Simulation test of granite alteration in HDR reservoir using flow system autoclave

N. Yamasaki, Y. Wang, K. Yanagisawa, Q. Feng, S. Nishiuchi, T. Ishida, N. Tsuchiya, K. Nakatsuka, H. Takahashi, K. Hayashi

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


A tube reactor autoclave equipped with pH meter with a temperature gradient for considering the flow system in multi cracks of hot dry or wet rock has been developed. The results using this simulation test showed a maximum dissolution regions at the temperature between 250-320°C and the deposition regions above 330°C. The dramatic change from dissolution to deposition occurred at 330°C. These results were supported by the apparent solubility of granite and silica. The dissolution-deposition under the flow system was mainly proceeded by alteration of feldspar around 200°C, and quartz above 300°C. The deposition mineral was low quatz at the place above 330°C with flow direction from low to high temperature, however, cristobaite from high to low temperature. The alteration of feldspar in granite is easily occurred around at 200°C to form zeolite and clay minerals. Mica in granite is most stable mineral and the alteration could not be observed besides deposit minerals on the surface.

Original languageEnglish
Pages (from-to)299-314
Number of pages16
JournalGeothermal Science and Technology
Issue number1-4
Publication statusPublished - 1999


  • Alteration
  • Flow system autoclave
  • Granite
  • HDR
  • Hydrothermal

ASJC Scopus subject areas

  • Water Science and Technology
  • Ocean Engineering
  • Management of Technology and Innovation


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