What is absolute age of sill based one its zircon crystals

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Reference no: EM133825822

Assignment:

The igneous sill shown in the Grand Canyon Diagram (PowerPoint & graphs Attached) is exposed on a hillside where it is completely surrounded by the Bass Dolomite. The sill contains zircon mineral crystals. Zircons typically incorporate uranium into their crystal lattice while they are growing. Your team used a mass spectrometer to determine the ratio of U235 to Pb207 from zircon samples taken from the sill. The analysis revealed that 37% of the atoms were U235 and 63% were Pb207. (For c & d, you can use relative aging from what was calculated in b). Explain how you came up with your answers.

a) About how many half-lives of U235 to Pb207 decay pair have elapsed since the zircon crystal formed?

b) What is the absolute age of the sill based one its zircon crystals? Show calculations.Use answer from a & Table 8.1 (Attached) to solve this problem.

c) What might be a good estimate of the minimum age of the Bass Dolomite based on the zircon age you have just calculated, and your understanding of the geologic principles discussed above? (Hint: use words like "more than," "less than," "at most").

d) What might be a good estimate of the minimum age of Unit M based on the zircon age and your understanding of the geologic principles discussed above?

e) What might be a good estimate of the maximum age of the Hakatai shale based on the zircon age and your understanding of the geologic principles discussed above?

Reference no: EM133825822

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