鬼首地域における地熱流体の起源  [in Japanese] Origin of geothermal fluid in the Onikobe area  [in Japanese]

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Abstract

Chemical and isotopic compositions have been determined for steam and water samples from fumaroles, hot springs and wells in the Onikobe geothermal field. The thermal waters are grouped into acid sulfate type, acid sulfate-chloride type and NaCl type waters. The stable isotopic data indicate that the reservoir fluids extremely enriched in <sup>18</sup>O are meteoric in origin and that the NaCl type hot spring waters are mixtures of these fluids and meteoric waters. The acid sulfate type waters are formed in shallow aquifer with oxidation of fumarolic hydrogen sulfide. The sulfate enriched in <sup>34</sup>S from acid sulfate-chloride and NaCl type waters originate in the disproportionation of volcanic sulfur dioxide. δ<sup>13</sup>C<sub>CO<sub>2</sub></sub> value suggests that a carbon source for C0<sub>2</sub> in steam and waters at Onikobe is related to volcanic activity. The gas ratio such as CO<sub>2</sub>/N<sub>2</sub>, N<sub>2</sub>/Ar and He/Ar indicates that the Onikobe geothermal fluid is a mixture of volcanic gases and groundwaters and that these gases are dissolved in liquid reservoir fluids at near reservoir temperature.

Journal

  • Chikyukagaku

    Chikyukagaku 20(2), 59-68, 1987

    The Geochemical Society of Japan

Cited by:  3

Codes

  • NII Article ID (NAID)
    110008679783
  • NII NACSIS-CAT ID (NCID)
    AN00141280
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    0386-4073
  • NDL Article ID
    3115027
  • NDL Source Classification
    ME34(水文学--陸水)
  • NDL Source Classification
    ZM41(科学技術--地球科学)
  • NDL Call No.
    Z15-645
  • Data Source
    CJPref  NDL  NII-ELS  J-STAGE 
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