Three Major Orogenetic Movements in Japanese Islands, with Special Remarks on Granite Conglomerates of Molasse Type

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  • MINATO Masao
    地学団体研究会札幌支部:北海道大学理学部地質学鉱物学教室

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  • 花崗礫岩からみた日本の3つの造山運動
  • カコウレキガン カラ ミタ ニホン ノ ミッツ ノ ゾウザン ウンドウ

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That orogenetic movements corresponding to the Alps and Variscan held in Japanese islands is doubtless. The former has been called under the name of Hidaka orogenesis, while for the latter, the name of Abean orogenetic movement is newly proposed.In this paper, it is briefly presented how those mountains in those days became to high and were eroded away from the cores and how those erosional products were deposited in front. Those deposits always contain a large amount of granitic pebbles and show to be typical molasse type of conglomerates. It is uncertain about the orogenesis held prior to the Variscan movements in Japanese islands, but the presence of granite conglomerates in the Upper Devonian Tobigamori series with Cyrtospirifer and Sinospirifer fauna, is worthy of note. From the various reasons, either from the view points of volcanic activities held in Japan during the time ranging from the Silurian to Early Devonian, or probable existence of hiatus in the preUpper Middle Devonian and Upper Devonian in North Japan, I am now inclined to believe the possibility that some type of orogenic movement corresponding to Caledonian was surely held in Japan.

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