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How to find age of rock 235U/207Pb, 238U/206Pb using ratios from Zircon sample of rock

Victoria79
wrote...
A month ago
 How to find age of rock 235U/207Pb, 238U/206Pb using ratios from Zircon sample of rock half life of 235U 207Pb = 704 million years with a decay life of 9.8485x10-10half life of 238U 206 Pb= 4.46 billion years with a decay constant of 1.55125x10-10Ratio:    206Pb/238U           207Pb/235Uzircon 1 :  0.732                       32.25What is the age of the rock. More zircon ratios continue below...I just need help working through one and I can probably do the rest. I've spent hours on this and it's just not making sense to me. Read 43 times 1 Reply

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Replies
wrote...
Educator
A month ago
 λ238 = 1.55125 ×10-10a-1 (t1∕2 = 4.468 gigayears or 1,000,000,000)λ235 = 9.8485 ×10-10a-1 (t1∕2 = 703.8 million years)For this, you'll need to know the U-Pb systemI found a tutorial here: https://www.ucl.ac.uk/~ucfbpve/geotopes/indexch5.html
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