西南日本およびその周辺地区における後期中生代火成活動の性格(討論会-日本列島の中生代変動の性格,<特集>20回記念総会「中生代変動」討論会)

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The writer briefly discussed, from a viewpoint of volcanism, the nature of the late Mesozoic igneous activities in Southwest Japan and its neighbourhood. It is said that the activities are genetically related to the Yenshan movements of the East Asiatic continent, although the former is a little younger in age than the latter. In the Inner Zone of Southwest Japan, the igneous activities were not immediately preceded by a marine geosynclinal stage, but by terrestrial conditions in general. They are characterized by extensive volcanism on land surface and plutonism followed it. It is most worthy of note that the rhyolite welded tuffs occupy the most parts of the Cretaceous volcanic rocks and they are now exposed as several gigantic masses in the Zone. Granitic rocks of batholithic dimension were intruded, not only into the Paleozoic strata and their metamorphic equivalents, but also into the preceding volcanic rocks overlying these strata, affecting them thermal influences. In this paper, the writer distinguished three provinces of Cretaceous volcanism in Southwest Japan, namely Chugoku, Chubu and North Kantd provinces, and shortly described the mode of occurrences of volcanic rocks, age of eruption, their lithological characters and their associated intrusive facies in each province. Lastly he refered to some problems of the Ryoke plutono-metamorphism in connection with the abovementioned igneous activities, and made clear, contrary to hitherto prevailing opinions, that the main phase of this plutono-metamorphism is younger than the eruption of the Nohi rhyolites of probably late Cretaceous age.
地学団体研究会の論文
1966-09-25

西南日本およびその周辺地区における後期中生代火成活動の性格(討論会-日本列島の中生代変動の性格,<特集>20回記念総会「中生代変動」討論会)

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