グリーンタフ地域における堆積盆地の発生・発展と変質・変成作用

概要

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The tectonic movement and sedimentation of the Green Tuff geosyncline can be summarized as follows: 1. At first, a depression structure fringed with a normal fault was formed after the upheaval of the basement. This was succeeded by the vigorous volcanism of andesite or dacite. 2. The sedimentary basins, which were generated through the above process, were shifted into certain directions with repeated subsidence and sendimentation, and the "Shogi-daoshi structure" (laterally shifting, on lapped deposition) was formed. 3. The generation of the depression structure and the development of the sedimentary basins occurred successively three to four times through the Miocene epoch. 4. The alteration of the pyroclastic rocks in the Green Tuff region can be regarded as a kind of regional metamorphism in a broad sense. The altered or metamorphosed rocks are generally classified into propylite, green coloured tuff, and zeolite bearing rock without green colour, which roughly occur stratigraphically in a scending order. The alteration or metamorphism in the sedimentary basins of the Green Tuff region took place at three or four stages, which are correlated to the above tectonical and sedimentary stages. The regionally altered or metamorphosed rocks are modified by the thermal or hydrothermal effect of igneous rocks, such as quartz diorite and rhyolite.
日本地質学会の論文
1968-07-31