Albite?K-feldspar?quartz equilibria in hydrothermal fluids at 400, 420°C and 20?35 MPa: Experimental measurements and thermodynamic calculations
Albite?K-feldspar?quartz equilibria in hydrothermal fluids at 400, 420°C and 20?35 MPa: Experimental measurements and thermodynamic calculations
复制标题
400、420°C 和 20-35 MPa 热液中钠长石·钾长石·石英平衡：实验测量和热力学计算
DOI：
10.1016/j.geothermics.2021.102109
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发表时间：
2021
期刊：
影响因子：
3.9
通讯作者：
Tsuchiya Noriyoshi
中科院分区：
文献类型：
--
作者：
Okamoto Atsushi;Ishii Hajime;Oyanagi Ryosuke;Tsuchiya Noriyoshi
超临界地热储层中的矿物流体平衡知之甚少，由于Helgeson-Kirkham-Flowers（HKF）静电模型不适用于低密度区域的含水物种。实验研究了钠长石-钾长石-石英在400、420 °C和20-35 MPa热液中的溶解平衡，并与热力学计算结果进行了比较。利用SUPCRT 92提供的基于HKF模型的热力学数据外推到水密度低的区域。我们的研究结果表明，外推的数据是有用的第一近似评估超临界和低密度热液条件下的菱镁矿流体平衡。
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.