Differential thermal analysis of the liquidus relations in the system NaCl-H sub 2 O to 6 kbar

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)90446-C· OSTI ID:7044686

Koster van Groos, A F ^[1]

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1. Univ. of Illinois, Chicago (United States)

The liquidus relations in the system NaCl-H{sub 2}O were investigated between 300 and 925C and between 0.4 and 6 kbar for compositions between 27.6 and 100 mol% NaCl by high-pressure differential thermal analysis. The PT slope of the liquidus increases from 10.5C/kbar for a composition with 27.6 mol% NaCl to 20.8C/kbar with 90 mol% NaCl to 21.8C/kbar with pure NaCl. The PT slope of the vapor saturation surface at the composition with 27.6 mol% NaCl is linear over the pressure range investigated and has a slope of 294C/kbar. On the basis of the experiments the composition of the liquids along the NaCl-rich part of the three-phase assemblage halite + liquid + vapor was determined: the liquid composition varies nearly linearly to within 0.5 wt% NaCl at temperatures above 480C, following the expression wt% (NaCl) = 0.1412T (C) - 12.96.

• OSTI ID: 7044686
• 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

58 GEOSCIENCES
580000* -- Geosciences
ALKALI METAL COMPOUNDS
CHEMISTRY
CHLORIDES
CHLORINE COMPOUNDS
DIAGRAMS
DIFFERENTIAL THERMAL ANALYSIS
DISSOLUTION
FLUIDS
GASES
GEOCHEMISTRY
HALIDE MINERALS
HALIDES
HALITE
HALOGEN COMPOUNDS
HYDROGEN COMPOUNDS
INCLUSIONS
LIQUIDS
MINERALS
NUCLEATION
OXYGEN COMPOUNDS
PHASE DIAGRAMS
PHASE STUDIES
PHASE TRANSFORMATIONS
SODIUM CHLORIDES
SODIUM COMPOUNDS
SOLUBILITY
THERMAL ANALYSIS
VAPORS
WATER