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The composition of fluid inclusions in the H_2O-NaCl-CaCl_2 system has been generally graphically estimated using the melting temperatures of hydrohalite(T_(m-HH))and ice(T_(m-ice)).Here we present two equations that can be used to calculate the relative proportion of NaCl(i.e.,NaCl/[NaCl+CaCl_2],or X_(NaCl))and the total salinity( i.e.,NaC1 + CaC12,wt% )for fluid inclusions with ice as the last melting phase.X_(NaCl)can be calculated from T_(m-HH)using the following equation: y=(a+bx)~(-1/c) where y is X_(NaCl),x is T_(m-HH),a=0.33124402,b=-0.031518028,and c=0.22932736.In the cases where only T_(m-ice)is measured and T_(m-HH)is not known,T_(m-ice)can be used as the maximum possible TIn.nil to calculate the maximum value of X_(NaCl)using the above equation.In these cases,the following equation can be used to calculate the maximum total salinity: y=(a+bx+cx~2)~(-1) where y is salinity,x is T_(m-HH),a=0.057184817,b=0.00078565757,and c=5.7262766E-6.Because the isothems in the field of ice are sub-parallel to the NaCl-CaCl_2 binary side in the H20-NaC1-CaC12 ternary system,the errors in salinity calculation introduced by the above approximation are small(less than 2 wt% ).A Windows program for calculation of X_(NsCl)and salinity is available at: http://uregina.ca/～chiguox.
The composition of fluid inclusions in the H 2 O-NaCl-CaCl 2 system has been roughly graphically estimated using the melting temperatures of hydrohalite (T_ (m-HH)) and ice (T m- ice). Here we present two equations that can (ie, NaCl / [NaCl + CaCl_2], or X_ (NaCl)) and the total salinity (ie, NaC1 + CaC12, wt%) for fluid inclusions with ice as the last melting phase Where y is X_ (NaCl), x is T_ (m-HH) and X is T_ (m-HH) , a = 0.33124402, b = -0.031518028, and c = 0.22932736.In the cases where only T_ (m-ice) is measured and T_ (m-HH) is not known, T_ (m-ice) can be used as the maximum possible TIn.nil to calculate the maximum value of X_ (NaCl) using the above equation.In these cases, the following equation can be used to calculate the maximum total salinity: y = (a + bx + cx ~ 2) ~ ( -1) where y is salinity, x is T_ (m-HH), a = 0.057184817, b = 0.00078565757, and c = 5.7262766E-6.Because the isothems in the field of ice the sub-parallel to the NaCl-CaCl 2 binary side in the H20-NaC1-CaC12 ternary system, the errors in salinity calculation introduced by the above approximation are small (less than 2 wt%). A Windows program for calculation of X_ (NsCl ) and salinity is available at: http://uregina.ca/~chiguox.