愛媛県砥部町における万年安山岩体周辺の地質および熱水変質作用

概要

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Geology and hydrothermal alteration of the Mannen altered andesite in Tobe Town, Ehime Prefecture, Japan, has been investigated based on field survey and petrography. The Mannen andesite intrudes into the Sanbagawa metamorphic rocks and the Middle Miocene Kuma group after the formation of breccia including only clasts of the Sanbagawa basic schist. The Mannen andesite body have undergone extensive hydrothermal alteration and mineralization. The alteration is characterized by the occurrences of quartz, illite, kaolinite, carbonates, chlorite, anaterze, pyrite, arsenopyrite, marcasite, stibnite and chalcopyrite. The texture of sulfide minerals can be divided into five types, sparse, sand, spot, vein and pool, black-ink-drawing types on the basis of the mode of occurrences of sulfide minerals.
愛媛大学の論文
2005-03-25