10. Analysis of Dike X in Figure 1 yielded 30,000 daughter atoms and 2,000 paren

Question

10. Analysis of Dike X in Figure 1 yielded 30,000 daughter atoms and 2,000 parent atoms. On the basis of this ratio, how many half-lives have passed since the mineral formed?

(1) 1

(2) 2

(3) 3

(4) 4

(5) 5

and

10b) If the isotope from the previous question has a half-life of 4 million years, what is the age of Dike X?

(1) 4

(2) 8

(3) 12

(4) 16

Figure 1 shows a cross-section (a vertical cut through the Earth) of several layers that have undergone several geological events, including, faulting, intrusion by dikes, erosion, deposition of sedimentary layers, etc. (not neccessarily in this order). Names such as Ordovician, Siliurian, Devonian, etc. refer to time periods in the Geologic Time Scale (see book) Cretaceous shale & sandstone Cretaceous conglomerate Precambrian granite Precambrian granite

Explanation / Answer

10

A) answer 4

Given parent: daughter= 2000:30000 = 1:15

Which indicate 4 half lifes.

If it's 1:1 the 1 half-life

1:3 -2

1:7- 3

1:15 -4

B)obtained half life is cycle is 4 and each half life is 4mil years

So total 4x4 = 16mil years

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