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Radiometric dating sedimentary rocks

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Home How do geologists use radiometric dating to date sedimentary rock layers indirectly Note also an intrusion in my area! Following this article is used on sedimentary body. There are called zircon. Radiometric methods.

Sedimentary Rocks

Why Is Radiometric Dating Not Accurate For Sedimentary Rocks - Sedimentary Rocks

Minnesota is host to some of the oldest rocks on Earth; parts of the Morton gneiss in western Minnesota have been dated at 3. Rocks as old as or older than these are rare on earth because geologic processes on and within our active planet recycle old rocks and produce younger ones. The oldest mineral grains yet identified on Earth are about 4. Rocks brought back from the moon by astronauts, and meteorites that have fallen to Earth, are about 4. Because the moon, Earth, and the meteors probably formed at the same time concurrently with the rest of the solar system , we can conclude that the Earth itself is about 4. How do we know that the Morton gneiss is older or younger than other rocks?

Radiometric Age Dating

ANSWER: Sedimentary rocks cannot be dated directly using radiometric dating, which is based on the idea that when rocks are in liquid form, their radiometric clock resets. This technique is generally used to date igneous and metamorphic rock, which are rocks that were once melted due to extreme heat and pressure. Radiometric dating determines how long ago the liquid rock solidified into solid rock.
Sedimentary rocks do not work because they are made up of a mixture of deposits of many other types of rocks, each of which would point to a different age. You can use radiometric dating on sedimentary rocks but it will not give you a precise age. You would need many samples and it would give you a round-about depositional age range. For example if you dated a sediment that had samples at million years old, Ma, and 1.

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