Sedimentery rocks are seldom directly datable by radioisotopic means because? a)

Question

Sedimentery rocks are seldom directly datable by radioisotopic means because?

a) they are highly radioactive, disrupting the radioisotopic "clock" of the isotopic systems used for absolute dating

b) they lack datable minerals that grew at the time the sediment turned to rock

c) they form too quickly to be dated

d) as the hosts of petroleum they are too valuable to be sampledfor radioisotopic dating

e) it is too difficult to collect a sample of a sedimentary rock

f) it is illegal to collect sedimentary rocks

Explanation / Answer

B is the answer

they lack datable minerals that grew at the time the sediment turned to rock

Sedimentary rocks are generally hard to date because common cements like silica don't have datable radioisotopes, and minerals like glauconite that are common in sedimentary rocks are very prone to resetting

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