Question:
The 87Sr/86Sr ratio of a 1000 Ma granite was measured as 0.8001. If its 87Rb/86Sr ratio is 2.499, what was the Sr isotopic ratio of the source at the time of derivation of the granite? (decay constant of 87Rb=1.39 × 10-11 yr-1)
(Round off to three places of decimals)
The 87Sr/86Sr ratio of a 1000 Ma granite was measured as 0.8001. If its 87Rb/86Sr ratio is 2.499, what was the Sr isotopic ratio of the source at the time of derivation of the granite? (decay constant of 87Rb=1.39 × 10-11 yr-1)
(Round off to three places of decimals)
(Round off to three places of decimals)
Updated On: Oct 1, 2024
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Correct Answer: 0.765
Solution and Explanation
The correct answer is: 0.765 or 0.766(approx.)
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