In Roth, Etienne; Poty, Bernard eds. Precision is more intriguing and metamorphic the newly forming sun converged and why? Closure temperatures are so high that they are not a concern. Radiocarbon dating can be used on sediments or sedimentary rocks that contain carbon, but it cannot be used on materials older than about 60 ka. Thus an igneous or metamorphic rock or melt, which is slowly cooling, does not begin to exhibit measurable radioactive decay until it cools below the closure temperature.
Radiometric dating of minerals in metamorphic rocks usually indicates the age of the metamorphism.
8.4 Isotopic Dating Methods
Using geochemical data: Igneous rocks. Annales Geophysicae. Instead, they are a consequence of background radiation on certain minerals. Over time, the 40 K in the feldspar decays to 40 Ar.