日高変成帯, 静内川地域に産する十字石 Staurolite occurrences in the Shizunai river area in the Hidaka metamorphic belt, Hokkaido, Japan

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A new staurolite locality in the Hidaka metamorphic belt (HMB) is reported. Staurolite occurs as inclusions in garnet and plagioclase in alternating garnet-cordierite and garnet-cordierite-gedrite gneisses in the Shizunai river area, central part of the belt.<br>     Two types of staurolite-breakdown reactions, Staurolite+Chlorite+Quartz=Garnet+H<sub>2</sub>O and Staurolite+Gedrite (Na-, Al-poor)+Plagioclase (Ca-poor)=Gedrite (Na-, Al-rich)+Plagioclase (Ca-rich)+Quartz+H<sub>2</sub>O, are recognized. Subsequently, Gedrite (Na-rich)+Plagioclase (Ca-rich)+Quartz=Gedrite (Na-poor)+Plagioclase (Ca-poor) occurred.<br>     Estimated H content of the staurolite is low (2.2-3.2), suggesting low pressure type. Those from the both Menashunbetsu river and Hidakahorobetsu river areas, locating in the south of the Shizunai river area, show similar values.<br>     Fe-Mg partitioning coefficients between included staurolite and host garnet are plotted on and around the line of K<sub>D</sub> =1. Despite of large uncertainty (±60-70°C) of the Koch-Müller (1997)'s staurolite-garnet geothermometry, the application to the pair from the Shizunai river area shows a consistent result with other methods. The minimum temperature estimate for staurolite-garnet pairs is almost constant through the whole HMB. The closure temperature of the Fe-Mg exchange reaction between staurolite and garnet in the HMB is ca. 700°C.<br>     The similarities of H contents of staurolite and Fe/Mg distribution and re-equilibration processes of staurolite-garnet pairs may indicate that at least high-grade part of the central area of HMB has been suffered similar thermal histories at similar depths.

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  • 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 94(8), 267-278, 1999-08 

    Japan Association of Mineralogical Sciences

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各種コード

  • NII論文ID(NAID)
    10002603518
  • 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
    4853419
  • 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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