Comparison of the Middle Jurassic to earliest Cretaceous sandstones from the Japanese Islands and South Sikhote-Alin(<Special issue>Geotectonic framework of eastern Asia before the opening of the Japan Sea-Part 2-)

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  • 日本列島及びシホテアリン南部におけるジュラ紀中期～白亜紀最前期の砂岩の比較(<特集>日本海拡大前の東アジアの地体構造-その2-)
  • Comparison of the Middle Jurassic to earliest Cretaceous sandstones from the Japanese Islands and South Sikhote-Alin

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The authors examined and reviewed the sandstone composition of the late Middle Jurassic to the earliest Cretaceous in the Far East. Accretionary complex sandstones in Japan and in south Sikhote-Alin are divided into two units respectively. Brackish and shallow-marine sandstones in Japan mainly are divided into two floral regions. Using published data examined mostly by the traditional point-counting counting method, Q-F-R and Q-P-K diagrams of the traditional method were superposed on to Qm-F-Lt and Qm-P-K diagrams of the Gazzi-Dickinson point-counting method. As it turned out, tectonic provenance of sandstone assigned by geochemical data is consistent with that expected from its modal composition. Accretionary complex sandstone of this age in Japan is quartz-feldspathic sandstone as a whole. Sandstone of the Inner Zone is a little quartzose and sandstone of the Outer Zone is more feldspathic, although the difference of composition is not so distinctive. As for the brackish to shallow-marine sandstones in Japan, the sandstone from the South Kitakami and Abukuma belts (SKA) is quartzose, and that from the Tetori Group in the Hida and Hida Marginal belts (HHM) is feldspathic. The compositional features of the former are similar to those of the Inner Zone, and those of the later are similar to those of the Outer Zone. Tectonic provenance of the HHM is continental margin, but it might be more active than the source land of the other units.

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