Gokasho- Arashima Tectonic Line, as a serpentinite melange zone, in the Shima Peninsula, southwest Japan.

Shima Peninsula occupies the E end of the Kii Peninsula, SW Japan. There, the Chichibu terrain, composed mainly of the late Paleozoic to middle Mesozoic Chichibu Complex, is divided into the northern, middle and southern subbelts by longitudinal faults. Each subbelt trends ENE-WSW. A serpentinite belt called the Gokasho-Arashima Tectonic Line (G-A Line) runs through the middle subbelt in the NE-SW, direction namely slightly oblique to the general trend of this subbelt. Many longitudinal faults, mostly accompanied by thin belts or lenses of serpentinite, branch off from the G-A Line into the SE side. They dissect the Chichibu Complex and the lower Cretaceous cover into numerous tectonic slices separated or partly enclosed by serpentinite. No such faults extend into the NW side. Based on the mode of occurrence of serpentinite at the western terminal of the G-A Line, the possible western extension of this line is suggested.-from English summary