a. Calculate the slope m of a straight line connecting the two points:

Question

Several subsamples of a lunar meteorite collected in Antarctica were analyzed for dating by the Rb-Sr method. The analytical results for two subsamples are:

Subsampl	87Sr/86Sr	87Rb/86Sr
PX1,R	0.703415	0.07779
Pl2,R	0.699193	0.001330

The values define two points in the x-y plane where ⁸⁷Rb/ ⁸⁶Sr = x and ⁸⁷Sr/⁸⁶Sr = y

a. Calculate the slope m of a straight line connecting the two points:

b. Calculate a Rb-Sr date from the slope m using equation 8.11 in Science Brief 8.11.2

Answer 1

m = (0.703415 - 0.699193)/(0.07779 - 0.001330) = (0.004222)/(0.07646)

m = 0.055218