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Goshonoura Island, off the west coast of the main island of Kyushu is the type area of the Goshonoura group, which is mainly composed of sandstones. The overlying Himenoura group has also some sandsto...nes. This paper contains the results of the petrographical study of these Cretaceous sandstones. In the Goshonoura group, basal arkose, lower to middle feldspathic graywacke, and upper lithic graywacke are in regular sequence in ascending order, as are the arkose and feldspathic suites in the overlying Himenoura. The mineral constituents likewise show a serial change. On the basis of the assemblage of minerals, seven zones are discriminated in the former and two in the latter. Relationship between the Goshonoura and Himenoura groups is discussed from petrographical and mineralogical points, with a suggestion that there should be a significant gap between them. The graywacke suite of the Goshonoura group is rather unique in character like that of the contemporaneous Mifuné group. Genetic significance is commented on the graywacke suite as well as arkose suite. Further comments are given on the regional paleotectonics which controled the Goshonoura and Mifuné groups. The term molasse facies cannot be adequately referred to these deposits.続きを見る
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Ⅰ.Introductory Remarks Ⅱ.Petrographic Descriptions Ⅲ.Petrographic Remarks Ⅳ.Concluding Remarks 5.References Cited 6.Appendix
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Mendeley出力
11_01_p001