Thus the different tectonic units have different late Archean tectonometamorphic histories. Trace element geochemistry as well as Pb + Nd isotope characteristics of the SMZ are similar to those of the Kaapvaal Craton, with low Th and U concentrations around 2 and 0.7 ppm.
The diverse tectonic units exhibit different late Archean metamorphic histories, with similar trace element geochemistry and Pb + Nd isotope characteristics to the Kaapvaal Craton, characterized by low Th and U concentrations around 2 and 0.7 ppm.