淡路島北部の領家花崗岩類

概要

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The Ryoke Belt in the northern part of the Awaji Island is composed mostly of granitic rocks associated with minor amounts of metabasites and metasediments and intruded by many dykes of two stages. The granitic rocks can be divided into those of three stages and six rock-masses as follows; 1st stage Tsushigawa granite 2nd stage Shizuki granodiorite, Nojima granodiorite and Iwaya granite 3rd stage Tosanji and Shigetani granites. The Tsushigawa granite of the first stage occurs as xenoliths in the granitic rocks of the second stage and is intruded by dykes of the older stage. The granitic rocks of the second stage are widely exposed in the northern part of the Awaji Island. Among them, the Nojima granodiorite-mass shows a zonal arrangement ranging in composition from granodiorite at the outermost part (the Jyoryuji granodiorite) to aplitic granite at the central part (the Nadagawa aplitic granite). The third stage granites are fine grained and massive, and occur as a small stock or a dyke-like mass which intruded discordantly into the granitic rocks of the first to second stages.
地学団体研究会の論文
1986-07-25