Problem 47425. Uranium–Lead Dating

Created by David Hill

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<div style = "text-align: start; line-height: 20.44px; min-height: 0px; white-space: normal; color: rgb(0, 0, 0); font-family: Menlo, Monaco, Consolas, monospace; font-style: normal; font-size: 14px; font-weight: 400; text-decoration: none solid rgb(0, 0, 0); white-space: normal; "><div style="block-size: 63px; display: block; min-width: 0px; padding-block-start: 0px; padding-top: 0px; perspective-origin: 407px 31.5px; transform-origin: 407px 31.5px; vertical-align: baseline; "><div style="font-family: Helvetica, Arial, sans-serif; line-height: 21px; margin-block-end: 9px; margin-block-start: 2px; margin-bottom: 9px; margin-inline-end: 10px; margin-inline-start: 4px; margin-left: 4px; margin-right: 10px; margin-top: 2px; perspective-origin: 384px 31.5px; text-align: left; transform-origin: 384px 31.5px; white-space: pre-wrap; margin-left: 4px; margin-top: 2px; margin-bottom: 9px; margin-right: 10px; "><span style="block-size: auto; display: inline; margin-block-end: 0px; margin-block-start: 0px; margin-bottom: 0px; margin-inline-end: 0px; margin-inline-start: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px; perspective-origin: 0px 0px; transform-origin: 0px 0px; "><span style="">Using the input data set of the measured Pb-206/U-238 and Pb-207/U-235 ratios of several samples from the same Zircon specimen, determine the age of the specimen (rounded to 1e6 years) by the intersection of the concordant curve with the linear fit of the data. Use 7.04e8 and 4.47e9 for the half-lives of U-235 and U-238 to Pb-207 and Pb-206.</span></span></div></div></div>

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Last Solution submitted on Apr 16, 2022

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3 Comments

William on 11 Nov 2020

In each case, the linear fit intercepts the concordant curve in two places. I think it is the higher one that we are seeking, no? For 3 of the test problems (# 2,4,5) the solution given seems to be the lower one.

David Hill on 11 Nov 2020

Yes, you want the higher intercept. I will recheck this.

David Hill on 11 Nov 2020

Yes, you were correct. Sorry for the mistake. It has been fixed.

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Problem 47425. Uranium–Lead Dating

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Problem 47425. Uranium–Lead Dating

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