Temporal Changes in Some Rock Properties of Sandstone Gravel due to Weathering.

• NISHIYAMA Ken-ichi

  Disaster Prevention Research Institute, Kyoto University

• MATSUKURA Yukinori

  Institute of Geoscience, University of Tsukuba

Bibliographic Information

Other Title

• 風化による砂岩れきの物性変化速度
• フウカ ニ ヨル サガンレキ ノ ブッセイ ヘンカ ソクド

Abstract

Temporal changes in rock properties due to weathering during 350 ka were examined using sandstone gravel in fluvial terrace deposits with a known emergence time which were distributed in the Miyazaki Plain, South Kyushu.<BR>The physical and mechanical properties and the colour index of b*-value change during the 0-to 120-ka period. The patterns of temporal changes in these rock properties are similar. The colour index of a*-value and pore radius change during 250-to 350-ka period. These results show that connected pores and content of hematite increase during 250-to 350-ka period. The specific surface area and the chemical weathering indices change at constant rates during 350 ka. This pattern suggests that chemical reactions occurred actively at the surface of the minerals with a large specific surface area. Since the specific surface area of sandstone increases at a constant rate during 350 ka, the chemical weathering indices change at a constant rate during 350 ka.

Journal

• Journal of the Japan Society of Engineering Geology

  Journal of the Japan Society of Engineering Geology 43 (4), 216-225, 2002

  Japan Society of Engineering Geology

Keywords

• weathering rate
• sandstone
• rock property

Details

• CRID: 1390282679072452096
• NII Article ID: 110003335657
• NII Book ID: AN00026635
• DOI: 10.5110/jjseg.43.216
• ISSN: 18840973
• ISSN: 02867737
• NDL BIB ID: 6326793
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I6326793
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed