TY - JOUR
T1 - Albite–K-feldspar–quartz equilibria in hydrothermal fluids at 400, 420°C and 20–35 MPa
T2 - Experimental measurements and thermodynamic calculations
AU - Okamoto, Atsushi
AU - Ishii, Hajime
AU - Oyanagi, Ryosuke
AU - Tsuchiya, Noriyoshi
N1 - Funding Information:
We thank Yusuke Netsu, Takamasa Niibe, and Shinichi Yamasaki for help with the solution analyses, and Kazuki Yoshida for processing the thermodynamic data. Discussions with Kenichi Hoshino, Hiroshi Sakuma, Daisuke Fukuda, and Norihiro Watanabe regarding the thermodynamic data for aqueous species were valuable. We thank three anonymous reviewers for their constructive comments. This research was financially supported by a Grant-in-Aid for Scientific Research (JP16H06347, 18KK0376 to A.O.) and a Grant-in-Aid for Specially Promoted Research (JP25000009 to N.T.). This paper is partly based on results obtained from a project commissioned by the New Energy and Industrial Technology Development Organization (NEDO).
Funding Information:
We thank Yusuke Netsu, Takamasa Niibe, and Shinichi Yamasaki for help with the solution analyses, and Kazuki Yoshida for processing the thermodynamic data. Discussions with Kenichi Hoshino, Hiroshi Sakuma, Daisuke Fukuda, and Norihiro Watanabe regarding the thermodynamic data for aqueous species were valuable. We thank three anonymous reviewers for their constructive comments. This research was financially supported by a Grant-in-Aid for Scientific Research (JP16H06347, 18KK0376 to A.O.) and a Grant-in-Aid for Specially Promoted Research (JP25000009 to N.T.). This paper is partly based on results obtained from a project commissioned by the New Energy and Industrial Technology Development Organization (NEDO).
Publisher Copyright:
© 2021
PY - 2021/7
Y1 - 2021/7
N2 - 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.
AB - 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.
KW - Density model
KW - Feldspar dissolution
KW - Hydrothermal experiments
KW - Supercritical fluids
KW - Thermodynamic data
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U2 - 10.1016/j.geothermics.2021.102109
DO - 10.1016/j.geothermics.2021.102109
M3 - Article
AN - SCOPUS:85103949231
SN - 0375-6505
VL - 94
JO - Geothermics
JF - Geothermics
M1 - 102109
ER -
