When that mineral forms and the rock cools enough that argon can no longer escape, the "radiometric clock" starts. Track course progress. Chronostratigraphy Geochronology Isotope geochemistry Law of superposition Luminescence dating Samarium—neodymium dating. So, we rely on radiometric dating to calculate their ages. As a result, xenoliths are older than the rock which contains them
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These methods use the principles of stratigraphy to place events recorded in rocks from oldest to youngest. Intro to Meteorology. Keep playing. Remanent magnetization in ancient rocks that records the orientation of the earth's magnetic field and can be used to determine the location of the magnetic poles and the latitude of the rocks at the time the rocks were formed. Eyes on Environment. Become a Member Already a member? Radiocarbon dating is a method used to determine the age of organic material by measuring the radioactivity of its carbon content.