Sm nd dating method

In addition, epsilon units will normalize the initial ratios to CHUR, thus eliminating any effects caused by various analytical mass fractionation correction methods applied.age to be calculated, fractionation between Nd/Sm would have to have occurred during magma extraction from the mantle to produce a continental rock.those that form during chemical reactions without breaking down).The unstable or more commonly known radioactive isotopes break down by radioactive decay into other isotopes.

Chondritic meteorites are thought to represent the earliest (unsorted) material that formed in the solar system before planets formed.

This led to the realization that Archaen continental igneous rocks that plotted within the error of the CHUR line could instead lie on a depleted mantle evolution line characterized by increasing Sm/Nd and Nd ratios over time.