Chikyukagaku
Online ISSN : 2188-5923
Print ISSN : 0386-4073
ISSN-L : 0386-4073
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Volume 4, Issue 1
Displaying 1-4 of 4 articles from this issue
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Original Paper
  • The relationship between chemical composition of titanomagnetite and colored minerals coexisting with it in Kanto and Shinshu loams
    Ryuji AOYAGI
    1970 Volume 4 Issue 1 Pages 1-11
    Published: 1970
    Released on J-STAGE: November 03, 2016
    DOIhttps://doi.org/10.14934/chikyukagaku.4.1
    JOURNAL FREE ACCESS
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    For the purpose of contributing to tephrochronology and clarifying the mechanism of their volcanic effusion, the relationship between chemical composition of titanomagnetite and coexisting colored minerals (olivine, pyroxene, hornblende, and biotite) in the volcanic ashes and fall pumices was studied for selected samples from many horizons widely distributed in Kanto and Shinshu districts in central Japan. In the case of fall pumices, the TiO2 content of titanomagnetite gradually decreases from basic fall pumice (olivine-bearing) to acidic one (hornblende-bearing), and it seems to be pos- sible to deduce the properties of rocks at the time of eruption on the basis of the TiO2 content of titanomagnetite even in the horizons which were significantly weathered and lost colored minerals. On the other hand, the TiO2 content of titanomagnetite in volcanic ashes has little reference to the colored minerals, and it seems to be difficult to estimate the properties of fresh ashes just after eruption.
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