[O-05] Understanding of formation process of Japanese archipelago from Japanese Geoparks

[O05-03] A way of life on the accretionary prism at Geoparks and Geoparks project areas in Shikoku island.

★Invited Papers

*Azusa Tonotani¹, Satoru Imai², Takumi Sakakiyama³, Tsubasa Ogasawara⁴ (1.Tourism strategy division in Miyoshi city offce, 2.Tosashimizu Geopark Plan Promotion Committee, 3.Seiyo city Geopark Promotion Office, 4.Muroto Geopark Promotion Committee)

Keywords:Geopark, Accretionary prism in Shikoku

An accretionary prism is that sedimentary rocks and volcanically products on the ocean plate added under the continental plate. Land of Shikoku island consists of accretionary prisms 60% or more.

The north boundary of the accretionary prism in Shikoku island is Japanese median tectonic line (MTL), which mostly runs to an east-west direction in Shikoku island. The greater part of south area of MTL consists of accretionary prism, which were formed during a variety of age. Geological regions in this accretionary prism are divided into Sambagawa belt, MIkabu belt, Chichibu belt, Kurosegawa belt and Shimanto belt, respectively. Those geological regions distribute east-west direction, and formation ages show the more young towards to south region with the exception of a few regions.

Geoparks and Geopark project areas in Shikoku island almost are located on accretionary prism. On those Geoparks and Geopark project areas, we can feel unique ecosystems, historical and cultural life, which closely connects geology and landscape.

In this presentation, we introduce that the unique ecosystems, historical and cultural life were developed on the accretionary prism through Geoparks and Geopark project areas in Shikoku.