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Volume 27 (1987 - 198･･･
- Issue 4 Pages 199-
- Issue 3 Pages 135-
- Issue 2 Pages 53-
- Issue 1 Pages 1-
Volume 27, Issue 2
Displaying 1-6 of 6 articles from this issue
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Keinosuke NAGASAWA1987 Volume 27 Issue 2 Pages 53-61
Published: June 10, 1987
Released on J-STAGE: September 20, 2011
JOURNAL FREE ACCESSGeology and mineralogy of kaolin deposits and kaolinitic clay deposits are reviewed. They are classified as follows.
1. Deposits of primary kaolin
1.1 Deposits of combined hydrothermal-weathering origin
1.2 Residual deposits mainly formed by tropical weathering
1.3 Solfataric deposits formed by shallow hydrothermal action
2. Deposits accompanied by sandy sediments
2.1 Sedimentary kaolin deposits
2.2 Kaolinitic sand with kaolinization either before or after sedimentation
3. Kaolinitic clay deposits accompanied by coal or lignite
3.1 Ball clay, i. e., plastic carbonaceous clay
3.2 Fireclay including high-alumina fireclay and flint clay
3.3 Tonstein and allied clay of volcanic-ash originView full abstractDownload PDF (2448K) -
Masaharu KAMITANI1987 Volume 27 Issue 2 Pages 62-71
Published: June 10, 1987
Released on J-STAGE: September 20, 2011
JOURNAL FREE ACCESSMany bauxite deposits, high aluminous shales, are distributed in Sino-Korean and Yangtze paraplatforms in China. Most of them cover unconformably the Ordovician and Silurian systems, and are stratigraphically correlated to the middle to upper Carboniferous age.
The bauxite ores in Jiaozuo and Xiaoguan areas, Henan province, are composed mainly of diaspore, in association with 2M type sericite, pyrophyllite and kaolinite. Fe/Mg chlorites, geothite and hematite are dominant in the lower part of the bauxite layers and in the ferrugineous clay beds accumulated on karst sinkholes. The occurrence of ore deposits and their mineral association suggest that the bauxite were formed under a low pH and low Eh condition in the large-scale karst basins consisting mainly of the Ordovician limestones.View full abstractDownload PDF (12371K) -
Nobuyuki HARUTA1987 Volume 27 Issue 2 Pages 72-87
Published: June 10, 1987
Released on J-STAGE: September 20, 2011
JOURNAL FREE ACCESSTwo kaolin deposits, one from New Zealand and the other from Australia, have been described with reference to the occurrence, the geology and mineralogy, the mining output, the quality as the raw materials for whitewares, the economical (or trading) aspects, etc. The clays from both deposits contain only a little Fe2O3 and TiO2 and, so, are best suitable for obtaining whitewares of good quality.
1. New Zealand kaolin
The mine is located in Matauri Bay area, Northland, owned by New Zealand China Clays Ltd. The kaolin deposit was formed by hydrothermal alteration followed by weathering, and is composed of halloysite and quartz, with some amounts of cristobalite and feldspars. The latter three minerals are removed effectively, and the clay material (<2μm halloysite) is concentrated up to 98% on the dry matter basis.
2. Australian kaolin
The mine is located in Greenbushes Mineral Field, in the southwest of W. Australia, owned by Greenbushes Tin Ltd. The deposit was formed by weathering of feldspars in pegmatite body, and is composed of kaolinite and quartz, with muscovite and feldspars as accessory components. The deposit is exported to Japan just as mined.View full abstractDownload PDF (10624K) -
Its contribution to the study of biological effects of fibrous mineralsNorihiko KOHYAMA1987 Volume 27 Issue 2 Pages 88-103
Published: June 10, 1987
Released on J-STAGE: September 20, 2011
JOURNAL FREE ACCESSThere are many recognized diseases arising from the inhalation and retention of dust particles in the lungs. Asbestos has been well known as an carcinogenic silicate fiber, and nowadays much attention is paid to Stanton and Pott's suggestion that mineral fibers other than asbestos might be also the cause of mesotheliomas. The aim of mineralogical study of lung dust is to provide a more accurate information on the patient's exposure to such hazardous dust. The history of such mineralogical study is closely linked to the development of analytical techiniques, and the application of analytical electron microscopy in this field has made a great contribution for the proof of carcinogenesity of asbestos.
This aricle reviewed the mineralogical study on the diseases related to asbestos exposure and introduced the author's some studies on the evaluation of the exposure to asbestos and other dust particles, which can be correlated with the progression of the patient's diseases involved in asbestosis, mesothelioma, and other lung diseases, by means of anlytical electron microscopy as well as the improvement of some tissue preparation methods.View full abstractDownload PDF (9763K) -
Junji AKAI1987 Volume 27 Issue 2 Pages 104-116
Published: June 10, 1987
Released on J-STAGE: September 20, 2011
JOURNAL FREE ACCESSRecent progress in characterization of phyllosilicates and related minerals in carbonaceous chondrites is reviewed.
Detailed mineralogical investigations of matrix phyllosilicates and related minerals in carbonaceous chondrites have been carried out especailly by the use of high resolution electron microscope (HREM) with energy dispersive Spectrometer (EDS) for a last decade. It has been clarified that the platy phyllosilicates in carbonaceous chondrite matrix are mostly Fe-rich serpentine. In chondrule groudmass, the presence of 14 Å chlorite was recently confirmed. Another topic on the matrix minerals in carbonaceous chondrite was the discovery of 11 Å and 17 Å phase, which were suggested to be tochilinite and tochilinite-serpentine, respectively. The geneses of these minerals were discussed.
Recently unique C2 chondrites of Y-793321 and B-7904 were found. They do not contain normal phyllosilicates, but intermediate minerals, the presence of which suggests transformation from serpentine to olivines. The possible genesis of this thermal event was discussed.View full abstractDownload PDF (15591K) -
Takehisa MAEDA, Yasuo SHIBASAKI, Hajime KUMAGAI1987 Volume 27 Issue 2 Pages 117-125
Published: June 10, 1987
Released on J-STAGE: September 20, 2011
JOURNAL FREE ACCESSIn order to know the difference of properties among the ceramic clay materials from different localities, plastic clays from Seto, Tono, and Iga districts, were analized for pH (H20, KC1) electric conductivity, CEC, and extractable cations. Reagents used for the extraction of cations were water, O. IN HCl, IN CH3COONH4 and IN KC1. The results obtained are summarized as follows:
I. The total amount of the soluble cations increased in the order of Seto-<Tono-<Iga-clay.
2. Seto-clay, one of the clays of best quality and of widest use for ceramic industries in Japan, contained high content of exchangeable and water soluble K ion as compared with Iga-and Tono-clay.
3. The clay having low pH (KC1) and a large exchange acidity (pH (H20)-pH (KC1)) showed poor dispersion and high viscosity in water.
4. Iga-clay was least in the amount of KC1-extractable Al, and highest in the amounts of KC1-extractable Fe and water-soluble organic matter, among the clay samples examined.
The observed differences of the clay samples from the different districts were discussed in relation to their genesis or the environment of deposition.View full abstractDownload PDF (943K)
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