飛騨外縁帯の再定義  [in Japanese] Redefinition of the Hida Gaien belt  [in Japanese]

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Abstract

従来, 飛騨外縁帯の分布・区分などには多くの混乱と問題があったため, その発達史を議論する上で大きな障害となっていた. 従来飛騨外縁帯として扱われてきた地層・岩体は, 岩相とその占める空間的位置により, (1) 中~上部古生界浅海成層を主体とする地層群 (宇奈月帯構成岩類を含む), (2) 300Ma以前の変成岩を含み, 苦鉄質~超苦鉄質岩を主体とするもの, (3) 後期古生代の石灰岩・チャート・砕屑岩主体層, (4) 苦鉄質岩とペルム系砕屑岩, の4つに大別される. 後三者は, それぞれ三郡—蓮華帯, 秋吉帯および舞鶴帯に帰属を求めることができ, 本論では (1) の分布域を飛騨外縁帯として再定義することを提案し, その模式地は福地・本郷・古川地域とする. 本論の飛騨外縁帯構成岩類は, 宇奈月, 白馬岳, 福地・本郷・古川, 〓谷, 石徹白, 朝日, 伊勢・大野の各地域に分布し, それらは各地域内で断層もしくは剪断帯で寸断されてブロック化している.

Since the 1950s, rocks of the Hida Gaien belt have been subdivided into four units: (1) Middle to Upper Paleozoic shallow marine formations (including their metamorphosed facies of the Unazuki belt); (2) mafic to ultramafic igneous rocks including high P/T metamorphic rocks older than 300 Ma; (3) Upper Paleozoic limestone, chert and clastic rocks; and (4) Permian mafic igneous rocks and clastic formations. In this subdivision, the units are identified by their major lithology and their tectonic position. Over the last two decades, detailed knowledge of the lithology, age and stratigraphic relationships of these rocks has increased to such an extent that units (2), (3) and (4) are today correlated with rocks not of the Hida Gaien belt, but of the Sangun-Renge, Akiyoshi and Maizuru belts respectively. In this paper, the remaining unit (1) is correlated with the newly revised Hida Gaien belt. Unit (1) rocks are distributed in the Unazuki, Shiroumadake, Fukuji-Hongo-Furukawa, Naradani, Itoshiro and Asahi-Ise-Ohno areas. The type locality is designated as the Fukuji-Hongo-Furukawa area.

Journal

  • The Journal of the Geological Society of Japan

    The Journal of the Geological Society of Japan 110(10), 640-658, 2004-10-15

    The Geological Society of Japan

References:  168

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Cited by:  7

Codes

  • NII Article ID (NAID)
    110003024813
  • NII NACSIS-CAT ID (NCID)
    AN00141768
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    00167630
  • NDL Article ID
    7133891
  • NDL Source Classification
    ZM49(科学技術--地球科学--地質)
  • NDL Call No.
    Z15-174
  • Data Source
    CJP  CJPref  NDL  NII-ELS  J-STAGE 
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