Radioactive dating sedimentary rock who is choi seung hyun dating
You can't date all minerals using the radiometric dating method because not all minerals have radioactive isotopes.In addition, the parent and daughter isotopes must remain together in a rock to use them to determine the rock's age.Radiometric dating uses knowledge of the decay rates of unstable ( radioactive ) nuclei to determine, by comparison with the proportion of stable nuclei in a fossil sample, the date of the introduction of the radioactive material into the live organism, especially if the isotope was ingested while the organism was alive. Radioactive dating is taking an element from a sample with a known rate of decay and invert the equation to find the time(date) from which it started to decay.Relative dating determines the period of time from which an object come from based on technology, soil, anthropology, etc.Before absolute dating techniques were discovered, the age of a rock was a guesstimate at best.Radioactive dating allows us to find an approximate date.Sedimentary rock is composed of the weathered remains of a variety of rocks of all ages.
It would not be the actual age because you need to date the radioactive isotopes for that.
In most cases, all we have to date are the clasts in the sedimentary rock.
Dating the clasts, however, would yield the age of the source rock from which they were derived rather than the current sedimentary rock.
If an igneous rock, this will mark the time when the magma or lava cooled enough for the mineral to crystallise.
It cannot be used to date sedimentary rocks, because the minerals within them will actually be older than the sedimentary rock itself.The appearance of these index fossils indicates the geologic age in which they appeared. Because most sedimentary rocks are composed of sediment which derived from many sources any dating process would find many different results.