Mass transfer characteristics and evaluation of fault activity in the Neodani fault zone, central Japan

Kutsuna, Ryosuke*; Otani, Tomoyuki*; Kojima, Satoru*; Kakamu, Kazuhiko

Development of technique in order to judge the activities of fault using chemical characteristics of active faults is useful for the assessment of faults at geological disposal sites. In this study, element transfer at fault gauge in Neodani fault was examined. Fault gauge were consist of khaki and dark-gray alteration of layer and brown layer. The origin of dark-gray and brown layers are mudstone, and MnO contents were enriched from the source rock to the fault gauge. It is suggested that Mn-bearing minerals were precipitated from reduced groundwater at oxidized condition when fault gauge were formed.