Relationship between solidification depth of granitic rocks and formation of hydrothermal ore deposits

Etsuo Uchida, Sho Endo, Mitsutoshi Makino

    Research output: Contribution to journalArticle

    97 Citations (Scopus)

    Abstract

    Chemical analysis of biotite in representative granitic rocks in Japan shows that the total Al (TAl) content changes with the metal type of the accompanying hydrothermal ore deposits and increases in the following order: Pb-Zn and Mo deposits < Cu-Fe and Sn deposits < W deposits < non-mineralized granitic rocks. The TAl content of biotite in granitic rocks may be a useful indicator for distinguishing between mineralized and non-mineralized granitic rocks. A good positive correlation is seen between the T Al content of biotite and the solidification pressure of the granitic rocks estimated by sphalerite and hornblende geobarometers and the mineral assemblages of the surrounding rocks. These facts suggest that the TAl content of biotite can be used to estimate the solidification pressure (P) of the granitic rocks. The following empirical equation was obtained: P (kb) = 3.03 × TAl - 6.53 (± 0.33) where TAl designates the total Al content in biotite on the basis O = 22. According to the obtained biotite geobarometer, it is estimated that Pb-Zn and Mo deposits were formed at pressures below 1 kb, Cu-Fe and Sn deposits at 1-2 kb, W deposits at 2-3 kb and non-mineralized granitic rocks were solidified at pressures above 3 kb.

    Original languageEnglish
    Pages (from-to)47-56
    Number of pages10
    JournalResource Geology
    Volume57
    Issue number1
    DOIs
    Publication statusPublished - 2007 Mar

    Fingerprint

    Ore deposits
    solidification
    ore deposit
    Solidification
    Rocks
    biotite
    Deposits
    rock
    sphalerite
    hornblende
    chemical analysis
    Minerals
    Metals
    metal
    mineral

    ASJC Scopus subject areas

    • Geology
    • Geochemistry and Petrology

    Cite this

    Relationship between solidification depth of granitic rocks and formation of hydrothermal ore deposits. / Uchida, Etsuo; Endo, Sho; Makino, Mitsutoshi.

    In: Resource Geology, Vol. 57, No. 1, 03.2007, p. 47-56.

    Research output: Contribution to journalArticle

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