///Tiewadian pluton is located in the contact borders between Hanyin, Shiquan and Ziyang countries in the South Qinling Tectonic Belt (SQTB), Shaanxi Province, and consists chiefly of diorite, quartz diorite, quartz monzodiorite, quartz monzonite and monzogranite. The Tiewadian pluton shows comparable lithological assemblage, emplacing ages and geochemical features with felsie rocks of Hannan complex in the north margin of Yangtze Craton, indicating that they experienced similar magmatic and tectonic evolution in the similar geodynamic background, and that the Tiewadian Dluton is an important geological record relating to the Neoproterozoic subduction in the SQTB.