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- W1969200021 abstract "From a palaeomagnetic study and radiometric investigation of Cretaceous intrusive rocks it was recently suggested that the Palaeozoic basin formed in the northeastern Japan was severely deformed at the end of Mesozoic era. This resulted in a narrowing and shortening of the entire length of the Japanese islands. The northeastern block moved southwestward by approximately 200km and southwestern northeastward by 150km, whereas the middle block remained relatively unmoved but was compressed between the two blocks. As the compressional forces increased, first the Palaeozoic sediments of the central block were uplifted, and subsequently the “median line” was formed. Along the latter line, the northern half of the southern block moved eastward relative to the southern half. A strong uniaxial stress superimposed upon a hydrostatic one occurred associated with the relative movement. The sediments as the results recrystallized to form the three major metamorphic belts.During and after these movements, the compressed zone in the middle of the island was pushed to the east to form a great warp in the island. Such a simple model of a bend accompanied by a tension crack as predicted by Kawai, Ito and Kume several years ago was reconsidered. The contraction of the basin was finally related to the eastward drift of Asian continent upon the Cretaceous Pacific sea floor. The drift of the continents around the Pacific resulted in the narrowing of the ocean as well as the shortening of the coastal line. That of the Japanese islands is a part of the shortening that occurred around the Pacific zone.We suggest that the heat of friction was accumulated at the deep-seismic plane (Benioff zone) at which the down and west going ocean floor and the up-thrusting mantle have been conflicting. The mantle nearby the deep-seismic plane was, therefore, warmed up until it partially melted. An acidic and migmatitic magma initiated at the friction interface was intruded into the pre-existing fracture zone occupying the front. Production of frictional heat was, we believe, succeeded even in the Tertiary period when effective drift was no longer evident but the retardation of the motion of the continent was much stronger. Heat required to cause the Tertiary volcanic activity might be due to this friction." @default.
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- W1969200021 date "1971-01-01" @default.
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- W1969200021 title "The Evolution of the Island Arc of Japan and the Formation of Granites in the Circum-Pacific Belt" @default.
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- W1969200021 doi "https://doi.org/10.5636/jgg.23.267" @default.
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