Sm-Nd and Pb/Pb Isotopic Dating of Pre-Caledonian Granitic Rocks in Yunkai Area and its Significance
云开前加里东花岗质岩石Sm-Nd、Pb/Pb同位素定年及其意义

The whole rock banded-augen granitic rock samples form Yankai uplifted area are dated Sm_Nd and Pb/Pb isotopically 1414±68Ma and 1388±90Ma respectively. These data indicate that the orogeny took place not only in Caledonian but also in Late Mesoproterozoic, which secms more important and is correlatable with global Grenville orogeny.