淡路島中央部の領家帯 : 特に花崗岩類の区分と相互関係について

概要

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The Ryoke Belt in the central part of the Awaji Island is composed mostly of granitic rocks with minor amounts of metabasites and metasediments. The Sennan Group is found at the southern border of the Ryoke Belt, and the granitic rocks and the Sennan Group are intruded by many dykes of two stages, the older and the younger. The granitic rocks can be divided into six rock-masses which are grouped as follows, based on their stages of intrusion; 1 st stage Shioo and Tsushigawa granites 2 nd stage Shizuki, Sumoto and Ei granodiorites 3 rd stage Senzan granite The first stage granites are intruded by dykes of the older stage and granitic rocks of the second to third stages. The second stage granodiorites intrude also into the older stage dykes and the Sennan Group which consists of acid pyroclastics. The Senzan granite of the third stage is massive and intrudes discordantly into the Sumoto granodiorite of the second stage as well as the Tsushigawa granite of the first stage. The first stage granites, the dyke rocks of the older stage and the Shizuki granodiorite of the second stage are more or less mylonitized and schistose. It is considered that the main mylonitization in the area took place under a condition of relatively low temperature before the intrusion of the Ei granodiorite.
地学団体研究会の論文
1985-03-25