巻号一覧
14 巻 (1974 - 1975)
- 4 号 p. 99-
- 3 号 p. 71-
- 2 号 p. 35-
- 1 号 p. 1-
14 巻, 4 号
選択された号の論文の3件中1～3を表示しています
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笹木 敏1975 年 14 巻 4 号 p. 99-108
発行日: 1975/02/25
公開日: 2011/09/20
ジャーナル フリーMicro spherules (5-10μ in diameter) were found in “Kitami clay” using the scanning electron microscope. These micro spherules analysed by electron probe Xray, contain Si, Al and O. Trace elements are Fe, Ti and K.
These micro spherules are divided into 6 type by scanning electron microscope. Grain size distribution of the micro spherules was obtained by opitical microscope.
There are two possibilities of the origine of the micro spherules namely volcanic and organic. The volcanic origine is presumed by geological examination for the following reasons,
1. Kitami clay is a weathering product from Kutcharo volcanic ase (K4).
2. Micro spherules are found in lower layer (K4) of Kitami clay.
Some micro spherules may be a kind of pollen fossiles judging from its form and size. The certain origine of the micro spherules in Kitami clay needs more study.抄録全体を表示PDF形式でダウンロード (17532K) -
阿部 利彦, 鳥居 一雄1975 年 14 巻 4 号 p. 109-115
発行日: 1975/02/25
公開日: 2011/09/20
ジャーナル フリーThe background intensity of X-ray diffraction is affected by both of amorphous materials and co-existence elements. When the samples contain heavy elements, generally a background intensity decrease because of absorption effect, however it sometimes increase with fluorescent X-ray, for instance, Fe-Kα, β generate when a Fe contained sample is radiated by Cu-Kα.
In order to investigate the effect of amorphous silica and Fe2O3 on the background intensity, two kinds of samples were prepared, one was mixture of α-quartz, α-cristobalite and Fe-Si-gel (contain Fe2O3), another samples were natural quartzites. The investigation of these samples showed that the intensity of Fe-Ka, p increase according to diffraction angle 2θ, whereas the main peak of diffraction ring of amorphous silica is obserbed about 2θ=23°.
Thus amorphous silica and Fe2O3 show different effects on a distribution of background intensity, so it is possible to determine these contents from two background intensities of which 2θ are different. The high angle background in this paper is the value of 2θ=39.8° and the low angle is 22.8°. As the content of a-cristobalite has influence on the latter value, which is corrected with that content calculated by Xray diffraction method.
The results of above investigations are as follows.
1) The background intensities of 2θ=39.8° and 22.8° are both affected by the contents of Fe2O3 and amorphous silica, but the former mainly propotional to Fe2O3% and the latter to amorphous silica % respectively.
2) The relation between Fe2O3%, amorphous silica % and two background intensities can be expressed with the equation (1).
Fe2O3 %=A1I22.8+E1I39.3+C1
Amorphous silica %=A2I22.8+B2I39.8+C2
A1-C2; coefficients
I22.8, I39.8; back ground intensities抄録全体を表示PDF形式でダウンロード (703K) -
音馬 峻, 竹 滋雄1975 年 14 巻 4 号 p. 116-126
発行日: 1975/02/25
公開日: 2011/09/20
ジャーナル フリーChemical compositions, physically adsorbed waters and hydroxyl contents were measured for 14 chrysotiles, which were selected from main chrysotile deposits of the world, and which contain less amounts of impurity minerals. Before chemical analysis the samples were refined to reduce impurities.
It was revealed that chrysotile contains less than 2.5% of Al2O3+Fe2O3+FeO, and in these oxide the relation of Fe2O3>Al2O3 is recognized for chrysotile compared with the relation of Fe2O3<Al2O3 for antigorite, and FeO/(Fe2O3+FeO)>0.1 for chrysotile compared with FeO/(Fe2O3+FeO)<0.1 for lizardite and 6-layer serpentine.
The content of SiO2 and MgO were also close to the theoretical value of chrysotile, but the contents of octahedral ions were slightly higher than tetrahedral ions. The amounts of physically adsorbed H2O were between 0.49% and 0.89% and also contained less than 0.7% of chemically combined excess water.
The correlation between the softness of chrysotile and chemical composition was confirmed in Al2O3 content but not in chemically combined water.抄録全体を表示PDF形式でダウンロード (3463K)
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