What is It about most sedimentary rocks that makes them unsuitable for radioacti
ID: 802675 • Letter: W
Question
What is It about most sedimentary rocks that makes them unsuitable for radioactive dating? Why do we use Ar^40 in preference to Co^kj in K^a0 dating? what advantages does it have? Any disadvantages ? Recall the mineral composition of granite (Lab 4). Of the most common minerals found in granite which would be most suitable for K^ad dating? (There may be more than 1.) Radiometric dating of meteorites places the age of Earth at 4.54 billion years (4.54 times 10^s years). In contrast the oldest Earth rocks found so far (gneisses from the Northwest Territories of Canada) date to 4.03 times 10^9 years. What reasons can you think of to explain this 500 million year age discrepancy?Explanation / Answer
1) actually sedimentary rocks are formed by the disentigrated and decomposed products of pre existing rocks like igneous and metamorphic rocks . so they are just accumulations of different rock particles which are derived from different rocks. so that if we conduct a radiometric dating of thi sedimentary rock which is made by different rock products , we can only find the age of those particles only not the age of sedimentary rock.
so they are not suitable for radiometric datings