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