Dating rocks with uranium 238
Organic material that has not fossilized and does not exceed 70,000 years of age can be dated by Carbon dating techniques.Sedimentary rock can only be dated by its association with igneous and metamorphic rock.Carbon-14 is present in the air, and is absorbed by plants during photosynthesis.When animals/people eat plant matter, they absorb the carbon-14 from the plants into their bodies.The four isotopes are uranium-235, uranium-238, lead-207, and lead-206.The process of dating finds the two ratios between uranium-235 and lead-207; and uranium-238 and lead-206.Radiometric dating is the principal source of information about the absolute age of rocks and other geological features, including the age of the Earth itself, and can be used to date a wide range of natural and man-made materials.
Since the formation of certain minerals precludes the existence of lead but not uranium, it can be certain that when the mineral was formed it no lead in it.
Uranium-Lead dating is a radiometric dating method that uses the decay chain of uranium and lead to find the age of a rock.
As uranium decays radioactively, it becomes different chemical elements until it stops at lead.
This technique is primarily used to date igneous rocks.
Radioactive dating is only useful in dating igneous and metamorphic rock.
Search for dating rocks with uranium 238:
It has a half-life of 5730 years and so the mass of C14 remaining in a fossilised rock can be used to determine the age of the rock.