3. Please order from youngest to oldest, each each labeled rock package or geolo

Question

3. Please order from youngest to oldest, each each labeled rock package or geologic feature in the photograph below. Granite Dike Fault Cracks Youngest _ Oldest Assume now, that radiometric dating (the K-Ar method) is used to date the granite and dike, and the values obtained for the 40Ar/4°K ratio are listed below. Use the included plot of ratio vs. time to answer the following questions. Granite Ratio: 0.0048 0.00 Dike Ratio: 0.0009 0.00 4C What is the age of the Granite? 90.00 0.00 0 20.00 What is the age of the dike? What is the oldest age you can assign to the fault, 00 based on the ages you determined above? 0 10 20 30 40 50 60 70 80 90 100 time, my

Explanation / Answer

3. Youngest   Fault

                    Dike

                    Cracks

      Oldest     Granite

The Granite is the oldest here as it is effected by everything else.The cracks came after granite as it effects it.The dike came after the cracks as the cracks had no impact on the dyke.The fault is the youngest since it effects the dike i.e. there is a slip.

Using the given diagram, The age of the granite is 84 million years(approx).

                                    The age of the dike is 16 million years(approx).

Since the fault is the youngest geological event that has taken place, <16 million years would be the correct way to answer the age of the fault.

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