A Method to assess the activity of crush zones alternative to the application of overlying sediments

Shimada, Koji   ; Sueoka, Shigeru   ; Ishimaru, Tsuneari 

The application of overlying sediments is one of the methods defining relative age based on the principle of cross-cutting relations. This principle is one of the geological principles indicating relative age of deformation features such as faulting or tectono-metamorphic textures. The application of overlying sediments and relative age determination of deformation features are also based on the principle of cross-cut relations. We present a method utilize relative deformation age by means of the cross-cut relations, temperature gauges shown by structures, and thermal history of geological body alternative to the application of overlying sediments. Research area is located near the FBR Monju. Data suggest that the activity of crush zones precede basaltic dyke formation under higher temperature environment. This research method is potential alternative, though case study is needed towards overcoming the unsuitable outcropping situation to grasp basic geological data.