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Accueil du site → Doctorat → États-Unis → 1999 → Constraints on salinity-driven convection and associated potassium metasomatism in arid lacustrine basins

University of Nevada, Reno (1999)

Constraints on salinity-driven convection and associated potassium metasomatism in arid lacustrine basins

Leising, Joseph Franklin

Titre : Constraints on salinity-driven convection and associated potassium metasomatism in arid lacustrine basins

Auteur : Leising, Joseph Franklin

Université de soutenance : University of Nevada, Reno

Grade : Doctor of Philosophy (PhD) 1999

Résumé
The Rayleigh number is a measure of dynamic stability in gravitationally unstable fluid systems. The present investigation addressed previous efforts that utilized properties of the Rayleigh number to propose that solute-induced buoyant convection beneath playas generated the widespread potassium metasomatism observed in the region near Socorro, New Mexico. Porflow ® , a commercial flow and transport code, was used to numerically model the effect of stratification on the Rayleigh number in simplified domains representing a playa subsurface. Geochemical modeling using PHREEQC tested three conceptual scenarios representing groundwater flow conditions that may have induced the metasomatism. Results indicate that under certain conditions stratification can enhance dynamic stability, and that solute-driven buoyant convection probably contributed to the Socorro area potassium metasomatism

Mots clés : Lacustrine basins, Convection, Salinity-driven, Geochemistry, Metasomatism, Potassium Hydrology, Geology, Arid, Earth sciences

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