Mineral 87 Sr/ 86 Sr 87 Rb/ 86 Sr ______________________________________________
ID: 914625 • Letter: M
Question
Mineral 87Sr/86Sr 87Rb/86Sr
__________________________________________________________
1 0.706196 0.20
2 0.709965 0.83
3 0.713973 1.50
4 0.723544 3.10
__________________________________________________________
Explanation / Answer
In isochrom method we plot 87Sr/86Sr (y) against 87Rb/86Sr (x)
we will compare the graph with
y = c + x m
The slope of line will give age of mineral and the intercept (c) gives the initial 87Sr/86Sr ratio of the system
So the slope = age of mineral = 0.0082
And intercept = 0.5464