GEO 1013 Module 08 INV PDF

Preview

Summary

assignment module 8...

Description

GEO 1013 – Investigation 8 Worksheet Relative Dating Using the letters on the following diagram, place the sequence of events in order from youngest to oldest and answer the questions that follow.

1. Ordering: Put the letters in the above diagram in the correct order from youngest to oldest:

NRTAHDPFLSGJZBEKXMOCV Angular 2. Below bed L there is a ___________________unconformity superposition 3. Beds F and L represent the Principle of ________________________. Principle of Cross Cutting Relationship 4. What principle tells you the relative age of S versus M? _____________________________________

5. A and S are igneous rocks. A has been dated at 66 million years, and S has been dated at 180 million years. Which of the following is a correct statement about the relative age of X? a) b) X is 180 million years old. c) X is between 180 and 66 million years old. d) X is tilted, so its relative age cannot be determined.

disconfirmity(as sedimentary layer) 6. What type of unconformity lies between O and V? ___________________________________

7. If you find a fossil in J that is 75 million years old, and you know that S is 180 million years old, how old is Z? a) Z is younger than 75 million years old. b) Z is 75 million years old. c) d) Z is tilted, so its relative age cannot be determined.

Radiometric Dating Using the following graph, answer the questions below. The red curve is the parent atom curve and the blue curve is the daughter atom curve.

25% 8. What percentage of parent atoms will remain after 2 half-lives have passed? ___________________ 75% 9. In question 8, what percentage of daughter atoms will the sample have? ______________________ 500

10. If one half-life equals 500 years, and you have 25% parent atoms, how old is the sample? ___________________

0.5 11. If you have approximately 70% parent atoms, how many half-lives have passed for this sample? ______________

2

2000 12. If a half-life is 4000 years, how old is the sample in question 11? _________________________

13. Potassium-40 is a radiogenic isotope with a half-life of 1.26 million years. If you have 35% of the Potassium-40 parent isotopes left in the rock, how old is this sample? a) 189 years b) 1,890 years c) 189,000 years d) 14. Argon-40 is the daughter product of Potassium-40. What percentage of Argon-40 would you have in the sample in 75% question 13? _________________________

500 15. If you have 125 parent atoms and 375 daughter atoms, how many half lives has this sample had? _______________

16. If one half -life of the parent atoms in question 15 is 700 years, how old is the sample in question 15? 1400 __________________________

3...