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11. Use equations (9.15), (9.22) and (9.23) to construct a concordia diagram for 3500 Ma of...

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Chemistry

11. Use equations (9.15), (9.22) and(9.23) to construct a concordia diagram for 3500 Ma of Earthhistory. Begin with 1000 atoms each of 235U and238U at an initial time of 0 years, and increment timein 200 Ma increments, calculating N (the number of atoms remaining)and D* (the number of daughter isotopes = No-N) for bothdecay schemes at each increment. Then plot207Pb/235U vs.206Pb/238U to construct a concordiadiagram.

Once you have a diagram, add thefollowing points as a discordia:You can add the points in Excel bycopying them, selecting the chart, and using Paste-Special as a newseries. Draw a best-fit line through the discordia points andestimate the initial crystallization age and the metamorphicage.

207Pb/235U

206Pb/238U

5

0.240

10

0.355

12

0.400

15

0.470

17

0.520

19

0.560

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Equations1155125x1010 aos2984850x1010 aosYou calculate for each period of time and show the result in thenext    See Answer
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