Hypogene Alunite from Acid Alteration Zone in Hatchobaru Geothermal Field, Kyushu, Japan

Junko Kiyosaki, Kana Tanaka, Sachihiro Taguchi, Hitoshi Chiba, Koichi Takeuchi, Yoshinobu Motomura

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Alteration minerals focused on alunite and other acid alteration minerals were examined in the northern part of the Hatchobaru geothermal field. Alunite minerals are widely distributed with more than 300 meters thickness. Alunite minerals have a wide range of δ31S from 0.5 to 23.7 per mil, indicating several different origins: supergene and hypogene origins. APS (Aluminium phosphate-sulfate) minerals in the core of the alunite minerals and the newly found acid alteration minerals such as zunyite, topaz, and andalusite suggest that volcanic acid sulfate solutions were once present to have formed the thick acid alteration zone at the Hatchobaru geothermal field.

Original languageEnglish
Pages (from-to)287-297
Number of pages11
JournalJournal of the Geothermal Research Society of Japan
Issue number3
Publication statusPublished - 2006



  • alunite
  • geothermal
  • Hatchobaru
  • hypogene origin
  • Japan
  • sulfur isotope

ASJC Scopus subject areas

  • Geophysics

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