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g. How is the clay mineral glauconite used to measure the age of sedimentary rocks? What problem exists with this radiometric dating method? h. Relative to C¹4 dating, what is meant by "old carbon" and rocks being "born old"? Why do tree rings and carbon dates not always agree in age? Explain. i. How are fission tracks measured? What age of materials is best measured by this method? Why?

g. How is the clay mineral glauconite used to measure the age of sedimentary rocks? What problem exists with this radiometric dating method? h. Relative to C¹4 dating, what is meant by "old carbon" and rocks being "born old"? Why do tree rings and carbon dates not always agree in age? Explain. i. How are fission tracks measured? What age of materials is best measured by this method? Why?

Applications and Investigations in Earth Science (9th Edition)
Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
Section: Chapter Questions
Problem 1LR
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Can you help with g,h, and I
oughout the e of the Earth hat values sistance. Paleozoic era? end of the mian? How e Eocene did it take is repre- ozoic era? million of the last of the off by -ns to the 10-step a. In Ph206 the K-Ar date on a biotite crystal was 160 million years. Assuming all of these values are useful, what overall history of this rock can be given? g. How is the clay mineral glauconite used to measure the age of sedimentary rocks? What problem exists with this radiometric dating method? h. Relative to C¹4 dating, what is meant by "old carbon" and rocks being "born old"? Why do tree rings and carbon dates not always agree in age? Explain. i. How are fission tracks measured? What age of materials is best measured by this method? Why? j. How do we know that the Earth once contained twice as much U238 and 40 times as much U235 as it currently does? What effect would that have on volcanic eruption, heat flow, and continental drift, if any? Explain. 9. Great Span of Geologic Time, Human Time versus Geologic Time. a. In the text, the divisions of geologic time and geo- logic events were compared to a 24-hour day. Other comparisons have been made relative to tall build- ings. How would such a comparison be made to the Willis (Sears) Tower in Chicago or the Empire State Bar Bc Br B D
Transcribed Image Text:oughout the e of the Earth hat values sistance. Paleozoic era? end of the mian? How e Eocene did it take is repre- ozoic era? million of the last of the off by -ns to the 10-step a. In Ph206 the K-Ar date on a biotite crystal was 160 million years. Assuming all of these values are useful, what overall history of this rock can be given? g. How is the clay mineral glauconite used to measure the age of sedimentary rocks? What problem exists with this radiometric dating method? h. Relative to C¹4 dating, what is meant by "old carbon" and rocks being "born old"? Why do tree rings and carbon dates not always agree in age? Explain. i. How are fission tracks measured? What age of materials is best measured by this method? Why? j. How do we know that the Earth once contained twice as much U238 and 40 times as much U235 as it currently does? What effect would that have on volcanic eruption, heat flow, and continental drift, if any? Explain. 9. Great Span of Geologic Time, Human Time versus Geologic Time. a. In the text, the divisions of geologic time and geo- logic events were compared to a 24-hour day. Other comparisons have been made relative to tall build- ings. How would such a comparison be made to the Willis (Sears) Tower in Chicago or the Empire State Bar Bc Br B D
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