西南北海道,上ノ国地帯のジュラ紀付加体

DOI
  • 石賀 裕明
    Department of Geology, Faculty of Science, Shimane University
  • 石山 大三
    Institute of Mining Geology, Mining College, Akita University

書誌事項

タイトル別名
  • Jurassic Accretionary Complex in Kaminokuni Terrane, Southwestern Hokkaido, Japan

抄録

The geologic unit comprising the Jurassic accretionary complex in the Kaminokuni area in the Southwestern Hokkaido is newly defined as the Kaminokuni Terrane. It is composed of the Matsumae Group which is characterized by overlying and underlying tectonic units forming the two-storied structure. The Matsumae Group of the overlying unit (unit 2) consists of the a, b and c formations in ascending order, while the underlying unit (unit 1) is composed mainly of the b formation. These three formations are tectonically repeated within both units.<BR>The a formation is composed of the oceanic greenstone and bedded chert of Late Carboniferous through Permian age and the lower part of bedded chert includes bedded manganiferous iron oxide and manganese ore deposits, in ascending order. The nature and age of formation of these deposits are camparable to those of the Outer Zone of Southwest Japan but are dissimilar to those of the Inner Zone. The b formation consists of Middle to early Late Jurassic mudstone including olistoliths of Permian greenstone, bedded chert reworked from the a formation, and Triassic to Early Jurassic bedded cherts derived from the strata of the neighboring Kamiiso or Toi-Esan Terrane. The c formation is composed mainly of early Late Jurassic sandstone of which the provenance is regarded to be the continent or island arc.<BR>The two-storied structure of the Kaminokuni Terrane was formed during the underplating through the duplex accretion to the South Kitakami massif in post Late Jurassic time.

収録刊行物

  • 鉱山地質

    鉱山地質 37 (206), 381-394, 1987

    資源地質学会

詳細情報 詳細情報について

  • CRID
    1390282681503272320
  • NII論文ID
    130003639735
  • DOI
    10.11456/shigenchishitsu1951.37.381
  • ISSN
    00265209
  • データソース種別
    • JaLC
    • CiNii Articles
  • 抄録ライセンスフラグ
    使用不可

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