@article{oai:ir.kagoshima-u.ac.jp:00013073,
 author = {松井, 智彰},
 journal = {鹿児島大学教育学部研究紀要. 自然科学編, Bulletin of the Faculty of Education, Kagoshima University. Natural science},
 month = {2016-10-31},
 note = {A peculiar type of layered calcareous concretions occurs at the Somachi Formation which is unconformably overlain by Ryukyu limestone in Kikai-jima, Kagoshima Prefecture, Japan. The concretions are not oriented parallel to the bedding plane, and have the internal structure of at most 7 layers which are symmetrically arranged. Powder X-ray diffraction analyses revealed that the concretions consist mainly of calcite with quartz and minor amount of dolomite. Compositional mappings by X-ray analytical microscope show slightly negative correlation between Ca and Si, that is calcite and quartz. Weak concentration of Fe is shown around the central 3 layers in the concretion. Distributions of the other elements do not correspond to the internal layered structure significantly. These mineralogical characteristics and the occurrence of the layered calcareous concretions seem to help more understanding to the geological history of Kikai-jima.},
 pages = {35--42},
 title = {鹿児島県喜界島産層状石灰質コンクリーション},
 volume = {64},
 year = {}
}