Journal article

On the dynamics of NaCl-H2O fluid convection in the Earth's crust

S Geiger, T Driesner, CA Heinrich, SK Matthai

JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH | AMER GEOPHYSICAL UNION | Published : 2005

Abstract

Numerical simulations of transient porous media thermohaline convection including phase separation into a high-density, high-salinity brine phase and a low-density, low-salinity vapor phase at pressures and temperatures well above the critical point of pure H2O are presented. Using a novel finite element-finite volume (FEFV) solution technique and a new equation of state for the binary NaC1-H2O system, convection of a NaCl-H2O fluid in an open top square box of 4 × 4 km is studied at geologically realistic pressure p, temperature T, and salinity X conditions. In the simulations, the basal temperature and salinity are varied systematically from 200 to 600°C and from 3.2 to 40 or 60 wt % NaCl,..

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