Chemical geothermometry and geobarometry in hydrothermal aqueous solutions: A theoretical investigation based on a mineral-solution equilibrium model

Journal Article · Tue Oct 01 04:00:00 EDT 1991 · Geochimica et Cosmochimica Acta; (United States)

DOI:https://doi.org/10.1016/0016-7037(91)90438-B· OSTI ID:7051630

Chiodini, G ^[1]; Cioni, R ^[2]; Guidi, M; Marini, L ^[3]

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1. Univ. di Perugia (Italy)
2. Ist. di Geocronologia, Pisa (Italy)
3. Geotermica Italiana srl, Pisa (Italy)

The theoretical compositions of an aqueous solution in equilibrium with a mineral assemblage made up of low-albite, K-feldspar, either a Ca-Al-silicate or calcite, clinochlore, muscovite, quartz, anhydrite, and fluorite, under varying T-P{sub CO{sub 2}}-m{sub Cl} conditions of geothermal interest, indicate that (1) the total SO{sub 4} content as well as the Na/K,K{sup 2}/Mg, and SO{sub 4}/F{sup 2} ratios are potential geothermometers; (2) the total HCO{sub 3} content as well as the K{sup 2}/Ca,Ca/Mg, HCO{sub 3}/F, and (HCO{sub 3}){sup 2}/SO{sub 4} ratios are potential P{sub CO{sub 2}} indicators; (3) the Na, K, Ca, and Mg total contents as well as the Na{sup 2}/Mg and Na{sup 2}/Ca ratios are mainly controlled by the total ionic salinity and are therefore hardly suitable as geoindicators. A preliminary test of the equations involving total HCO{sub 3} content as well a K{sup 2}/Ca and HCO{sub 3}/F ratios as P{sub CO{sub 2}} indicators have provided satisfactory results.

• OSTI ID: 7051630
• Journal Information: Geochimica et Cosmochimica Acta; (United States), Journal Name: Geochimica et Cosmochimica Acta; (United States) Vol. 55:10; ISSN GCACA; ISSN 0016-7037
• Country of Publication: United States
• Language: English

Related Subjects

15 GEOTHERMAL ENERGY
152000* -- Geothermal Data & Theory
58 GEOSCIENCES
580000 -- Geosciences
ANHYDRITE
CALCITE
CARBONATE MINERALS
CHEMICAL COMPOSITION
CHEMISTRY
EQUILIBRIUM
FELDSPARS
FLUIDS
FLUORITE
GEOBAROMETRY
GEOCHEMISTRY
GEOTHERMAL FLUIDS
GEOTHERMAL SYSTEMS
GEOTHERMOMETERS
GEOTHERMOMETRY
HALIDE MINERALS
HYDROTHERMAL ALTERATION
HYDROTHERMAL SYNTHESIS
HYDROTHERMAL SYSTEMS
KINETICS
MEASURING INSTRUMENTS
MICA
MINERALS
MUSCOVITE
OXIDE MINERALS
PARAGENESIS
QUARTZ
REACTION KINETICS
ROCK-FLUID INTERACTIONS
SILICATE MINERALS
SULFATE MINERALS
SYNTHESIS
THERMOMETERS