Alteration of Subsurface Granitic Rock in Okayama Area, Japan
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- YOSHIDA Hidekazu
- Nagoya University Museum, Material Research Section
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- NISHIMOTO Shoji
- Nagoya City Science Museum
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- CHO Akio
- Institute for Geo-Resources and Environment, GSJ
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- YAMAMOTO Koshi
- Nagoya University, Graduate School of Environmental Studies
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- KATSUTA Nagayoshi
- Gifu University, Faculty of Education
Bibliographic Information
- Other Title
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- 地下花崗岩体の変質とその形態―産総研岡山応力測定用深部花崗岩コア試料の変質を例に―
- チカ カコウガンタイ ノ ヘンシツ ト ソノ ケイタイ サンソウケン オカヤマ オウリョク ソクテイヨウ シンブ カコウガン コア シリョウ ノ ヘンシツ オ レイ ニ
- 産総研岡山応力測定用深部花崗岩コア試料の変質を例に
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Abstract
In order to understand the alteration process in subsurface granitic rocks, drilled core (100 meters deep) taken from Mesozoic granitic rock distributed in the Chugoku area of Japan has been investigated. The rock is characterized by the coarse size of rock-forming minerals such as quartz, plagioclase, orthoclase and biotite. The borehole logging and core observations show that there are several fractured zones, and almost all these structural features are associated with alteration zones that have been formed by water-rock interaction. The studied samples were collected from the altered zone at the location of 40 to 50 meters below the ground surface. Detailed analysis of the pore geometry, mineralogical observation and geochemical analysis were carried out to reveal the changes of textual and geochemical characteristics due to water-rock interaction. Alteration feature of rock-forming minerals such as plagioclase and biotite shows that the granitic body has two stages of thermal and water-rock interactions. One is the high-temperature hydrothermal alteration after the magma solidification, and the other is relatively low-temperature alteration probably due to groundwater circulation after the being exposed at the surface. This kind of methodology used for rock forming minerals of subsurface granitic rock can be applied to understand the alteration history due to the water-rock interactions during the formation of granitic body.
Journal
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- Journal of the Japan Society of Engineering Geology
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Journal of the Japan Society of Engineering Geology 49 (5), 256-265, 2008
Japan Society of Engineering Geology
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Details 詳細情報について
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- CRID
- 1390282679072419328
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- NII Article ID
- 110007008449
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- NII Book ID
- AN00026635
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- ISSN
- 18840973
- 02867737
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- NDL BIB ID
- 9746116
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed