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This paper deals with the heavy minerals observed in the sandstones from the Tertiary coalbearing formations and their basements in the northern Kyushu, with regard to amounts (per cent in weight), ki...nds, and frequencies. In view of heavy minerals, the sediments of each coal field have several characteristic assemblages and may be mostly divided into several “Heavy Mineral Zones”. In this paper, such “Heavy Mineral Zones” are commented for the geological sequence of each coal field, and the relationship between the stratigraphical zoning and the mineralogical one is also discussed. Further comment is made on the volcanisms inferred from tuffs and tuffites embedded often in the Paleogene.続きを見る
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Mendeley出力
11_03_p381