Calculate the Rb-Sr isochron age and initial 87 Sr/ 86 Sr ratio of a suite of wh

Question

Calculate the Rb-Sr isochron age and initial 87Sr/86Sr ratio of a suite of whole-rock samples from the Amitsoq gneiss near Godthaab, Greenland, based on the following data and equation.

( (lambda) = 1.42x10^-11 a-1)

Sample

87Rb/86Sr

87Sr/86Sr

1

2.098

0.8245

2

0.198

0.7096

3

1.173

0.7668

4

2.033

0.8191

5

1.364

0.7791

6

0.319

0.7163

The answer to the question above is:

(87Rb/86Sr)0 = 0.6971

Slope = 0.006022

t = 4119 x 106 a

Please show all the steps to get this answer. Thank you.

Sample

87Rb/86Sr

87Sr/86Sr

1

2.098

0.8245

2

0.198

0.7096

3

1.173

0.7668

4

2.033

0.8191

5

1.364

0.7791

6

0.319

0.7163

Explanation / Answer

Calculate the Rb-Sr isochron age and initial 87 Sr/ 86 Sr ratio of a suite of wh

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