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Title Transcription
シラス ノ レンゾク コア シリョウ ニ オケル テクスチュア ト コウドチ ノ ヘンカ
Title Alternative
Changes of textures and hardness distribution in a borehole core sample of“Shirasu”(rhyolitic ignimbrite tuff)
File
language
jpn
Author
Yokoyama, Osamu
Yokota, Shuichiro
Takeda, Shinji
Description
Although it is generally easy to obtain small non-disturbed specimens of soft rocks of weakly welded ignimbrite tuff from exposures,it is virtually impossible to acquire complete borehole core samples of “Shirasu”,the Quatemary rhyolitic
ignimbrite tuff which is widely distributed in southern Kyushu,Japan.This difficulty is attributable to the quality of the rocks,in which volcanic glass and coarse-grained materials with large pumiceous fragments are weakly welded to each other.The rocks are therefore soft and tend to break under external forces orvibrations.
A new sampling technique,the Hybrid Method,which is based on air bubble drilling,has recently been developed.This enables us to obtain complete core samples of “Shirasu”.A continuous non-disturbed core sample 100 cm long was obtained from southern Kyushu using this method.Rock textures were observed in addition to measurements of penetrative hardness distribution in the core.Images obtained under the optical microscope and by SEM shows charactehstic piled textures of volcanic glasses of bubble wall type,and welded textures.Distribution of penetrative hardness values shows that this parameter varies from 0.1 kgf/cm to 35 kgf/cm in these rocks.
Journal Title
島根大学地球資源環境学研究報告
Volume
20
Start Page
153
End Page
161
ISSN
13439774
Published Date
2001-12-28
NCID
AA11455176
Publisher
島根大学総合理工学部地球資源環境学教室
Publisher Aalternative
Department of Geoscience, Interdisciplinary Faculty of Science and Engineering, Shimane University
NII Type
Departmental Bulletin Paper
OAI-PMH Set
Interdisciplinary Graduate School of Science and Engineering
Remark
12-14,16+ / 1993+
中山勝博助教授追悼特集
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