Characterization and Tectonic Significance of Low-Angle Fracture Distribution in the Upper Part of a Granite Body-New Insight from the Toki Granite around the Mizunami Underground Research Laboratory (MIU), Central Japan-

• KURIHARA Arata

  Japan Atomic Energy Agency

• AMANO Kenji

  Japan Atomic Energy Agency

• LIU Chunxue

  Environment and Resources, Yunnan University of Finance and Economics

• KOIKE Katsuaki

  Graduate School of Science & Technology, Kumamoto University

Bibliographic Information

Other Title

• 花崗岩体上部に発達する低角度亀裂の空間分布特性と地質学的解釈―瑞浪超深地層研究所周辺の土岐花崗岩からの知見―
• カコウガンタイ ジョウブ ニ ハッタツスル テイカクド キレツ ノ クウカン ブンプ トクセイ ト チシツガクテキ カイシャク ミズナミ チョウシンチソウ ケンキュウジョ シュウヘン ノ トキ カコウガン カラノ チケン
• New Insight from the Toki Granite around the Mizunami Underground Research Laboratory (MIU), Central Japan
• 瑞浪超深地層研究所周辺の土岐花崗岩からの知見

Abstract

The spatial distribution of hydrogeologically-relevant geological structures such as fracture and fault is usually very heterogeneous, varying, in general, according to geological history, scale of observation and rock type. With the objective of improving analytical methods to better understand structural heterogeneities, this paper describes the results of investigations of the spatial relationship between regional geological structures (Tsukiyoshi fault and Tsukiyoshi paleo-channel) and fracture density with special emphasis on low-angle fractures in the Toki granite, central Japan. As a result of the analysis, positive correlations between average of fracture spacing data and the horizontal distances from two regional geological structures have been observed. Because the positive correlations can be approximated with a polynomial function of the response surface, we have obtained an improved understanding of the spatial distribution of low-angle fractures with respect to the location of regional geological structures. We have interpreted that the observed spatial distribution of low-angle fracture density conforms to the tectonic setting, on the assumption that the Tsukiyoshi fault and Tsukiyoshi paleo-channel are probably associated with the pull-apart basin by strike-slip faulting from the past investigations and geophysical surveys for this research area. In addition, the proposed spatial modeling techniques and geological interpretations are able to evaluate certainty of interpreted faults and fractures distributions, quantify general trend in structural heterogeneities and detect unknown faults.

Journal

• Journal of MMIJ

  Journal of MMIJ 124 (12), 710-718, 2008

  The Mining and Materials Processing Institute of Japan

Keywords

• Low-Angle Fracture
• Tsukiyoshi Fault
• Tsukiyoshi Channel
• Pull-Apart Basin
• Fracture Spacing
• Response Surface

Details

• CRID: 1390001205273861376
• NII Article ID: 10023988883
• NII Book ID: AA12188381
• DOI: 10.2473/journalofmmij.124.710
• ISSN: 18840450
• ISSN: 18816118
• NDL BIB ID: 9771214
• Web Site: http://id.ndl.go.jp/bib/9771214
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I9771214
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed