能登半島の憐鑛々床について : 堆積源鑛床の形成過程の研究 I
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概要
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There are some noted phosphorite beds contained in the Tertiary formations distributed widely in Noto Peninsula., These beds belong to two different geological units ; one is the Noto series (F 2-F 3), and the other is the Nanao series (F 3-G)., The process of formation of the phosphorite deposits is to be considered as the process of diagenesis of the sedimentary rock in general., The process of deposition of the mother rock and the process of diagenesis of the particular part of the rock are to be distinguished clearly from each other., On the studies of the process of deposition of the unaltered mother rock of the phosphorite beds of above mentioned district, it is found that the phosphorite beds were deposited as the calcareous part in those strata., From the observations of the relation between the phosphorite beds and the surrouding rocks, it is ascertained that the phosphatization was taken on after the desposition of the stratum had completed., The calcareous sediments were weathered by the phosphoric acid contained in the circulating water rich in organic contents, and the loss of CaO and the enrichment of P were resulted., The source of phosphorus offerred to the calcareous sediments is most appropriately attributed to the colloidal organic substance covering the sea bottom under the peculiar condition, such as logoon, coastal region, etc., The difference between the rock facies in the stratum causes the different reactions respectively for the circulating water rich in organic contents., The phosphorus has been enriched in the calcareous rocks surrounded by the non-calcareous ones, and thus the phoshorite bed has been resulted., The environment and process of phosphatization are to be considered as indifferent ones to the environment and process of deposition, but the composition of rock, both chemical and physical, that is the resultant products of the deposition, has the main roll in the process of phosphatization, in the intimate relation with the condition in which the stratum is laid after the deposition.,
- 日本地質学会の論文
- 1950-08-05