Premium
Density Calculation for NaCl‐H 2 O Solutions in the Liquid‐Solid Two‐Phase Field in NaCl‐H 2 O Three‐Phase Inclusions
Author(s) -
Wenming CHEN,
Yong WANG,
Weishi CHEN
Publication year - 2015
Publication title -
acta geologica sinica ‐ english edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 61
eISSN - 1755-6724
pISSN - 1000-9515
DOI - 10.1111/1755-6724.12489
Subject(s) - halite , fluid inclusions , analytical chemistry (journal) , phase (matter) , chemistry , hydrothermal circulation , mineralogy , materials science , geology , metallurgy , chromatography , organic chemistry , gypsum , seismology
Three‐phase NaCl‐H 2 O fluid inclusions featuring halite dissolution temperature ( T m) higher than vapor bubble disappearance temperature ( T h ) are commonly observed in porphyry copper/molybdenum deposits, skarn‐type deposits and other magmatic ‐ hydrothermal ore deposits. Based on | ΔV 1 | (the absolute value of volume variation of NaCl‐H 2 O solution in a heating or cooling process of inclusions)= | ΔV s | (the absolute value of volume variation of the halite crystal in a heating or cooling process of inclusions) and on the principle of conservation of the mass of NaCl and H 2 O, we systematically calculated the densities of NaCl‐H 2 O solutions in the solid‐liquid two‐phase field for temperatures ( T h ) from 0.1°C to 800°C and salinities from 26.3 wt% to 99.2wt%. Consequently for the first time we obtained the upper limit of the density of NaCl‐H 2 O solutions in the solid‐liquid two‐phase field for T h < T m inclusions with variant salinities. The results indicate that for inclusions of the T h < T m type with the same T h , the higher the T m or salinity is, the higher the density of the NaCl‐saturated solution will be. If a group of fluid inclusions were homogeneously trapped, they must have the same T h value and the same T m or salinity value. This may be used to distinguish homogeneous, inhomogeneous, and multiple entrapments of fluid inclusions.