Which of the following is NOT a radioisotopic dating method that is currently us

Question

Which of the following is NOT a radioisotopic dating method that is currently used (circle best answer)? U-Th/He (Uranium-Thorium/Helium) dating, K-Ar (Potassium-Argon) dating, Fe-Mg (iron-magnesium) dating; Rb-Sr (Rubidium-Strontium) dating, Lu-Hf(Lutetium Hafnium) dating, U-Pb (Uranium-Lead) dating Sedimentary rocks are seldom directly datable by radioisotopic means because, (circle best answer): they are highly radioactive, disrupting the radioisotopic "clock of the isotopic systems used for absolute dating, the only datable minerals are soluble in petroleum so they have been destroyed; they lack datable minerals that grew at the time the sediment turned to rock, they from too quickly to be dated, they form too slowly to be dated, it is too expensive to colic a sedimentary rock, it is illegal to collect sedimentary rocks.

Explanation / Answer

12. c) Fe -Mg (iron magnesium) dating method is not used in a radioisotopic method.Whereas all other methods like Uranium Thorium ,potassium Argon,Rubidium Strontium ,Luteium hafnium and Uranum lead are basically used for radioisotopic dating methods.

13. C) They lack datable minerals that grew at the time the sediemnts turned to rocks

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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