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Ishii, Eiichi; Matsuoka, Toshiyuki; Saegusa, Hiromitsu; Takeuchi, Ryuji
Nihon Oyo Chishitsu Gakkai Heisei-27-Nendo Kenkyu Happyokai Koen Rombunshu, p.135 - 136, 2015/09
no abstracts in English
Ishibashi, Masayuki; Sasao, Eiji; Yoshida, Hidekazu*
no journal, ,
no abstracts in English
Niwa, Masakazu; Tanabe, Hiroaki; Ishimaru, Tsuneari; Shimada, Koji; Ueki, Tadamasa*
no journal, ,
Fault gouge in granitic rocks is commonly clay-rich, as a result of fracturing and comminution caused by concentrated deformation and displacement, and subsequent retrograde hydration reactions. In some cases, fractures filled with clay minerals described as clay veins occur due to hydrothermal alteration. The hydrothermal clay veins associated with secondary shearing through old geologic time, or with secondary non-tectonic slips are often similar in appearance to typical fault gouges in active faults. Thus precise discrimination of active fault gouges from inactive clay veins is important for avoiding misleading estimates of seismic hazard. In this study, in-depth investigations were carried out on clay vein samples from the Hiroshima Granite, central Japan.
Tanabe, Hiroaki; Niwa, Masakazu; Ishimaru, Tsuneari; Shimada, Koji; Ueki, Tadamasa*
no journal, ,
An outcrop of an active fault geological feature gap and a heat water deterioration vein paid attention to clay vein of granite, and conducted a field survey for the purpose of the field sample extraction offered to a study of the material science-like value and judgment technique about the granite body you can expect to be distributed from documents in the past and research reports of existence, etc.. I'll report on those outcrop distribution situations by an announcement.
Ono, Takuya; Yoshida, Hidekazu*
no journal, ,
Very few studies have been performed to reveal characteristics and evolutions of water-conducting fractures in sedimentary rocks of accretionary complexes. Accretionary complexes can be a proposed site for geological disposal in Japan. Because of such backgrounds, we investigated fractures in borehole cores excavated from the Hyuga Group of the Shimanto Belt in the south of the Kyushu Island. Microscopic observation, SEM observation, XRD analysis and XRF analysis of minerals in/around fractures revealed characteristics of water-conducting fractures in accretionary complex and a process of fracture sealing according to carbonate mineral precipitation.
Ikemi, Hiroaki*; Pachri, H.*; Kokubu, Yoko; Mitani, Yasuhiro*; Kuroki, Takahito*
no journal, ,
One of issues in the comprehensive river-sediment management is to develop how to estimate a sediment production from a mountainous stream. In this study, beryllium isotopes of quartz extracted from sediment samples have been analyzed by JAEA-AMS-TONO to clarify a sediment dynamics in mountain streams. The sediment samples have been collected at four riverbeds and one hillslope in two different sub-catchments (A and B) of a Mesozoic granitic block located in the Umi-kawa river basin, Fukuoka. The sample of the catchment B shows a little bit higher value in 
Be-content than those of catchment A. This result indicates that the river sediment in the catchment B includes quartz grains that have been exposed on a ground surface for a long time compared with the catchment A. It is also possible that the river sediment in the catchments A contains more landslide materials because the landslide materials, which have come from a deeper part, might have a lower value in Be-content.