@article{oai:kanazawa-u.repo.nii.ac.jp:00010471,
 author = {森下, 知晃},
 issue = {3},
 journal = {地質学雑誌 = Journal of the Geological Society of Japan},
 month = {Jan},
 note = {A serpentinized cataclasite characterized by many angular harzburgite clasts of various size in serpentine matrix was found as an alluvial boulder in the Horoman peridotite complex, Hokkaido, northern Japan. A computer-aided image analysis of the serpentinized cataclasite indicates that clast shapes do not change with size variations, and that clast-size distributions obey a modified power-law distribution of Nagahama ct al. (1994). The serpentine matrix of the serpentinized cataclasite shows no distinct structures such as foliation and lineation, and has few fine-grained peridotite clasts (>10μm) and their pseudomorphs, whereas cataclasite matrix at an outcrop of the Horoman complex is almost all occupied by pseudomorphs of fine-grained peridotite clasts. The size distribution of mesoscopic clasts (visible to the naked eye) in the serpentinized cataclasite is similar to that of microscopic peridotite clasts (visible under microscope) in the serpentine matrix, but is different from that of microscopic fine grains bounded by serpentine mesh in clasts of the serpentinized cataclasite, These lines of evidence suggest that the serpentine matrix of the serpentinized cataclasite (more than 50% of the rock) had been once occupied by very fine-grained peridotite clasts (<10μm) formed by fragmentation of the peridotite during faulting before the serpentinization. Deficiency of smaller clasts on clast-size distributions is, therefore, interpreted as resulting from selective serpentinization of very fine-grained peridotite clasts, but not from normal serpentinization of the peridotite under static conditions. Fluid must have been locally supplied in the fault zone for a short period during or after the brittle deformation to cause the serpentinization. 北海道の幌満かんらん岩体から, 蛇紋石マトリクス中にさまざまなサイズのかんらん岩角礫片を含むカタクレーサイトの転石を採取した.画像解析から, 岩片の形がサイズによらず不変であること, 岩片の粒径分布が修正フラクタル分布式(長濱ほか, 1994)に従うことが示された.露頭から採取したカタクレーサイトとの比較や, メソおよびミクロスケールでの粒径分布などからみて, 本岩石の形成は, かんらん岩の静的な蛇紋岩化だけでは説明されず, 断層運動によって多量のかんらん岩極細粒子(マトリクス)が形成され, それらが選択的に蛇紋岩化を受けた結果であると推定される.蛇紋岩化を起こした流体はカタクレーサイト形成とほぼ同時もしくはその後に破砕帯に短時間供給された.},
 pages = {223--233},
 title = {幌満かんらん岩体の蛇紋岩化したカタクレーサイト転石の記載岩石学的特徴},
 volume = {106},
 year = {2000}
}