Timing of the cataclastic deformation along the Akaishi Tectonic Line, central Japan

Complete 40Ar resetting in an ultracataclasite by reactivation of a fossil seismogenic fault along the subducting plate interface in the Mugi Mélange of the Shimanto accretionary complex, southwest Japan

“…Similar complications that arise when dating brittle faults are addressed by isolating and dating a finegrained fraction (commonly finer than a few microns) of minerals from the fault rocks, based on the assumption that this fraction contains no detrital material (Lyons and Snellenburg, 1971;Kralik et al, 1987;Zwingmann and Mancktelow, 2004;Takagi et al, 2005). However, depending on the state of detrital material in the samples or the isolation process applied in preparation for dating, this fine-grained fraction could contain a component of detrital material (Tanaka et al, 1995;van der Pluijm et al, 2001). We therefore attempt to evaluate the amount of detrital material in the samples selected for dating.…”

Changes in illite crystallinity within an ancient tectonic boundary thrust caused by thermal, mechanical, and hydrothermal effects: an example from the Nobeoka Thrust, southwest Japan

“…Similar IC behavior near a fault core was reported, for instance, from the Matapedia fault in Canada (Duba and Williams-Jones, 1983), the Sashiu fault in Southwest Japan (Yamakita et al 1995), and the Akaishi Tectonic Line in central Japan . Tanaka et al (1995) argued that IC values increase toward the fault because muscovite crystals are buckled, fractured, and comminuted into finer grain sizes or replaced by fine crystals via hydrothermal alteration and the recrystallization of micaceous clay minerals. Although Hara and Kimura (2000) pointed out that lithological differences, deformation, hydrothermal alteration, and weathering are the controlling factors for IC value, we first focused on the effect of deformation and fragmentation due to the faulting before moving on to examine the other effects such as hydrothermal alteration on the basis of bulk-rock mineralogy.…”

Mineralogical Characteristics of Hydrothermal Laumontite and Adularia in the Breccia Zone of a Fault, Yangbuk-myeon, Gyeongju and Implications for Fault Activity

“…각 력대의 경우 투수성이 비지대에 비하여 크므로 단 층작용의 후기단계에서는 활발한 유체이동의 통로 가 되며, 맥상광물을 쉽게 형성한다 (Goddard and Evans, 1995). 열수유입은 단층활동에 의해 영향을 받은 열수유체가 투수성이 현저하게 증가된 단층 파쇄대로 유입되며, 단층분쇄물과 반응하여 점토광 물을 생성시키거나 (Tanaka et al, 1995;장태우와 추창오, 1998) (Steiner, I970;Browne, 1978;Cerny and Chapman, 1986;Dong and Morrison, 1995;Gudmundsson and Arnόrrsson, 2005 (Smith, 1974;Cerny and Chapman, 1986),…”