Radioactive dating works best with what type of rocks 13 year age gap dating

) is a common type of felsic intrusive igneous rock that is granular and phaneritic in texture.Granites can be predominantly white, pink, or gray in color, depending on their mineralogy.Granitoid is a general, descriptive field term for lighter-colored, coarse-grained igneous rocks.

When a granitoid is devoid or nearly devoid of plagioclase, the rock is referred to as alkali feldspar granite.These are rare, because it is difficult to turn basalt into granite via fractional crystallisation.A-type or anorogenic granites are formed above volcanic "hot spot" activity and have a peculiar mineralogy and geochemistry.Both of these types of granite are formed by the melting of high grade metamorphic rocks, either other granite or intrusive mafic rocks, or buried sediment, respectively.M-type or mantle derived granite was later proposed to cover those granites that were clearly sourced from crystallized mafic magmas, generally sourced from the mantle.

Radioactive dating works best with what type of rocks