Mineral–fluid equilibria in supercritical geothermal reservoirs is poorly understood, due to the non-applicability of Helgeson–Kirkham–Flowers (HKF) electrostatic model for aqueous species low-density regions. We experimentally investigated dissolution albite–K-feldspar–quartz hydrothermal solutions at 400, 420 °C and 20–35 MPa, compared experimental results with thermodynamic calculations. The...

Introduction: The study of terrestrial analogs to Martian igneous rock compositions and surface features is important in order to gain insight into past and present dynamic processes experienced on Mars. Previous Martian analog studies have been performed on materials from various terrestrial environments [e.g., 1-3]. For this study, we investigated petrological and mineralogical properties of ...

In experiments at 600°C in the system NaCI-KCI-H20, within the analytical uncertainty, stoichiometric quantities of C1 and total alkali metals (Na+K) appear to dissolve in steam coexisting with chloride-rich brine at high pressures in the absence of solid salt. In contrast, at lower pressures, where steam coexists with precipitated salts, significant excess chloride as associated hydrogen chlor...

Abstract —Feldspar group minerals (feldspars) form up to 60 vol.% of the Earth’s crust. The knowledge their stability under extreme conditions (high-pressure and high-temperature) allow better understand processes, that occur in subduction collision processes. This review focuses on behavior feldspars with paracelsian topology (seven mineral species: three borosilicates, two aluminosilicates be...