Magmatic fluid input to the Kuju-Iwoyama hydrothermal system prior to the 1995 eruption of the Kuju volcano (Kyushu, Japan)

Itsuro Kita, Tatsuji Kai, Ryuichi Itoi, Makiko Ishida, Akira Ueda

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

A schematic model showing the sources of hot waters being discharged at the surface in the Kuju-Iwoyama of the Kuju volcano has been developed. Based on the isotopic characteristics of these fluids it is inferred that deep magmatic fluid mixes with thermal waters derived from rainwater in a shallow geothermal reservoir, and with local groundwaters in a deeper reservoir. These thermal waters feed hot springs that discharge waters with Cl/SO4 ratios that differ from that of the fumaroles on Kuju-Iwoyama, due to the addition of SO42- ions produced by the decomposition of native sulfur and mixing with magmatic fluid of high Cl content.

Original languageEnglish
Pages (from-to)294-302
Number of pages9
JournalGeothermics
Volume38
Issue number3
DOIs
Publication statusPublished - Sep 1 2009

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Geotechnical Engineering and Engineering Geology
  • Geology

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