Abstract
AbstractThe samples of ductile‐rheologic deformational augen granite from the Yunkai uplift area, western Guangdong province, were determined by the whole‐rock Sm‐Nd, Pb‐Pb and Rb‐Sr isotopic dating to have an Sm‐Nd isochron age of 1414±68 Ma, a Pb‐Pb isochron age of 1388±90 Ma and a Rb‐Sr isochron age of 490±36 Ma. The first two ages are interpreted as the formation age of this suite of granite and the last age represents the timing of the tectono‐thermal event of Caledonian ductile‐rheologic shear partial melting. It is indicated that in the study area not only an orogeny took place in the Caledonian, but also a more important tectono‐magmatic activity occurred in the Meso‐proterozoic there, which may be related to the subduction‐collision between the Yangtze block and Cathaysia block.
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