The Journal of the Geological Society of Japan 123(7) 533-549 2017
<p>The Iragawa mylonite zone is ~2.5 km long (N-S) and ~350 m wide, and occurs in the Cretaceous Shirakamidake granitic complex along the western coastline of southernmost Aomori Prefecture, Northeast Japan. As already reported and confirmed by ma...
Re-examination of the movement history of the Median Tectonic Line in Ina area
Project Year: Apr 2015 - Mar 2018
From this research, the researcher got the following two results.1. One of the faults along the Median Tectonic Line (MTL) transects a terrace deposit at Hiji Outcrop. We extracted volcanic glass shards from the deposit and determined bulk chemica...
Exhumation processes of the high-P metamorphic rocks constrained by integrated radiogenic ages of zircon in the clasts of the Miocene conglomerates
Project Year: Apr 2011 - Mar 2014
Exhumation processes of high pressure type metamorphic rocks (Sanbagawa metamorphics) was examined using various radiogenic dating method (phengite K-Ar, zircon fission-track and zircon U-Pb) for the schist samples from exposures and from the clas...
Determination of the history of fault activity using pseudotachylyte from the Median Tectonic Line and from the Atotsugawa Fault
Fission-Track (FT) ages for zircon in granitic rocks along the MTL and Atotsugawa Fault were determined. The FT ages for the MTL yield about 60 Ma, suggesting the oldest brittle deformation along the MTL, whereas those for the Atotsugawa Fault yie...
Internal Structure of the Median Tectonic Line fault zone revealed by analysis of continuous borehole core
A drill hole penetrates the Median Tectonic Line (MTL) at 473.9m depth which is the boundary between the Ryoke granitic rocks and the Sanbagawa metamorphic rocks. The internal structure of MTL fault zone was revealed by the drillcore samples, and ...
Reconstruction of the paleostress field on the basis of 3-D analyzes of healed miocrocracks in granitic rocks
To estimate the influence of the bending of the Median Tectonic Line(MTL) by the late Miocene collision of the Izu-Ogasawara arc, we examined the 3-D orientations of healed microcracks in the Ryoke granitic rocks and the Tanzawa Tonalite and deter...
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