中文摘要：

栗木锡矿的锡铌钽成矿作用与花岗岩有密切的关系，其中锡金属成矿作用与花岗岩云英岩化蚀变作用有关。通过对云英岩化花岗岩中白云母的^40Ar/^39Ar快中子活化年龄测试，获得白云母的坪年龄和等时线年龄分别为214．1±1．9Ma和214．3±4．5Ma。栗木矿田云英岩化蚀变的年龄为214Ma左右，即栗木锡矿成矿作用主要发生在214Ma左右的晚三叠世，栗木锡铌钽金属矿床是后碰撞的伸展体制下的产物。

英文摘要：

The Limu Sn - Nb - Ta deposit located in north Guangxi, South China, is composed of Laohutou, Shuiximiao and Jinzhuyuan orebodies. The Laohutou orebodies host in the greisenized granite, and the tin mineralization are closely related to greisenization hydrothermal activity. Muscovite ^40Ar/^39Ar dating is analyzed from greisenized granite at Laohutou orebodies and its plateau age and isochron age are 214. 1 ± 1.9 Ma and 214. 2 ±2.2 Ma, respectively. It is suggested that the tin mineralization occur at 214 Ma at Louhutou and form in extensional environment under post-collision geodynamic setting.