The following sulphur isotopic data were obtained for a sulphide ore in mexico.

sample 

34s galena (ga) ‰ 

34 s sphalerite (sp) ‰ t in c

1 -1.15 +0.95

2 -1.11 +0.87

3 -1.42 +1.03

4 -1.71 +0.01

the fractionation, sp-ga, between sphalerite and galena has been found to vary with temperature as:

6

2

sp 1.02 10

ga

x

t

 =

a. calculate the temperature in c at which each mineral pair equilibrated and fill the results in the

table above! (show one example of the calculation procedure here! )