Pre-Jurassic klippe in northern Chichibu Belt in west-central Shikoku, southwest Japan - Kurosegawa Terrane as a tectonic outlier of the pre-Jurassic rocks of the Inner Zone

Abstract

The Kurosegawa Terrane consists of various types of rocks which rocks occur mostly in the central portion of the Chichibu Belt in the Outer Zone of Southwest Japan. A remarkable klippe composed of the Kurosegawa rocks is delineated in the Chichibu Belt in Shikoku, through K-Ar dating of weakly metamorphosed accretionary complex rocks. In addition to lithologic similarity with the pre-Jurassic rocks of the Inner Zone of southwest Japan, field relations in the study area suggest that the Kurosegawa Terrane forms a gigantic klippe-like tectonic outlier of the pre-Jurassic complexes. -from English summary