伊香保温泉から析出したノントロナイト  [in Japanese] Nontronite deposited from Ikaho hot-spring waters  [in Japanese]

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Abstract

The occurrence of nontronite as hot-spring deposit is first described from Ikaho Hot-springs, Gunma Prefecture, Japan. The hot-spring water, issuing from the No. 6 drilled well (Temp.=65.9℃, pH=6.65) is introduced into a concrete tank, where yellow-green deposit is precipitating with a rate of 1cm /year. The deposit has been identified as nontronite by chemical analysis, thermal analyses (DTA and TG), infrared spectra, and X-ray diffractometry. A typical nontronite sample (No. 6-1-G), with a composition of {Na<sub>0.02</sub>K<sub>0.01</sub>Ca<sub>0.10</sub>} (Fe<sup>3+</sup><sub>1.45</sub>Mn<sub>0.02</sub>Mg<sub>0.08</sub>)[Si<sub>3.37</sub>Al<sub>0.13</sub>Fe<sup>3+</sup><sub>0.50</sub>]O<sub>10</sub>(OH)<sub>1.86</sub>. nH<sub>2</sub>O. has been revealed by scanning electron microscopy to be an aggregate of small particles with a diameter less than 1〜2μm, and by transmisson electron micrograph to be feathery. This sample is slightly higher in iron content than the idealized formula of nontronite. Moessbauer spectroscopy showed that Fe in the sample is mostly in trivalent state. The genetic condition of this mineral is also discussed.

Journal

  • Chikyukagaku

    Chikyukagaku 28(2), 113-122, 1994

    The Geochemical Society of Japan

Codes

  • NII Article ID (NAID)
    110008679893
  • NII NACSIS-CAT ID (NCID)
    AN00141280
  • Text Lang
    JPN
  • ISSN
    0386-4073
  • NDL Article ID
    3889315
  • 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
    NDL  NII-ELS  J-STAGE 
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