南部北上帯西縁部の先デボン紀正法寺閃緑岩 -その岩石学とK-Ar年代- Pre-Devonian Shoboji Diorite distributed in the western border of the South Kitakami Belt : Its bearing on the characteristics of petrology and K-Ar age

この論文にアクセスする

この論文をさがす

著者

抄録

The Shoboji Diorite distributes sporadically in the southernmost area of the Motai Metamorphic Rocks. Constituting mafic minerals are composed of clinopyroxene, hornblende and small amount of biotite. The Diorite is massive and heterogeneous, and comprising mainly diorite with subordinate gabbro, tonalite and gabbroic cumulate. Field evidences indicate that the age of the Diorite is post-Motai Metamorphic Rocks and pre-Tobigamori Formation (Upper Devonian). The K-Ar ages of hornblende have the narrow range from 446 to 432 Ma with one exception. The ages are slightly younger than those of the banded amphibolites of the Matsugataira-Motai Metamorphic rocks and the mafic to ultramafic rocks of the Hayachine Complex. The hornblende K-Ar ages indicate that the Diorite belongs to the igneous activities of the Late Ordovician to the boundary of Ordovician-Silurian age. Tonalitic rocks exposed along the Isawa-gawa River at the foot of Mt. Yakeishi-dake in the Ou Mountains, and the Hikami granite in the Ofunato district, may also belong to the products of the same igneous activity. These igneous activities at the Late Ordovician characterize that of the subduction tectonics, and the same igneous activities had continued to Siluro-Devonian and Carboniferous. Further, the characteristics of these activities suggest that the South Kitakami Belt at that time had situated in the island arc or active continental margin along the Yangtze massif in northern border of the Gondwanaland.

収録刊行物

  • 岩鉱 : 岩石鉱物鉱床学会誌 : journal of mineralogy, petrology and economic geology  

    岩鉱 : 岩石鉱物鉱床学会誌 : journal of mineralogy, petrology and economic geology 92(5), 195-204, 1997-05-05 

    Japan Association of Mineralogical Sciences

参考文献:  27件

参考文献を見るにはログインが必要です。ユーザIDをお持ちでない方は新規登録してください。

被引用文献:  1件

被引用文献を見るにはログインが必要です。ユーザIDをお持ちでない方は新規登録してください。

各種コード

  • NII論文ID(NAID)
    10002088880
  • NII書誌ID(NCID)
    AN10047992
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    09149783
  • NDL 記事登録ID
    4265977
  • NDL 雑誌分類
    ZM46(科学技術--地球科学--岩石・鉱物・鉱床)
  • NDL 請求記号
    Z15-71
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
ページトップへ