21. How might heating "reset" an isotopic clock during high-grade metamorphism? (A) By driving daughter atoms out of the crystal; (B) by turning all daughter atoms back into parent atoms; (C) by temporarily halting radioactive decay, until the rock cools down; (D) by melting the rock completely. 22. The uranium-lead (U-Pb) isotopic age of a zircon crystal in beach sand at Padre Island would date what geologic event? (A) deposition of the zircon grain in the beach; (B) age of the supernova explosion (C) age of the source rock that was eroded to make the sand grain; (D) diagenesis in the beach sand that precipitated zircon from ions in solution. 23. You date a zircon mineral contained in an igneous rock and find that it has 4,000,000 atoms of parent element U and 12,000,000 oms of daughter element Pb. How many half-lives has this mineral undergone? that created uranium, before the solar system formed; (A) you cannot determine this from this information (B) one half life (C) two half lives (D) three half lives 24. If the amount of time for U-Pb to go through one half life is 700 million years, how old is this zircon (A) you cannot determine this from this information (B) 1,400 million years (C) 21,000 million years (D) 2 million years 25. Which of the following is a reasonable interpretation of this U-Pb age? The age reflects the time when: (A) a magma body solidified into an igneous rock containing the zircon; (B) the age of the mantle that formed the igneous rock; (C) the age of the Earth; (D) I have no idea 26. Reverse faulting is most often associated with mountain building along boundaries, whereas normal faulting is generally observed at (A) divergent; transform (B) transform; convergent (C) convergent; divergent (D) divergent; convergent boundaries.
21. How might heating "reset" an isotopic clock during high-grade metamorphism? (A) By driving daughter atoms out of the crystal; (B) by turning all daughter atoms back into parent atoms; (C) by temporarily halting radioactive decay, until the rock cools down; (D) by melting the rock completely. 22. The uranium-lead (U-Pb) isotopic age of a zircon crystal in beach sand at Padre Island would date what geologic event? (A) deposition of the zircon grain in the beach; (B) age of the supernova explosion (C) age of the source rock that was eroded to make the sand grain; (D) diagenesis in the beach sand that precipitated zircon from ions in solution. 23. You date a zircon mineral contained in an igneous rock and find that it has 4,000,000 atoms of parent element U and 12,000,000 oms of daughter element Pb. How many half-lives has this mineral undergone? that created uranium, before the solar system formed; (A) you cannot determine this from this information (B) one half life (C) two half lives (D) three half lives 24. If the amount of time for U-Pb to go through one half life is 700 million years, how old is this zircon (A) you cannot determine this from this information (B) 1,400 million years (C) 21,000 million years (D) 2 million years 25. Which of the following is a reasonable interpretation of this U-Pb age? The age reflects the time when: (A) a magma body solidified into an igneous rock containing the zircon; (B) the age of the mantle that formed the igneous rock; (C) the age of the Earth; (D) I have no idea 26. Reverse faulting is most often associated with mountain building along boundaries, whereas normal faulting is generally observed at (A) divergent; transform (B) transform; convergent (C) convergent; divergent (D) divergent; convergent boundaries.
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
Related questions
Question
Transcribed Image Text:21. How might heating "reset" an isotopic clock during high-grade metamorphism?
(A) By driving daughter atoms out of the crystal;
(B) by turning all daughter atoms back into parent atoms;
(C) by temporarily halting radioactive decay, until the rock cools down;
(D) by melting the rock completely.
22. The uranium-lead (U-Pb) isotopic age of a zircon crystal in beach sand at Padre Island would
date what geologic event?
(A) deposition of the zircon grain in the beach;
(B) age of the supernova explosion that created uranium, before the solar system formed;
(C) age of the source rock that was eroded to make the sand grain;
(D) diagenesis in the beach sand that precipitated zircon from ions in solution.
23. You date a zircon mineral contained in an igneous rock and find that it has 4,000,000 atoms
of parent element U and 12,000,000 atoms of daughter element Pb. How many half-lives has this
mineral undergone?
(A) you cannot determine this from this information
(B) one half life
(C) two half lives
(D) three half lives
24. If the amount of time for U-Pb to go through one half life is 700 million years, how old is this
zircon
(A) you cannot determine this from this information
(B) 1,400 million years
(C) 21,000 million years
(D) 2 million years
25. Which of the following is a reasonable interpretation of this U-Pb age? The age reflects the
time when:
(A) a magma body solidified into an igneous rock containing the zircon;
(B) the age of the mantle that formed the igneous rock;
(C) the age of the Earth;
(D) I have no idea
26. Reverse faulting is most often associated with mountain building along
boundaries, whereas normal faulting is generally observed at
(A) divergent; transform
(B) transform; convergent
(C) convergent; divergent
(D) divergent; convergent
boundaries.
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