Why radiometric dating works best for igneous rocks

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Why it is not possible to date ultrabasic igneous rocks? This page was last edited on 12 Mayat However, local eruptions of volcanoes or other events that give off large amounts of carbon dioxide can reduce local concentrations of carbon and give inaccurate dates. The rate of creation of carbon appears to be roughly constant, as cross-checks of carbon dating with other dating methods show it gives consistent results. What, if any, paleoclimate data can be derived from igneous rocks?

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Radiometric dating

The precision of a dating method depends in part on the half-life of the radioactive isotope involved. For rocks dating back to the beginning of the solar system, this requires extremely long-lived parent isotopes, making measurement of such rocks' exact ages imprecise. The scheme has a range of several hundred thousand years. Carbon, though, is continuously created through collisions of neutrons generated by cosmic rays with nitrogen in the upper atmosphere and thus remains at a near-constant level on Earth. This can be seen in the concordia diagram, where the samples plot along an errorchron straight line which intersects the concordia curve at the age of the sample. American Journal of Science.








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