塩類風化速度に与える岩石物性の影響に関する一実験  [in Japanese] Effect of Rock Properties on Rates of Salt Weathering : A Laboratory Experiment  [in Japanese]

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Abstract

7種類の岩石と硫酸ナトリウム溶液を用いて, 塩類風化の室内実験を行った. 実験は岩石供試体を溶液に浸したのちに乾燥させて硫酸ナトリウムの結晶を析出させるというサイクルを15回繰り返した. その結果, いくつかの岩石は徐々に風化・破壊していった. その風化速度を弾性波 (P波) 速度の低下によって把握した. 一方で岩石の物性を計測し, 風化速度との関係を吟味した. その結果, 岩石中に小さい間隙の量が多いほど, あるいは引張強度が小さいものほど, 塩類風化速度が大きくなる可能性のあることが示唆された.

To elucidate the effect of rock properties on rates of salt weathering, a laboratory experiment was carried out usingseven kinds of rock (two granites, two sandstones, welded tuff, tuff and porous rhyolite) and saturated salt solution ofNa2SO4. Some rock specimen had been gradually suffered salt fretting under the wetting and drying cycle condition. SinceP-wave velocity decreases due to salt fretting, the rate of weathering was obtained from the reduction rates of P-wavevelocity. On the other hand, several rock properties such as pore size distribution and rock strength were measured. Acomparison between the rate of salt weathering and rock properties suggests that salt weathering is more rapid in therocks with a larger proportion of micro-pores and/or lower tensile strength.

Journal

  • Journal of the Japan Society of Engineering Geology

    Journal of the Japan Society of Engineering Geology 46(2), 72-78, 2005-06-10

    Japan Society of Engineering Geology

References:  24

Cited by:  2

Codes

  • NII Article ID (NAID)
    110003374911
  • NII NACSIS-CAT ID (NCID)
    AN00026635
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    02867737
  • NDL Article ID
    7396361
  • NDL Source Classification
    ZM49(科学技術--地球科学--地質)
  • NDL Call No.
    Z15-263
  • Data Source
    CJP  CJPref  NDL  NII-ELS  J-STAGE 
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