Bulletin of the Geological Survey of Japan Top Page

Bulletin of the Geological Survey of Japan Vol.73 No.4 (2022)

Cover figure | Table of Contents | Abstract

Cover figure

Sites in the Kiryu and Ashikaga District, southwestern Ashio Mountains

Sites in the Kiryu and Ashikaga District, southwestern Ashio Mountains

A Jurassic accretionary complex is widely distributed throughout the Ashio Mountains in Gunma and Tochigi prefectures. The field excursion guide (Ito, 2022, Bulletin of the Geological Survey of Japan, 73(4), 143–192) introduces 14 sites including outcrops and routes where the characteristic lithology and stratigraphy of an accretionary complex can be observed. The locations of each site, together with outcrop photographs and thin-section photomicrographs, were added to the aerial photograph published by the Geospatial Information Authority of Japan (https://maps.gsi.go.jp/).

(Figure and Caption by ITO Tsuyoshi)

Table of Contents

All the pages PDF ： 73_04_full.pdf ［46MB］

TitleAuthorPDF
Note and Comment
Field excursion guide: Jurassic accretionary complex in the Kiryu and Ashikaga District, southwestern Ashio Mountains, central Japan ITO Tsuyoshi (p143–192) 73_04_01.pdf [44MB]

Abstract

Field excursion guide: Jurassic accretionary complex in the Kiryu and Ashikaga District, southwestern Ashio Mountains, central Japan

ITO Tsuyoshi

Jurassic accretionary complex of the Ashio Belt is widely exposed in the Kiryu and Ashikaga District, southwestern Ashio Mountains, central Japan. The Jurassic accretionary complex in the district comprises the Kurohone–Kiryu, Omama, Kuzu and Gyodosan complexes. The Ashikaga body, composed of Late Cretaceous granodiorite, is intruded in Nagusa, Ashikaga City. This field excursion guide introduces 14 sites including outcrops and routes where the characteristic lithology and stratigraphy of an accretionary complex can be observed.