What method (or methods) would be most suitable for finding the radiometric age
ID: 232648 • Letter: W
Question
What method (or methods) would be most suitable for finding the radiometric age of the following? Give reasons for your answers.
a) Precambrian granite
b) early Paleozoic evaporite deposit
c) early Tertiary shale containing carbonized wood fragments
d) Proterozoic Basalt
e) garnet-pyroxene skarn from a metamorphic rock at a granite contact
Table SEQ Table * ARABIC 1 Common Systems for Geochronology
Parent
Daughter
(yr)-1
t½ (yr)
Max age (yr)
Min Age (yr)
238U
206Pb
1.55×10-10
4.47×10+09
T
1.00×10+07
235U
207Pb
9.85×10-10
7.04×10+08
T
1.00×10+07
232Th
208Pb
4.95×10-11
1.40×10+10
T
1.00×10+07
87Rb
87Sr
1.42×10-11
4.88×10+10
T
1.00×10+07
40K
40Ar
5.81×10-11
1.19×10+10
T
1.00×10+03
147Sm
143Nd
6.54×10-12
1.06×10+11
T
14C
14N
1.21×10-04
5.73×10+03
70000
0
176Lu
176Hf
1.94×10-11
3.57×10+10
187Re
187Os
1.64×10-11
4.23×10+10
T = age of the earth
Parent
Daughter
(yr)-1
t½ (yr)
Max age (yr)
Min Age (yr)
238U
206Pb
1.55×10-10
4.47×10+09
T
1.00×10+07
235U
207Pb
9.85×10-10
7.04×10+08
T
1.00×10+07
232Th
208Pb
4.95×10-11
1.40×10+10
T
1.00×10+07
87Rb
87Sr
1.42×10-11
4.88×10+10
T
1.00×10+07
40K
40Ar
5.81×10-11
1.19×10+10
T
1.00×10+03
147Sm
143Nd
6.54×10-12
1.06×10+11
T
14C
14N
1.21×10-04
5.73×10+03
70000
0
176Lu
176Hf
1.94×10-11
3.57×10+10
187Re
187Os
1.64×10-11
4.23×10+10
T = age of the earth
Explanation / Answer
The choice of radiometric dating depends upon the availability of the parent and daughter elements in the rock as well as their half life and the age of the rock. Considering these factors the followinga re the choices.
a) 238U-206Pb
b) 235U-207Pb
c) 14C-14N
d) 87Rb-87Sr
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