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ID 52872
file
title alternative
On Some Kaolin Deposits Related to the Granite in Chûgoku District, Japan.
creator
MATSUMOTO, Kanzo
abstract
The granitic rocks occurring in Chugoku District are classified into three units, that is the granitic rocks belonging to the "Yakuno Intrusive Rocks", the "Ryoke Granitic Rocks" and the "Chûgoku Batholith". The last one is divided further into three groups or plutonic complexes : the Hiroshima granitic complex, the central plutonic group and the San'in granitic complex. Most of the kaolin deposits within Hiroshima and Shimane Prefectures are found in the "Chûgoku Batholith"; they have hitherto been found in the central plutonic group and the San'in granitic complex. While a small number of kaolin deposits showing similar occurrence are also observed in other kind of rocks, for instance, at Toyosaka and Kôtachi. Genetic relation between pyrophyllite deposits prevailing in rhyolitic rocks of Chûgoku District and the kaolin deposits remains not ascertained. On the basis of altered states of the surrounding rocks, the deposits in question are infered to have been formed by ascending spring containing CO2 along with surface weathering. The minerals of the deposits have been identified to halloysite, sericite, secondary quartz, kaolinite, relics of primary quartz, and unaltered feldspars by means of chemical analysis, differential thermal analysis, X-ray analysis and electron-microscopy.
description
今村外治教授退官記念特集号
journal title
Geological report of the Hiroshima University
issue
Issue 14
start page
385
end page
395
date of issued
1965-02-22
publisher
廣島大學理學部地學教室
issn
0073-2303
ncid
language
jpn
nii type
Departmental Bulletin Paper
HU type
Departmental Bulletin Papers
DCMI type
text
format
application/pdf
text version
publisher
department
Graduate School of Science
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