Abstract:

From the view-points of petrographyic micro-structures of the Mesozoic granitic bodies in the Nanling Range, South China, existing experimental results on liqiudus and solidus temperatures of granites, zirconium saturation temperature data,geometric features of granitic bodies and their contact relationships with sedimentary rocks, it is proposed that the crystallization temperatures of zircon in this region are relatively high. The time span between the emplacement ages of granitic magmas and the zircon U-Pb ages of granites might be not very large, and possibly within the range of experimental errors of the zircon U-Pb dating. Consequently, the zircon U-Pb ages may approximately represent the emplacement ages of the corresponding granitic magmas.

Key words: Nanling Range, granite, emplacement age, zircon U-Pb age, time span