北海道北部の中新世火山活動の活動場 : K-Ar年代と主成分化学組成からの推定 Tectonic setting of the Miocene volcanism in northern Hokkaido, Japan : Speculation from their K-Ar ages and major element chemistry

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Northern Hokkaido is situated in the back arc region behind the arc-arc junction of the Kurile and Northeast Japan arc. The district is unique because it is located between two back-arc basins, Kurile and Japan basins. Tertiary small-scale shield-like volcanoes (flat lavas) and volcaniclastic formations are widely distributed in this district. 9 K-Ar ages and 148 major element chemistries for these volcanic rocks were determined to clarify their petrological features and tectonic evolution of this district.<br>     The newly determined and previously reported K-Ar ages indicate that the vigorous volcanic activity took place during a short period from 14 to 9 Ma in the district. Total volume of the volcanic rocks is more than 650 km<sup>3</sup>. The volume of the volcanic rocks decreases from east (Sea of Okhotsk side) to west (Japan Sea side), suggesting that the volcanism took place mainly in eastern to central part. Most of the volcanic rocks are calc-alkaline and low-K to medium-K tholeiitic andesites, common in island arc setting. However, high TiO<sub>2</sub> andesites and icelandite-like dacites also occur along the Sea of Okhotsk. In addition, the volcanic rocks in northern Hokkaido show no systematic across-arc lateral variation in K<sub>2</sub>O content.<br>     The spatial variation in the chemical composition suggests that the Tertiary volcanism in northern Hokkaido was not caused by subduction of the Pacific plate. We presume that the volcanism was due to the episodic uprising of heat source (asthenospheric mantle?) which should be related to the opening of the Kurile basin.

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 90(4), 109-123, 1995-04-05 

    Japan Association of Mineralogical Sciences

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各種コード

  • NII論文ID(NAID)
    10002029084
  • 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
    3610367
  • NDL 刊行物分類
    ME41;ME61
  • 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 
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