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Kanno, Mizuho; Niwa, Masakazu; Shimada, Koji; Tateishi, Ryo*
no journal, ,
It has been reported that there is a slight difference in the chemical composition of the whole rock between the fault gouge generated by fault activity and the uncrushed host rock. The reason for this is not clear, but since many fault gouges are rich in clay minerals, it is possible that the elements adsorbed on the surface of the clay minerals have some effect. Therefore, exchangeable cations were extracted by substituting cesium ions, which are easily adsorbed on the clay mineral surface, for the fault gaudis of active faults and inactive faults, and compared with the whole rock composition. A concentric logarithmic ratio transformation was used for the comparison. As a result, the concentration of inactive faults tended to be higher than that of active faults in Rb.
Tsukahara, Yuzuko; Kanno, Mizuho; Goto, Akira; Fujita, Natsuko; Komatsu, Tetsuya; Maemoku, Hideaki*
no journal, ,
Holocene crustal movements are recorded as fossil calcareous assemblages on rocky coast. It is possible to reconstruct crustal movements by summarizing these heights, structures and 
C ages. In this study, to clarify crustal movements, we collected calcareous assemblages and dated them using the C at Cape Hane. C ages show forming period of the lowest wave-cut-bench. However, it is difficult to determine the history of emerged events in a short cycle. To reconstruct the crustal movement history precisely, it is necessary to identify obvious multi-layer structures or discontinuous surfaces with time interval.