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The Cretaceous Mikasa Formation is typically exposed in the Ikushumbets area, central Hokkaido, which is one of the type areas of the Cretaceous System in Japan. This paper contains the results of the... petrological study of the sandstone of the Mikasa Formation. Two types of sandstone, graywackes and subgraywackes, are developed in harmony with a number of geological facts. On each rock type textural and mineralogical features have been examined, and its depositional conditions are discussed. Further comments are extended to some characteristics of heavy minerals. Comparison of the Mikasa Formation with that of other related stratigraphic units are also described. Detritus of the sediments came mainly from western uplands, where source rocks were chiefly composed of older sedimentaries and subordinately of acid to ultrabasic igneous rocks.続きを見る
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Ⅰ.Introduction Ⅱ.Acknowledgements Ⅲ.Geologic Setting Ⅳ.Petrology Ⅴ.Concluding Remarks
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Mendeley出力
16_01_p081