On the ig ?? eöus äctivities in Kuzumaru and Toyosawa region, Iwate Prefecture

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Bibliographic Information

Other Title
  • 岩手縣葛丸川及び豐澤川上流地方に於ける火成活動に就いて

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Description

In the same way as in Kakkonda region, already reported, in Kuzumaru and Toyosawa region dacite activities are observed as the first products of the igneous activities extruded out in the depression lake on the “Oshuku-Iwasawa Tectonic Line” which extend from north to south along the eastern marginal region of tha “Ou-Mountainland” The dacite activities are divided in five stages having the time of repose between them. The products of every stages consist of lava, agglomerate, agglomeratic-tuff, pumiceous-tuff and detritus, having a tendency of decreasing their acidity as passing to later stage. In every time of repose, alternation of tuffaceous sandstone or sand and gravel are sedimented. Especially, in the time of repose between the fourth and fifth stags, some depression calderas of small scale are formed, in which sulphur deposits of peculiar tyhe are observed.

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Details 詳細情報について

  • CRID
    1390282681193485312
  • NII Article ID
    130003883674
  • DOI
    10.2465/ganko1941.36.135
  • ISSN
    18830765
    00214825
  • Data Source
    • JaLC
    • Crossref
    • CiNii Articles
  • Abstract License Flag
    Disallowed

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