Granitic rocks in northern Kyushu.
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概要
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From the mode of occurrence and the chemical and mineralogical composition of granitic rocks, three granite provinces, designated, East, Central, and West zones are recognized in northern Kyushu. These zones are separated by the Kokura-Tagawa and Hakata-Futsukaichi tectonic lines, respectively.<BR>Although most granitic rocks in the East zone belong to the ilmenite-series, the granitic rocks in the Central and West zones belong mostly to the magnetite-series and partly to the ilmenite-series.<BR>Recognition of the importance of chlorine complexing in enhancing the solubility of metal sulfides in aqueous solution had led to the view that the chlorine content of intrusive rocks could govern the ability of a magma to separate a metal-rich hydrothermal phase. Relatively high chlorine contents were obtained for apatites, biotites, and amphiboles from the Central zone granitic rocks, low chlorine contents were obtained for the same minerals from the West zone granitic rocks, and the minerals from the East zone granitic rocks are essentially chlorine-free.<BR>From the structure and texture of the granitic rocks and from the chemistry of the granitic rocks, it is suggested that the East and Central zone granitic rocks are high level intrusions compared to the West zone granitic rocks.<BR>If hydrothermal transport of base metals in chloride complexes is accepted, it is suggested that most of hydrothermal base metal deposits in northern Kyushu were associated with the Central zone granitic magmas. The presence of contact metasomatic copper deposits in the Yoshiwara mining district supports the conclusion just mentioned.
- 資源地質学会の論文
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