Abstract
CHIME (chemical Th-U-total Pb isochron method) dating of garnet-granite, which is exposed in the southernmost part of the Naguri Fault Zone in the Kanto Mountains, was carried out by precise microprobe analysis of zircon grains. The CHIME age is 432±40 Ma. This age is concordant with that of granitoids (378-447 Ma) of the Kurosegawa Terrane in the other areas of Southwest Japan. It is a conclusive evidence indicating that the Naguri Fault Zone represents an eastern extension of the Kurosegawa Terrane, in addition to the other characteristics such as the tectonic situation of the Naguri Fault Zone, mode of occurrence as well as petrography and petrochemistry of rocks occurring in this fault zone.
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