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GEOL 104 Lab #8 Absolute Dating 1. Zircons collected from a granite outcrop were assayed and found to contain 25% Uranium and 75% lead. Given a half-life of 50 million years, how old is the rock? 2. A rock sample was determined by your laboratory to be 80 million years old. Given a half-life of 20 million years, how much daughter element was present? 3. If a rock sample contains 87.5% daughter element, how many half-lives have passed? 4. Your rock sample’s parent isotope has a half-life of 250 million years. If the sample contains 25% parent and 75% daughter, how old is the rock? 5. A rock you dug from the garden was submitted to a geochronology lab for testing and found to be 100 million years old. The laboratory found that the rock contained 23% parent isotope. Approximately how many half-lives have passed? 6. A modern controversy by some maverick, so-called historians wishes to prove that the Great Pyramid of Egypt was built more than 10,000 years ago instead of the generally understood age of 5600 years ago. They propose to date the Cretaceous limestone used to construct the pyramid by using Carbon-14. Will they be successful in proving the pyramid was built 10,000 years ago? If not, why not? HINT: C-14 has a half-life of 5730 years and a maximum utility of 50,000 to 100,000 years. Part 2. For each Figure Fill out the layers from youngest to oldest based on laws of relative dating. ...
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