Characteristics and significance of ductile shear zone in Tianli, Jiangxi Province and Youxi, Zhejiang Province

The result of experiment show that 40Ar/39Ar plateau age of muscovite which is from Tianli petrofabric in Guanfeng county, Jiangxi Province is 1019 +- 0.9 Ma, and 40Ar/39Ar plateau age of biotite which is from migmatite in Youxi petrofabric Jiangshan county, Zhejiang Province is 501.2 +- 2.2 Ma, and the heat event age is 127 Ma. The research shows that they are two larger scale ductile shear zones. The 40Ar/39Ar plateau ages represent respectively the forming time of Tianli ductile shear zone and Youxi ductile shear zone. According to the age data and regional geological investigation analysis, they belong separately to the part of two tectonic units of Yangtze and south China. It also shows that Jiang-Shao tectonic zone undergoes multiphase orogeny which are Jinning, Caledonian, Indosinian and Yanshanian epoch. It is of geological significance for re-understand again the crust evolution of south China