川 進1992 年 32 巻 2 号 p. 139-145
発行日: 1992/11/25
公開日: 2011/09/20
ジャーナル フリーPDF形式でダウンロード (4060K) -
1992 年 32 巻 2 号 p. 145a
発行日: 1992年
公開日: 2011/09/20
ジャーナル フリーPDF形式でダウンロード (80K) -
1992 年 32 巻 2 号 p. 145
発行日: 1992年
公開日: 2011/09/20
ジャーナル フリーPDF形式でダウンロード (80K)
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