Albite–K-feldspar–quartz equilibria in hydrothermal fluids at 400, 420°C and 20–35 MPa: Experimental measurements and thermodynamic calculations

Atsushi Okamoto, Hajime Ishii, Ryosuke Oyanagi, Noriyoshi Tsuchiya

Research output: Contribution to journalArticlepeer-review

Abstract

Mineral–fluid equilibria in supercritical geothermal reservoirs is poorly understood, due to the non-applicability of the Helgeson–Kirkham–Flowers (HKF) electrostatic model for aqueous species in low-density regions. We experimentally investigated the dissolution equilibria of albite–K-feldspar–quartz in hydrothermal solutions at 400, 420 °C and 20–35 MPa, and compared the experimental results with thermodynamic calculations. The thermodynamics data based on the HKF model available through SUPCRT92 were extrapolated into the low-density regions with water density. Our results suggest that the extrapolated data are useful as a first approximation for evaluating feldspars–fluid equilibria under supercritical and low-density hydrothermal conditions.

Original languageEnglish
Article number102109
JournalGeothermics
Volume94
DOIs
Publication statusPublished - 2021 Jul

Keywords

  • Density model
  • Feldspar dissolution
  • Hydrothermal experiments
  • Supercritical fluids
  • Thermodynamic data

ASJC Scopus subject areas

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

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