巻号一覧
18 巻 (1978)
- 4 号 p. 121-
- 3 号 p. 75-
- 2 号 p. 31-
- 1 号 p. 1-
18 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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北川 隆司, 柿谷 悟1978 年 18 巻 2 号 p. 31-39
発行日: 1978/06/25
公開日: 2011/09/20
ジャーナル フリーThe constituent minerals of the white clay vein (ca. 6m in the vertical direction) and those in its surrounding granitic rock of the Hachihonmatsu district, Hiroshima Prefecture have been examined by the technics of X-ray powder diffraction, DTA, chemical analysis, electron-microscopic observation and measurement of abrasion pH etc., and the origin of the clay vein and the constituent minerals have been also discussed in this paper.
The clay vein mainly consists of halloysite, kaolinite and a small amount of quartz, while the clay minerals of weathered plagioclase in granitic rock surrounding the clay vein are of halloysite only. There are some morphological differences between the halloysite of the clay vein and that of weathered plagioclase, observed under the electron-microscop, and also the results of DTA, chemical analysis and abrasion pH show some differences between them.
It seems that the kaolin minerals in the clay vein are of hydrothermal origin and remaine unchanged through weathering.抄録全体を表示PDF形式でダウンロード (9310K) -
大森 啓一, 岡田 広吉1978 年 18 巻 2 号 p. 40-50
発行日: 1978/06/25
公開日: 2011/09/20
ジャーナル フリーAn old castle named Tagajo was founded between the 8th and 11th Centuries in Miyage Prefecture, Japan. Roofing tiles were unearthed from the ruins of castle and old oven, which were studied by mineralogical methods.
Roofing tiles used in the study were classified from archaeology into two groups, one of which was the I era tiles and the other the II, III and IV era tiles. Every tiles were 12 to 34mm in thickness. The I tiles were homogeneous with light dark color and the others inhomogeneous roughly with ashy color. In every tiles many porphyritic quartz crystals were found in association with plagioclase, hornblende, augite and magnetite under a microscope. Their groundmasses consisted of quartz and glassy materials.
Textures were found to be fluidal, banded and microfolded in the I tiles, and were more notable than those of the II to IV tiles. From X-ray diffraction patterns the presence of quartz, plagioclase, cristobalite and mullite was detected. From chemical analyses all compositions concentrated on a small area centered at 70% SiO2, 20% Al203 and 10% the others in the triangle phase diagram. Refractorinesses of every tiles were found to be under SK 26. Water absorptions of these tiles satisfies a requirement of the JIS standard for roofing tiles.
From these results it was found that the fired temperatures were between 1, 000° and 1, 200°C and the techniques making roofing tiles progressed from the I era to the II to IV eras.抄録全体を表示PDF形式でダウンロード (7660K) -
田崎 和江, 田崎 耕市, 小松 正幸1978 年 18 巻 2 号 p. 51-62
発行日: 1978/06/25
公開日: 2011/09/20
ジャーナル フリーVarious volcanoclastic and sedimentary rocks were dredged from southern part of the Mariana Trench by 17th cruise of R/V D. Mendeleev. Clay mineralogical investigation of seventeen samples made clear the presence of abundant montmorillonite and a trace of chlorite. Phillipsite is the most abundant zeolite. Clinoptilolite and chabazite are also recognized.
Occurrences of montmorillonite and phillipsite from deep sea sediments of the Pacific Ocean have been well established.抄録全体を表示PDF形式でダウンロード (12764K) -
江頭 和彦1978 年 18 巻 2 号 p. 63-67
発行日: 1978/06/25
公開日: 2011/09/20
ジャーナル フリーSurface properties between freeze-dried and air-dried clays were compared. Allophane and imogolite clays (<2μEm) were leached with 1M NaC1 and washed with or dialyzed against water. One part of these clays was freeze-dried and the other part air-dried. Water vapor adsorption and EGME and N2 surface-areas of both freeze-dried and airdried clays were measured.
The amounts of water vapor adsorbed at relative humidities of from 0.15 to 0.79 and EGME and N2 specific-surface-areas of freeze-dried and air-dried clays were almost the same with each other. The difference was only found at the amounts of water vapor adsorbed at a relative humidity of 0.93, which were larger for freeze-dried clays than for air-dried ones, especially for allophane. This difference was interpreted in terms of the difference in the interaggregate porosity between freeze-dried and air-dried clays.抄録全体を表示PDF形式でダウンロード (645K) -
長沢 敬之助1978 年 18 巻 2 号 p. 68-71
発行日: 1978/06/25
公開日: 2011/09/20
ジャーナル フリーOn the occasion of the Field Trip of the 20th Meeting of the Clay Science Society. of Japan, we visited Itabashi, Tochigi Prefecture, where a pile of weathered pyroclastics was exposed. It is composed of Shichihonzakura Pumice, Imaichi Pumice, Tawara Volcanic Ash, Takaragi Volcanic Ash and Kanuma Pumice in descending order. The Takaragi Volcanic Ash is composed of halloysite. Although the Kanuma Pumice is composed of allophane, halloysite was formed in its uppermost part along the boundary with the Takaragi Volcanic Ash. This fact seems to support the Kanno's opinion that halloysite is formed by resilication to which silica carried by percolating water is responsible. Allophane formation in the upper part of pyroclastic deposits and halloysite formation in the lower part of them may be coupled chemical reactions; silica released by allophane formation migrates downwards and is used for halloysite formation.抄録全体を表示PDF形式でダウンロード (5354K)
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