Geochemistry Team Member / John Kaszuba / C-INC

	Geochemistry Team Members, C-INC

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Paul Reimus,
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Revised 7/15/05

	John Kaszuba
	John P. Kaszuba, Ph.D. Statement of Research Interests Dr. Kaszuba is a geochemist with the Isotope and Nuclear Chemistry Group of the Chemistry Division at Los Alamos National Laboratory (LANL). His diverse research interests include multi-phase geochemistry as applied to a wide range of geologic systems (including fluid-rock reaction in the crust, silicate-H₂O-CO₂ equilibria, structure in melts and glasses); environmental geochemistry, especially heterogeneous reaction in geo-engineered systems; and petrology. His focus is fluid-rock reactions, particularly enhanced reactivity of immiscible fluids and fluids evolution in geochemical and petrologic systems. Dr. Kaszuba has been fortunate to conduct research and serve as Principal Investigator on LANL projects that meld service to the nation with personal research interests that are more fundamental in character. In collaboration with LANL colleagues, Dr. Kaszuba has resurrected the hydrothermal lab that was previously active during the "heyday" of LANL's geothermal research. Dr. Kaszuba and colleagues are now conducting experimental and thermodynamic investigations of multiphase (H₂O-CO₂) fluid-rock interactions at geologic temperature and pressure conditions ranging from ambient hydrosphere to subgreenschist facies. Together with colleagues in academia, they are beginning to investigate relevant field locations for their work. Research problems include classic geologic questions on the origin and distribution of carbonate cements and veins in sedimentary basin sandstones, petrogenesis of carbonate veins in ore deposits and metamorphic rocks, and developing issues of sequestration of anthropogenic carbon (figure below).

	Schematic cross-section presenting geochemical processes (pink labels) that may occur after emplacing supercritical CO₂ into a saline aquifer. Besides aqueous dissolution of supercritical CO₂ and precipitation of carbonates (left side of diagram), dissolution and precipitation may occur at the interface between immiscible supercritical CO₂ and the silicate-bearing aquifer and aquitard. Brine desiccation may produce density contrasts. The plot depicts fugacity-mole fraction CO₂ relationships. Supercritical CO₂ provides a reservoir of constant fugacity free to react within the geochemical environment. After Kaszuba et al ., 2002, 2003.
	Papers Kaszuba, John P., Janecky, David R., and Snow, Marjorie G., 2004, Experimental evaluation of mixed fluid reactions between supercritical carbon dioxide and NaCl brine: Relevance to the integrity of a geologic carbon repository: Chemical Geology, in review. (Kaszuba et al, 2003, submitted) Kaszuba, John P., Janecky, David R., and Snow, Marjorie G., 2003, Carbon dioxide reaction processes in a model brine aquifer at 200°C and 200 bars: Implications for geologic sequestration of carbon: Applied Geochemistry, v. 18, no. 7, p. 1065-1080. (Kaszuba et al, 2003.pdf) Talks Kaszuba, John P., Janecky, David R., and Snow, Marjorie G., 2003, Enhanced solubility of silica and accelerated fluid-silicate reaction rates in an experimental supercritical carbon dioxide-brine-rock system: Geological Society of America, Abstracts with Programs, v. 35, no. 6, abstract 242-9 (Kaszuba et. al., 2003, CO₂ talk to GSA.pdf). Kaszuba, John P., Janecky, David R., and Snow, Marjorie G., 2002, Experimental evaluation of mixed fluid reactions between supercritical carbon dioxide and a NaCl brine: Relevance to geologic aquifer carbon sequestration: Geological Society of America, Abstracts with Programs, v. 34, no. 6, #135-3, p. 304 (Kaszuba et. al., 2002, CO₂ talk to GSA.pdf). Kaszuba, John P., Janecky, David R., and Snow, Marjorie G., 2001, Carbon dioxide reaction processes in a model brine aquifer at 200°C and 200 bars: Implications for subsurface carbon sequestration: Geological Society of America, Abstracts with Programs, v. 33, no. 7, p. A-232 (Kaszuba et. al., 2001, CO₂ talk to GSA.pdf). Geochemical and Biogeochemical Mechanisms of Contaminant Attenuation in a Multi-Layered Permeable Reactive Barrier (download pdf presentation).

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