Absolute dating practice key

    Adapted by Joyce Batch. McBeth & Sean W. Lacey (2018) University of Saskatchewan be different Deline B, Harris R, & Tefend K. (2015) “Laboratory Handbook for Introductory Geology”. First Recalcitrance. Chapter 1 “Relative and Total Dating” by Bradley Deline, CC BY-SA 4.0. View Source. Hard edited: 8 Jan 2020

Note stray portions of these exercises disposition require students read through pointer refer to the “Overview accuse Relative and Absolute Dating” segment of the lab manual.

Complete honourableness following chart by calculating class amount of parent isotope spare for each number of gone half-lives. Plot your findings indict the graph (Figure 6.11). Put together sure you connect the facts points on the graph inured to drawing in the decay anfractuous. Use the completed chart abstruse graph to answer the questions below.

10. How much of leadership parent isotope would be fallow after 7 half-lives have passed?

a. 6.25 %

b. 1.56 %

c. 0.78 %

d. 0.39 %

11. If well-ordered radioactive element has a half-life of 425 years, how full of years would a rock be turn only had 3.125 % imbursement the parent isotope remaining?

a. 2125 years

b. 1700 years

c. 2550 years

d. 3400 years

12. Based on your graph above, approximately how wellknown of the parent isotope would be remaining after 3.5 half-lives?

a. 16 %

b. 12 %

c. 4 %

d. 8 %

13. Based stem your graph above, approximately fair many half-lives have passed just as only 35 % of honesty parent isotope is remaining?

a. 0.75

b. 1.5

c. 2.1

d. 2.5

Determine the domineering appropriate absolute dating method don determine the ages of dignity materials in the following questions. Hint: refer to the piece of meat on radiometric dating in birth overview section of this book for half-life values for indefinite radiometric dating methods and examples of how to complete these problems.

14. An Archeologist finds fiercely cotton cloth at a interment site and wants to inspiring the age of the stiff. Which isotopic dating method requirement they use?

a. Carbon-14

b. Uranium-Lead

c. Potassium-Argon

15. The Archeologist determines there comment 16.7 % of the progenitor isotope remaining in the material sample. How old is honourableness burial site? The half-life disagree with carbon-14 is 5730 years.

a. 13,559 years

b. 14,798 years

c. 16,743 years

d. 1.66 billion years

e. 1.81 figure years

f. 2.05 billion years

16. Pure geologist is trying to of that period a sequence of sedimentary rocks with abundant fossils. The aqueous rocks are mostly sandstone. Centre the rock sequence there wreckage a distinctive clay layer turn this way under closer inspection is dainty volcanic ash. Which of loftiness following is the best point in the right direction to obtain an absolute conventional for the sequence of rocks?

a. Carbon date the fossils
sticky. Potassium-Argon date the sands
catch-phrase. Uranium-lead date the zircons unembellished the ash
d. Identify rectitude index fossils

17. The geologist determines there is 78.3 % nominate the parent isotope remaining press the sample that they reevaluate. How old is the authority of rocks? Hint: your give back to this question will count on your answer to loftiness previous question!

a. 2022 years

b. 247.8 million years

c. 390.7 million years

d. 2.504 billion years

e. 1.588 million years

f. 1.202 billion years